diff --git a/dbms/include/DB/AggregateFunctions/INullaryAggregateFunction.h b/dbms/include/DB/AggregateFunctions/INullaryAggregateFunction.h
index daa9ae2b8a0..1f45c28d696 100644
--- a/dbms/include/DB/AggregateFunctions/INullaryAggregateFunction.h
+++ b/dbms/include/DB/AggregateFunctions/INullaryAggregateFunction.h
@@ -16,7 +16,7 @@ public:
 	void setArguments(const DataTypes & arguments)
 	{
 		if (arguments.size() != 0)
-			throw Exception("Passed " + Poco::NumberFormatter::format(arguments.size()) + " arguments to nullary aggregate function " + this->getName(),
+			throw Exception("Passed " + toString(arguments.size()) + " arguments to nullary aggregate function " + this->getName(),
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 	}
 
diff --git a/dbms/include/DB/AggregateFunctions/IUnaryAggregateFunction.h b/dbms/include/DB/AggregateFunctions/IUnaryAggregateFunction.h
index 245e4784954..f9207b98de0 100644
--- a/dbms/include/DB/AggregateFunctions/IUnaryAggregateFunction.h
+++ b/dbms/include/DB/AggregateFunctions/IUnaryAggregateFunction.h
@@ -15,7 +15,7 @@ public:
 	void setArguments(const DataTypes & arguments)
 	{
 		if (arguments.size() != 1)
-			throw Exception("Passed " + Poco::NumberFormatter::format(arguments.size()) + " arguments to unary aggregate function " + this->getName(),
+			throw Exception("Passed " + toString(arguments.size()) + " arguments to unary aggregate function " + this->getName(),
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		setArgument(arguments[0]);
 	}
diff --git a/dbms/include/DB/Columns/ColumnVector.h b/dbms/include/DB/Columns/ColumnVector.h
index a08cbb5a0e6..1aa1bb6fbae 100644
--- a/dbms/include/DB/Columns/ColumnVector.h
+++ b/dbms/include/DB/Columns/ColumnVector.h
@@ -148,9 +148,9 @@ public:
 	{
 		if (start + length > this->data.size())
 			throw Exception("Parameters start = "
-				+ Poco::NumberFormatter::format(start) + ", length = "
-				+ Poco::NumberFormatter::format(length) + " are out of bound in IColumnVector<T>::cut() method"
-				" (data.size() = " + Poco::NumberFormatter::format(this->data.size()) + ").",
+				+ toString(start) + ", length = "
+				+ toString(length) + " are out of bound in IColumnVector<T>::cut() method"
+				" (data.size() = " + toString(this->data.size()) + ").",
 				ErrorCodes::PARAMETER_OUT_OF_BOUND);
 
 		Self * res = new Self(length);
diff --git a/dbms/include/DB/Common/Collator.h b/dbms/include/DB/Common/Collator.h
index b131842007c..a6bb90e7e51 100644
--- a/dbms/include/DB/Common/Collator.h
+++ b/dbms/include/DB/Common/Collator.h
@@ -4,11 +4,11 @@
 
 #include <DB/Core/ErrorCodes.h>
 #include <DB/Core/Exception.h>
+#include <DB/IO/WriteHelpers.h>
 
 #include <Yandex/Common.h>
 
 #include <Poco/String.h>
-#include <Poco/NumberFormatter.h>
 
 #include <boost/noncopyable.hpp>
 
@@ -42,7 +42,7 @@ public:
 		UCollationResult compare_result = ucol_strcollIter(collator, &iter1, &iter2, &status);
 		
 		if (status != U_ZERO_ERROR)
-			throw DB::Exception("ICU collation comparison failed with error code: " + Poco::NumberFormatter::format(status),
+			throw DB::Exception("ICU collation comparison failed with error code: " + DB::toString(status),
 								DB::ErrorCodes::COLLATION_COMPARISON_FAILED);
 		
 		/** Значения enum UCollationResult совпадают с нужными нам:
diff --git a/dbms/include/DB/Core/Field.h b/dbms/include/DB/Core/Field.h
index 8fec45c6dbb..f6e60dfa08c 100644
--- a/dbms/include/DB/Core/Field.h
+++ b/dbms/include/DB/Core/Field.h
@@ -5,8 +5,6 @@
 
 #include <boost/static_assert.hpp>
 
-#include <Poco/NumberFormatter.h>
-
 #include <mysqlxx/Date.h>
 #include <mysqlxx/DateTime.h>
 #include <mysqlxx/Manip.h>
diff --git a/dbms/include/DB/DataStreams/DistinctBlockInputStream.h b/dbms/include/DB/DataStreams/DistinctBlockInputStream.h
index a1d0ebb30d8..70cbb1ee4b5 100644
--- a/dbms/include/DB/DataStreams/DistinctBlockInputStream.h
+++ b/dbms/include/DB/DataStreams/DistinctBlockInputStream.h
@@ -104,10 +104,10 @@ protected:
 			{
 				if (overflow_mode == Limits::THROW)
 					throw Exception("DISTINCT-Set size limit exceeded."
-						" Rows: " + Poco::NumberFormatter::format(set.size()) +
-						", limit: " + Poco::NumberFormatter::format(max_rows) +
-						". Bytes: " + Poco::NumberFormatter::format(set.getBufferSizeInBytes()) +
-						", limit: " + Poco::NumberFormatter::format(max_bytes) + ".",
+						" Rows: " + toString(set.size()) +
+						", limit: " + toString(max_rows) +
+						". Bytes: " + toString(set.getBufferSizeInBytes()) +
+						", limit: " + toString(max_bytes) + ".",
 						ErrorCodes::SET_SIZE_LIMIT_EXCEEDED);
 
 				if (overflow_mode == Limits::BREAK)
diff --git a/dbms/include/DB/DataTypes/DataTypeFixedString.h b/dbms/include/DB/DataTypes/DataTypeFixedString.h
index 8a9b43aa2bb..3a816a643e9 100644
--- a/dbms/include/DB/DataTypes/DataTypeFixedString.h
+++ b/dbms/include/DB/DataTypes/DataTypeFixedString.h
@@ -3,7 +3,6 @@
 #include <ostream>
 
 #include <Poco/SharedPtr.h>
-#include <Poco/NumberFormatter.h>
 
 #include <DB/DataTypes/IDataType.h>
 
@@ -24,7 +23,7 @@ public:
 	
 	std::string getName() const
 	{
-		return "FixedString(" + Poco::NumberFormatter::format(n) + ")";
+		return "FixedString(" + toString(n) + ")";
 	}
 
 	DataTypePtr clone() const
diff --git a/dbms/include/DB/Functions/FunctionsArithmetic.h b/dbms/include/DB/Functions/FunctionsArithmetic.h
index 1d712eb8dc8..774ccb8ebd4 100644
--- a/dbms/include/DB/Functions/FunctionsArithmetic.h
+++ b/dbms/include/DB/Functions/FunctionsArithmetic.h
@@ -1,7 +1,5 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/DataTypes/DataTypesNumberFixed.h>
 #include <DB/Functions/IFunction.h>
 #include <DB/Functions/NumberTraits.h>
@@ -376,7 +374,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		DataTypePtr type_res;
@@ -477,7 +475,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		DataTypePtr result;
diff --git a/dbms/include/DB/Functions/FunctionsArray.h b/dbms/include/DB/Functions/FunctionsArray.h
index 85b5cd2287a..cdc02ba9aa8 100644
--- a/dbms/include/DB/Functions/FunctionsArray.h
+++ b/dbms/include/DB/Functions/FunctionsArray.h
@@ -206,7 +206,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		const DataTypeArray * array_type = dynamic_cast<const DataTypeArray *>(&*arguments[0]);
@@ -443,7 +443,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		const DataTypeArray * array_type = dynamic_cast<const DataTypeArray *>(&*arguments[0]);
diff --git a/dbms/include/DB/Functions/FunctionsCoding.h b/dbms/include/DB/Functions/FunctionsCoding.h
index 1dd0ad8ce78..6c937b28dd8 100644
--- a/dbms/include/DB/Functions/FunctionsCoding.h
+++ b/dbms/include/DB/Functions/FunctionsCoding.h
@@ -48,7 +48,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 			ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (!dynamic_cast<const DataTypeUInt32 *>(&*arguments[0]))
@@ -150,7 +150,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -238,7 +238,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]) &&
@@ -433,7 +433,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -538,7 +538,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 		if (!dynamic_cast<const DataTypeUInt8 *>(&*arguments[0]) &&
diff --git a/dbms/include/DB/Functions/FunctionsComparison.h b/dbms/include/DB/Functions/FunctionsComparison.h
index fea3e7c7351..4b45fbc4902 100644
--- a/dbms/include/DB/Functions/FunctionsComparison.h
+++ b/dbms/include/DB/Functions/FunctionsComparison.h
@@ -1,7 +1,5 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/Columns/ColumnsNumber.h>
 #include <DB/Columns/ColumnConst.h>
 #include <DB/Columns/ColumnString.h>
@@ -1314,7 +1312,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!(	(arguments[0]->isNumeric() && arguments[1]->isNumeric())
diff --git a/dbms/include/DB/Functions/FunctionsConditional.h b/dbms/include/DB/Functions/FunctionsConditional.h
index da68fd8218b..3b0af1a62ba 100644
--- a/dbms/include/DB/Functions/FunctionsConditional.h
+++ b/dbms/include/DB/Functions/FunctionsConditional.h
@@ -294,7 +294,7 @@ public:
 	{
 		if (arguments.size() != 3)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 3.",
+				+ toString(arguments.size()) + ", should be 3.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeUInt8 *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsConversion.h b/dbms/include/DB/Functions/FunctionsConversion.h
index 2f173a60581..b21cc1d5e05 100644
--- a/dbms/include/DB/Functions/FunctionsConversion.h
+++ b/dbms/include/DB/Functions/FunctionsConversion.h
@@ -276,7 +276,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new ToDataType;
diff --git a/dbms/include/DB/Functions/FunctionsDateTime.h b/dbms/include/DB/Functions/FunctionsDateTime.h
index e79a3bd921b..28a9539d95b 100644
--- a/dbms/include/DB/Functions/FunctionsDateTime.h
+++ b/dbms/include/DB/Functions/FunctionsDateTime.h
@@ -192,7 +192,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new ToDataType;
@@ -229,7 +229,7 @@ public:
 	{
 		if (arguments.size() != 0)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 0.",
+				+ toString(arguments.size()) + ", should be 0.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new DataTypeDateTime;
@@ -259,7 +259,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeDateTime *>(&*arguments[0]))
@@ -391,7 +391,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeDateTime *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsDictionaries.h b/dbms/include/DB/Functions/FunctionsDictionaries.h
index ff19c8b0e94..6ae73682f86 100644
--- a/dbms/include/DB/Functions/FunctionsDictionaries.h
+++ b/dbms/include/DB/Functions/FunctionsDictionaries.h
@@ -140,7 +140,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (arguments[0]->getName() != TypeName<T>::get())
@@ -206,7 +206,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (arguments[0]->getName() != TypeName<T>::get())
@@ -315,7 +315,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (arguments[0]->getName() != TypeName<T>::get())
@@ -440,7 +440,7 @@ public:
 	{
 		if (arguments.size() != 1 && arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1 or 2.",
+				+ toString(arguments.size()) + ", should be 1 or 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (arguments[0]->getName() != TypeName<UInt32>::get())
diff --git a/dbms/include/DB/Functions/FunctionsFormatting.h b/dbms/include/DB/Functions/FunctionsFormatting.h
index 375a4a5effe..8ba54534bb0 100644
--- a/dbms/include/DB/Functions/FunctionsFormatting.h
+++ b/dbms/include/DB/Functions/FunctionsFormatting.h
@@ -29,7 +29,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 		const IDataType * type = &*arguments[0];
diff --git a/dbms/include/DB/Functions/FunctionsHashing.h b/dbms/include/DB/Functions/FunctionsHashing.h
index 2fcc9dcd753..70d4d689acf 100644
--- a/dbms/include/DB/Functions/FunctionsHashing.h
+++ b/dbms/include/DB/Functions/FunctionsHashing.h
@@ -85,7 +85,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -172,7 +172,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!arguments[0]->isNumeric())
diff --git a/dbms/include/DB/Functions/FunctionsHigherOrder.h b/dbms/include/DB/Functions/FunctionsHigherOrder.h
index beb9dd6be6f..e97c8d61178 100644
--- a/dbms/include/DB/Functions/FunctionsHigherOrder.h
+++ b/dbms/include/DB/Functions/FunctionsHigherOrder.h
@@ -301,7 +301,7 @@ public:
 	{
 		if (arguments.size() < 1)
 			throw Exception("Function " + getName() + " needs at least one argument; passed "
-							+ Poco::NumberFormatter::format(arguments.size()) + ".",
+							+ toString(arguments.size()) + ".",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (arguments.size() == 1)
@@ -313,7 +313,7 @@ public:
 		{
 			const DataTypeArray * array_type = dynamic_cast<const DataTypeArray *>(&*arguments[i + 1]);
 			if (!array_type)
-				throw Exception("Argument " + Poco::NumberFormatter::format(i + 2) + " of function " + getName() + " must be array. Found "
+				throw Exception("Argument " + toString(i + 2) + " of function " + getName() + " must be array. Found "
 								+ arguments[i + 1]->getName() + " instead.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
 			nested_types[i] = array_type->getNestedType();
 		}
@@ -321,7 +321,7 @@ public:
 		const DataTypeExpression * expression_type = dynamic_cast<const DataTypeExpression *>(&*arguments[0]);
 		if (!expression_type || expression_type->getArgumentTypes().size() != nested_types.size())
 			throw Exception("First argument for this overload of " + getName() + " must be an expression with "
-							+ Poco::NumberFormatter::format(nested_types.size()) + " arguments. Found "
+							+ toString(nested_types.size()) + " arguments. Found "
 							+ arguments[0]->getName() + " instead.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
 		
 		arguments[0] = new DataTypeExpression(nested_types);
@@ -334,8 +334,8 @@ public:
 		size_t min_args = Impl::needExpression() ? 2 : 1;
 		if (arguments.size() < min_args)
 			throw Exception("Function " + getName() + " needs at least "
-							+ Poco::NumberFormatter::format(min_args) + " argument; passed "
-							+ Poco::NumberFormatter::format(arguments.size()) + ".",
+							+ toString(min_args) + " argument; passed "
+							+ toString(arguments.size()) + ".",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (arguments.size() == 1)
diff --git a/dbms/include/DB/Functions/FunctionsLogical.h b/dbms/include/DB/Functions/FunctionsLogical.h
index ca57f5b1bc8..0318e7cccab 100644
--- a/dbms/include/DB/Functions/FunctionsLogical.h
+++ b/dbms/include/DB/Functions/FunctionsLogical.h
@@ -1,7 +1,5 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/DataTypes/DataTypesNumberFixed.h>
 #include <DB/Functions/IFunction.h>
 
@@ -237,7 +235,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!(arguments[0]->isNumeric() && arguments[1]->isNumeric()))
@@ -314,7 +312,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!arguments[0]->isNumeric())
diff --git a/dbms/include/DB/Functions/FunctionsMiscellaneous.h b/dbms/include/DB/Functions/FunctionsMiscellaneous.h
index da940f32817..9e86b4017b3 100644
--- a/dbms/include/DB/Functions/FunctionsMiscellaneous.h
+++ b/dbms/include/DB/Functions/FunctionsMiscellaneous.h
@@ -186,7 +186,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new DataTypeUInt64;
@@ -332,7 +332,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new DataTypeString;
@@ -360,7 +360,7 @@ public:
 	{
 		if (!arguments.empty())
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 0.",
+				+ toString(arguments.size()) + ", should be 0.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new DataTypeUInt64;
@@ -389,7 +389,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (!dynamic_cast<const DataTypeFloat64 *>(&*arguments[0]) &&
@@ -455,7 +455,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return arguments[0];
@@ -492,7 +492,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function '" + getName() + "' doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new DataTypeUInt8;
@@ -687,7 +687,7 @@ class FunctionReplicate : public IFunction
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-							+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+							+ toString(arguments.size()) + ", should be 2.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		const DataTypeArray * array_type = dynamic_cast<const DataTypeArray *>(&*arguments[1]);
diff --git a/dbms/include/DB/Functions/FunctionsRandom.h b/dbms/include/DB/Functions/FunctionsRandom.h
index 6ecfe118ff4..705edaa894d 100644
--- a/dbms/include/DB/Functions/FunctionsRandom.h
+++ b/dbms/include/DB/Functions/FunctionsRandom.h
@@ -102,7 +102,7 @@ public:
 	{
 		if (arguments.size() > 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 0 or 1.",
+				+ toString(arguments.size()) + ", should be 0 or 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		return new typename DataTypeFromFieldType<typename Impl::ReturnType>::Type;
diff --git a/dbms/include/DB/Functions/FunctionsReinterpret.h b/dbms/include/DB/Functions/FunctionsReinterpret.h
index 085ab938886..c2788eb7e79 100644
--- a/dbms/include/DB/Functions/FunctionsReinterpret.h
+++ b/dbms/include/DB/Functions/FunctionsReinterpret.h
@@ -35,7 +35,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 			ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		const IDataType * type = &*arguments[0];
@@ -130,7 +130,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		const IDataType * type = &*arguments[0];
diff --git a/dbms/include/DB/Functions/FunctionsString.h b/dbms/include/DB/Functions/FunctionsString.h
index e185cca24e9..249e596bfc8 100644
--- a/dbms/include/DB/Functions/FunctionsString.h
+++ b/dbms/include/DB/Functions/FunctionsString.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
 #include <Poco/UTF8Encoding.h>
 #include <Poco/Unicode.h>
 
@@ -791,7 +790,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]) && !dynamic_cast<const DataTypeFixedString *>(&*arguments[0])
@@ -884,7 +883,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]) && !dynamic_cast<const DataTypeFixedString *>(&*arguments[0]))
@@ -942,7 +941,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]) && !dynamic_cast<const DataTypeFixedString *>(&*arguments[0]))
@@ -1074,7 +1073,7 @@ public:
 	{
 		if (arguments.size() != 3)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 3.",
+				+ toString(arguments.size()) + ", should be 3.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]) && !dynamic_cast<const DataTypeFixedString *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsStringArray.h b/dbms/include/DB/Functions/FunctionsStringArray.h
index 084056bc0f3..c295429c3c0 100644
--- a/dbms/include/DB/Functions/FunctionsStringArray.h
+++ b/dbms/include/DB/Functions/FunctionsStringArray.h
@@ -48,7 +48,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+				+ toString(arguments.size()) + ", should be 1.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -103,7 +103,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsStringSearch.h b/dbms/include/DB/Functions/FunctionsStringSearch.h
index cb68bc8c79e..e181cb7d764 100644
--- a/dbms/include/DB/Functions/FunctionsStringSearch.h
+++ b/dbms/include/DB/Functions/FunctionsStringSearch.h
@@ -372,7 +372,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-				+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+				+ toString(arguments.size()) + ", should be 2.",
 				ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -438,7 +438,7 @@ public:
 	{
 		if (arguments.size() != 2)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 2.",
+			+ toString(arguments.size()) + ", should be 2.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 		
 		if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsURL.h b/dbms/include/DB/Functions/FunctionsURL.h
index e165469df16..19d6ddb545a 100644
--- a/dbms/include/DB/Functions/FunctionsURL.h
+++ b/dbms/include/DB/Functions/FunctionsURL.h
@@ -418,7 +418,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 			if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
@@ -481,7 +481,7 @@ public:
 	{
 		if (arguments.size() != 1)
 			throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
-			+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
+			+ toString(arguments.size()) + ", should be 1.",
 							ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 			
 			if (!dynamic_cast<const DataTypeString *>(&*arguments[0]))
diff --git a/dbms/include/DB/Functions/FunctionsVisitParam.h b/dbms/include/DB/Functions/FunctionsVisitParam.h
index 20631bbe75d..a39a2c5a421 100644
--- a/dbms/include/DB/Functions/FunctionsVisitParam.h
+++ b/dbms/include/DB/Functions/FunctionsVisitParam.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
 #include <Poco/UTF8Encoding.h>
 #include <Poco/Unicode.h>
 #include <Poco/NumberParser.h>
diff --git a/dbms/include/DB/IO/ChunkedReadBuffer.h b/dbms/include/DB/IO/ChunkedReadBuffer.h
index ada46253ba1..6c57e7f8e7e 100644
--- a/dbms/include/DB/IO/ChunkedReadBuffer.h
+++ b/dbms/include/DB/IO/ChunkedReadBuffer.h
@@ -1,9 +1,7 @@
 #pragma once
 
-#include <Poco/NumberFormatter.h>
-
-#include <DB/IO/ReadBuffer.h>
 #include <DB/IO/ReadHelpers.h>
+#include <DB/IO/WriteHelpers.h>
 
 #include <iostream>
 
@@ -53,8 +51,8 @@ protected:
 
 			if (query_id != assert_query_id)
 				throw Exception("Received data for wrong query id (expected "
-					+ Poco::NumberFormatter::format(assert_query_id) + ", got "
-					+ Poco::NumberFormatter::format(query_id) + ")", ErrorCodes::RECEIVED_DATA_FOR_WRONG_QUERY_ID);
+					+ toString(assert_query_id) + ", got "
+					+ toString(query_id) + ")", ErrorCodes::RECEIVED_DATA_FOR_WRONG_QUERY_ID);
 
 			/// Флаг конца.
 			readIntBinary(all_read, in);
diff --git a/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h b/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
index 134326c7aa7..64fbc4adc1a 100644
--- a/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
+++ b/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
@@ -3,12 +3,11 @@
 #include <unistd.h>
 #include <errno.h>
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/Core/Exception.h>
 #include <DB/Core/ErrorCodes.h>
 
 #include <DB/IO/ReadBuffer.h>
+#include <DB/IO/WriteHelpers.h>
 #include <DB/IO/BufferWithOwnMemory.h>
 
 
@@ -49,7 +48,7 @@ protected:
 	/// Имя или описание файла
 	virtual std::string getFileName()
 	{
-		return "(fd = " + Poco::NumberFormatter::format(fd) + ")";
+		return "(fd = " + toString(fd) + ")";
 	}
 
 public:
diff --git a/dbms/include/DB/IO/ReadHelpers.h b/dbms/include/DB/IO/ReadHelpers.h
index 33646dbbc44..c8cb4ec8d2a 100644
--- a/dbms/include/DB/IO/ReadHelpers.h
+++ b/dbms/include/DB/IO/ReadHelpers.h
@@ -570,4 +570,21 @@ static inline const char * tryReadIntText(T & x, const char * pos, const char *
 	return pos;
 }
 
+
+/// Простые для использования методы чтения чего-либо из строки в текстовом виде.
+template <typename T>
+inline T parse(const char * data, size_t size)
+{
+	T res;
+	ReadBuffer buf(data, size, 0);
+	readText(res, buf);
+	return res;
+}
+
+template <typename T>
+inline T parse(const String & s)
+{
+	return parse<T>(s.data(), s.size());
+}
+
 }
diff --git a/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h b/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
index 8bead1cbebf..995b990ea8c 100644
--- a/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
+++ b/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
@@ -3,12 +3,11 @@
 #include <unistd.h>
 #include <errno.h>
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/Core/Exception.h>
 #include <DB/Core/ErrorCodes.h>
 
 #include <DB/IO/WriteBuffer.h>
+#include <DB/IO/WriteHelpers.h>
 #include <DB/IO/BufferWithOwnMemory.h>
 
 
@@ -43,7 +42,7 @@ protected:
 	/// Имя или описание файла
 	virtual std::string getFileName()
 	{
-		return "(fd = " + Poco::NumberFormatter::format(fd) + ")";
+		return "(fd = " + toString(fd) + ")";
 	}
 
 public:
diff --git a/dbms/include/DB/IO/WriteHelpers.h b/dbms/include/DB/IO/WriteHelpers.h
index 98db44d6517..17aea36e263 100644
--- a/dbms/include/DB/IO/WriteHelpers.h
+++ b/dbms/include/DB/IO/WriteHelpers.h
@@ -17,6 +17,7 @@
 #include <DB/IO/WriteBuffer.h>
 #include <DB/IO/WriteIntText.h>
 #include <DB/IO/VarInt.h>
+#include <DB/IO/WriteBufferFromString.h>
 
 #define WRITE_HELPERS_DEFAULT_FLOAT_PRECISION 6U
 
@@ -524,4 +525,16 @@ inline void writeDoubleQuoted(const mysqlxx::DateTime & x,	WriteBuffer & buf)
 void writeException(const Exception & e, WriteBuffer & buf);
 
 
+/// Простой для использования метод преобразования чего-либо в строку в текстовом виде.
+template <typename T>
+inline String toString(const T & x)
+{
+	String res;
+	{
+		WriteBufferFromString buf(res);
+		writeText(x, buf);
+	}
+	return res;
+}
+
 }
diff --git a/dbms/include/DB/Parsers/IAST.h b/dbms/include/DB/Parsers/IAST.h
index 5fcdedfe443..c12818a5af0 100644
--- a/dbms/include/DB/Parsers/IAST.h
+++ b/dbms/include/DB/Parsers/IAST.h
@@ -4,13 +4,13 @@
 #include <sstream>
 
 #include <Poco/SharedPtr.h>
-#include <Poco/NumberFormatter.h>
 
 #include <Yandex/Common.h>
 
 #include <DB/Core/Types.h>
 #include <DB/Core/Exception.h>
 #include <DB/Core/ErrorCodes.h>
+#include <DB/IO/WriteHelpers.h>
 #include <DB/Parsers/StringRange.h>
 
 #include <iostream>
@@ -97,7 +97,7 @@ public:
 		size_t res = 0;
 		for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
 			if (max_depth == 0 || (res = (*it)->checkDepth(max_depth - 1)) > max_depth - 1)
-				throw Exception("AST is too deep. Maximum: " + Poco::NumberFormatter::format(max_depth), ErrorCodes::TOO_DEEP_AST);
+				throw Exception("AST is too deep. Maximum: " + toString(max_depth), ErrorCodes::TOO_DEEP_AST);
 
 		return res + 1;
 	}
@@ -111,7 +111,7 @@ public:
 			res += (*it)->checkSize(max_size);
 
 		if (res > max_size)
-			throw Exception("AST is too big. Maximum: " + Poco::NumberFormatter::format(max_size), ErrorCodes::TOO_BIG_AST);
+			throw Exception("AST is too big. Maximum: " + toString(max_size), ErrorCodes::TOO_BIG_AST);
 		
 		return res;
 	}
diff --git a/dbms/include/DB/Storages/MergeTree/MergeTreeBlockInputStream.h b/dbms/include/DB/Storages/MergeTree/MergeTreeBlockInputStream.h
index 1c815268d67..6d365bece2a 100644
--- a/dbms/include/DB/Storages/MergeTree/MergeTreeBlockInputStream.h
+++ b/dbms/include/DB/Storages/MergeTree/MergeTreeBlockInputStream.h
@@ -281,8 +281,8 @@ private:
 		/// Для массивов используются отдельные потоки для размеров.
 		if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 		{
-			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
-			String escaped_size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
+			String escaped_size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 			
 			streams.insert(std::make_pair(size_name, new Stream(
 				path + escaped_size_name,
@@ -303,7 +303,7 @@ private:
 		{
 			type_arr->deserializeOffsets(
 				column,
-				streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed,
+				streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level)]->compressed,
 											max_rows_to_read);
 			
 			if (column.size())
diff --git a/dbms/include/DB/Storages/MergeTree/MergeTreeBlockOutputStream.h b/dbms/include/DB/Storages/MergeTree/MergeTreeBlockOutputStream.h
index 6063f505b41..7ec242cba9e 100644
--- a/dbms/include/DB/Storages/MergeTree/MergeTreeBlockOutputStream.h
+++ b/dbms/include/DB/Storages/MergeTree/MergeTreeBlockOutputStream.h
@@ -182,7 +182,7 @@ private:
 		/// Для массивов требуется сначала сериализовать размеры, а потом значения.
 		if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 		{
-			String size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+			String size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 			
 			WriteBufferFromFile plain(path + size_name + ".bin", DBMS_DEFAULT_BUFFER_SIZE, flags);
 			WriteBufferFromFile marks(path + size_name + ".mrk", 4096, flags);
diff --git a/dbms/include/DB/Storages/MergeTree/MergedBlockOutputStream.h b/dbms/include/DB/Storages/MergeTree/MergedBlockOutputStream.h
index bdbaa2a5af3..1cb1ae75f72 100644
--- a/dbms/include/DB/Storages/MergeTree/MergedBlockOutputStream.h
+++ b/dbms/include/DB/Storages/MergeTree/MergedBlockOutputStream.h
@@ -122,8 +122,8 @@ private:
 		/// Для массивов используются отдельные потоки для размеров.
 		if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 		{
-			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
-			String escaped_size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
+			String escaped_size_name = escaped_column_name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 			
 			column_streams[size_name] = new ColumnStream(
 				part_tmp_path + escaped_size_name + ".bin",
@@ -146,7 +146,7 @@ private:
 		/// Для массивов требуется сначала сериализовать размеры, а потом значения.
 		if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 		{
-			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+			String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 			
 			ColumnStream & stream = *column_streams[size_name];
 			
diff --git a/dbms/src/Client/Connection.cpp b/dbms/src/Client/Connection.cpp
index 19571750a4d..fc9067f25af 100644
--- a/dbms/src/Client/Connection.cpp
+++ b/dbms/src/Client/Connection.cpp
@@ -287,7 +287,7 @@ Connection::Packet Connection::receivePacket()
 			/// Закроем соединение, чтобы не было рассинхронизации.
 			disconnect();
 			throw Exception("Unknown packet "
-				+ Poco::NumberFormatter::format(res.type)
+				+ toString(res.type)
 				+ " from server " + getServerAddress(), ErrorCodes::UNKNOWN_PACKET_FROM_SERVER);
 	}
 }
diff --git a/dbms/src/Common/tests/auto_array.cpp b/dbms/src/Common/tests/auto_array.cpp
index 3ce5eef3453..fd0aff7ea76 100644
--- a/dbms/src/Common/tests/auto_array.cpp
+++ b/dbms/src/Common/tests/auto_array.cpp
@@ -2,11 +2,10 @@
 #include <iomanip>
 #include <map>
 
-#include <Poco/NumberFormatter.h>
-
 #include <DB/Core/Field.h>
 #include <DB/Interpreters/HashMap.h>
 #include <DB/Common/AutoArray.h>
+#include <DB/IO/WriteHelpers.h>
 
 #include <statdaemons/Stopwatch.h>
 
@@ -19,7 +18,7 @@ int main(int argc, char ** argv)
 		DB::AutoArray<T> arr(n);
 
 		for (size_t i = 0; i < arr.size(); ++i)
-			arr[i] = "Hello, world! " + Poco::NumberFormatter::format(i);
+			arr[i] = "Hello, world! " + DB::toString(i);
 
 		for (size_t i = 0; i < arr.size(); ++i)
 			std::cerr << arr[i] << std::endl;
@@ -33,7 +32,7 @@ int main(int argc, char ** argv)
 		DB::AutoArray<T> arr(n, DB::DontInitElemsTag());
 
 		for (size_t i = 0; i < arr.size(); ++i)
-			new (arr.place(i)) std::string("Hello, world! " + Poco::NumberFormatter::format(i));
+			new (arr.place(i)) std::string("Hello, world! " + DB::toString(i));
 
 		for (size_t i = 0; i < arr.size(); ++i)
 			std::cerr << arr[i] << std::endl;
@@ -49,7 +48,7 @@ int main(int argc, char ** argv)
 
 		arr.resize(n);
 		for (size_t i = 0; i < arr.size(); ++i)
-			arr[i] = "Hello, world! " + Poco::NumberFormatter::format(i);
+			arr[i] = "Hello, world! " + DB::toString(i);
 
 		for (size_t i = 0; i < arr.size(); ++i)
 			std::cerr << arr[i] << std::endl;
@@ -78,9 +77,9 @@ int main(int argc, char ** argv)
 		{
 			Arr key(n);
 			for (size_t j = 0; j < n; ++j)
-				key[j] = Poco::NumberFormatter::format(rand());
+				key[j] = DB::toString(rand());
 			
-			map[key] = "Hello, world! " + Poco::NumberFormatter::format(i);
+			map[key] = "Hello, world! " + DB::toString(i);
 		}
 
 		for (Map::const_iterator it = map.begin(); it != map.end(); ++it)
@@ -122,7 +121,7 @@ int main(int argc, char ** argv)
 		{
 			Arr key(n);
 			for (size_t j = 0; j < n; ++j)
-				key[j] = Poco::NumberFormatter::format(rand());
+				key[j] = DB::toString(rand());
 
 			vec.push_back(key);
 		}
@@ -221,8 +220,8 @@ int main(int argc, char ** argv)
 
 		for (size_t i = 0; i < n; ++i)
 		{
-			arr1[i] = "Hello, world! " + Poco::NumberFormatter::format(i);
-			arr2[i] = "Goodbye, world! " + Poco::NumberFormatter::format(i);
+			arr1[i] = "Hello, world! " + DB::toString(i);
+			arr2[i] = "Goodbye, world! " + DB::toString(i);
 		}
 
 		arr2 = arr1;
diff --git a/dbms/src/Core/Block.cpp b/dbms/src/Core/Block.cpp
index 03927b4c455..fff3251f017 100644
--- a/dbms/src/Core/Block.cpp
+++ b/dbms/src/Core/Block.cpp
@@ -46,7 +46,7 @@ void Block::insert(size_t position, const ColumnWithNameAndType & elem)
 {
 	if (position > index_by_position.size())
 		throw Exception("Position out of bound in Block::insert(), max position = "
-			+ Poco::NumberFormatter::format(index_by_position.size()), ErrorCodes::POSITION_OUT_OF_BOUND);
+			+ toString(index_by_position.size()), ErrorCodes::POSITION_OUT_OF_BOUND);
 
 	if (position == index_by_position.size())
 	{
@@ -79,7 +79,7 @@ void Block::erase(size_t position)
 {
 	if (position >= index_by_position.size())
 		throw Exception("Position out of bound in Block::erase(), max position = "
-			+ Poco::NumberFormatter::format(index_by_position.size()), ErrorCodes::POSITION_OUT_OF_BOUND);
+			+ toString(index_by_position.size()), ErrorCodes::POSITION_OUT_OF_BOUND);
 		
 	Container_t::iterator it = index_by_position[position];
 	index_by_name.erase(index_by_name.find(it->name));
@@ -105,9 +105,9 @@ void Block::erase(const String & name)
 ColumnWithNameAndType & Block::getByPosition(size_t position)
 {
 	if (position >= index_by_position.size())
-		throw Exception("Position " + Poco::NumberFormatter::format(position)
+		throw Exception("Position " + toString(position)
 			+ " is out of bound in Block::getByPosition(), max position = "
-			+ Poco::NumberFormatter::format(index_by_position.size() - 1)
+			+ toString(index_by_position.size() - 1)
 			+ ", there are columns: " + dumpNames(), ErrorCodes::POSITION_OUT_OF_BOUND);
 		
 	return *index_by_position[position];
@@ -117,9 +117,9 @@ ColumnWithNameAndType & Block::getByPosition(size_t position)
 const ColumnWithNameAndType & Block::getByPosition(size_t position) const
 {
 	if (position >= index_by_position.size())
-		throw Exception("Position " + Poco::NumberFormatter::format(position)
+		throw Exception("Position " + toString(position)
 			+ " is out of bound in Block::getByPosition(), max position = "
-			+ Poco::NumberFormatter::format(index_by_position.size() - 1)
+			+ toString(index_by_position.size() - 1)
 			+ ", there are columns: " + dumpNames(), ErrorCodes::POSITION_OUT_OF_BOUND);
 		
 	return *index_by_position[position];
@@ -174,8 +174,8 @@ size_t Block::rows() const
 
 		if (res != 0 && size != res)
 			throw Exception("Sizes of columns doesn't match: "
-				+ data.begin()->name + ": " + Poco::NumberFormatter::format(res)
-				+ ", " + it->name + ": " + Poco::NumberFormatter::format(size)
+				+ data.begin()->name + ": " + toString(res)
+				+ ", " + it->name + ": " + toString(size)
 				, ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
 
 		res = size;
diff --git a/dbms/src/Core/Exception.cpp b/dbms/src/Core/Exception.cpp
index a759f69c5ae..5987995cf69 100644
--- a/dbms/src/Core/Exception.cpp
+++ b/dbms/src/Core/Exception.cpp
@@ -1,7 +1,7 @@
 #include <errno.h>
 #include <string.h>
 
-#include <Poco/NumberFormatter.h>
+#include <DB/IO/WriteHelpers.h>
 
 #include <DB/Core/Exception.h>
 
@@ -48,7 +48,7 @@ void Exception::rethrow() const
 void throwFromErrno(const std::string & s, int code, int e)
 {
 	char buf[128];
-	throw Exception(s + ", errno: " + Poco::NumberFormatter::format(e) + ", strerror: " + std::string(strerror_r(e, buf, sizeof(buf))), code);
+	throw Exception(s + ", errno: " + toString(e) + ", strerror: " + std::string(strerror_r(e, buf, sizeof(buf))), code);
 }
 
 }
diff --git a/dbms/src/Core/tests/field.cpp b/dbms/src/Core/tests/field.cpp
index 18d5eb2c86f..e4cf1cb28da 100644
--- a/dbms/src/Core/tests/field.cpp
+++ b/dbms/src/Core/tests/field.cpp
@@ -3,8 +3,6 @@
 #include <sstream>
 
 #include <Poco/NumberParser.h>
-#include <Poco/NumberFormatter.h>
-
 #include <DB/Core/Field.h>
 
 #include <statdaemons/Stopwatch.h>
diff --git a/dbms/src/DataStreams/BlockInputStreamFromRowInputStream.cpp b/dbms/src/DataStreams/BlockInputStreamFromRowInputStream.cpp
index 033c0f7191a..047c98fdec4 100644
--- a/dbms/src/DataStreams/BlockInputStreamFromRowInputStream.cpp
+++ b/dbms/src/DataStreams/BlockInputStreamFromRowInputStream.cpp
@@ -48,7 +48,7 @@ Block BlockInputStreamFromRowInputStream::readImpl()
 	}
 	catch (const DB::Exception & e)
 	{
-		throw DB::Exception(e.message() + " (at row " + Poco::NumberFormatter::format(total_rows + 1) + ")", e, e.code());
+		throw DB::Exception(e.message() + " (at row " + toString(total_rows + 1) + ")", e, e.code());
 	}
 
 	return res;
diff --git a/dbms/src/DataStreams/CollapsingSortedBlockInputStream.cpp b/dbms/src/DataStreams/CollapsingSortedBlockInputStream.cpp
index ca07451fee0..5e048918ba9 100644
--- a/dbms/src/DataStreams/CollapsingSortedBlockInputStream.cpp
+++ b/dbms/src/DataStreams/CollapsingSortedBlockInputStream.cpp
@@ -126,7 +126,7 @@ void CollapsingSortedBlockInputStream::merge(Block & merged_block, ColumnPlainPt
 			++count_negative;
 		}
 		else
-			throw Exception("Incorrect data: Sign = " + Poco::NumberFormatter::format(sign) + " (must be 1 or -1).",
+			throw Exception("Incorrect data: Sign = " + toString(sign) + " (must be 1 or -1).",
 				ErrorCodes::INCORRECT_DATA);
 
 		if (!current->isLast())
diff --git a/dbms/src/DataStreams/IBlockInputStream.cpp b/dbms/src/DataStreams/IBlockInputStream.cpp
index f710b91b307..85d6a7db329 100644
--- a/dbms/src/DataStreams/IBlockInputStream.cpp
+++ b/dbms/src/DataStreams/IBlockInputStream.cpp
@@ -40,7 +40,7 @@ size_t IBlockInputStream::checkDepthImpl(size_t max_depth, size_t level) const
 		return 0;
 
 	if (level > max_depth)
-		throw Exception("Query pipeline is too deep. Maximum: " + Poco::NumberFormatter::format(max_depth), ErrorCodes::TOO_DEEP_PIPELINE);
+		throw Exception("Query pipeline is too deep. Maximum: " + toString(max_depth), ErrorCodes::TOO_DEEP_PIPELINE);
 
 	size_t res = 0;
 	for (BlockInputStreams::const_iterator it = children.begin(); it != children.end(); ++it)
diff --git a/dbms/src/DataStreams/IProfilingBlockInputStream.cpp b/dbms/src/DataStreams/IProfilingBlockInputStream.cpp
index c7073abb620..67c06827a5a 100644
--- a/dbms/src/DataStreams/IProfilingBlockInputStream.cpp
+++ b/dbms/src/DataStreams/IProfilingBlockInputStream.cpp
@@ -193,8 +193,8 @@ Block IProfilingBlockInputStream::read()
 		|| (limits.max_bytes_to_read && info.bytes > limits.max_bytes_to_read))
 	{
 		if (limits.read_overflow_mode == Limits::THROW)
-			throw Exception("Limit for rows to read exceeded: read " + Poco::NumberFormatter::format(info.rows)
-				+ " rows, maximum: " + Poco::NumberFormatter::format(limits.max_rows_to_read),
+			throw Exception("Limit for rows to read exceeded: read " + toString(info.rows)
+				+ " rows, maximum: " + toString(limits.max_rows_to_read),
 				ErrorCodes::TOO_MUCH_ROWS);
 
 		if (limits.read_overflow_mode == Limits::BREAK)
@@ -207,8 +207,8 @@ Block IProfilingBlockInputStream::read()
 		&& info.total_stopwatch.elapsed() > static_cast<UInt64>(limits.max_execution_time.totalMicroseconds()) * 1000)
 	{
 		if (limits.timeout_overflow_mode == Limits::THROW)
-			throw Exception("Timeout exceeded: elapsed " + Poco::NumberFormatter::format(info.total_stopwatch.elapsedSeconds())
-				+ " seconds, maximum: " + Poco::NumberFormatter::format(limits.max_execution_time.totalMicroseconds() / 1000000.0),
+			throw Exception("Timeout exceeded: elapsed " + toString(info.total_stopwatch.elapsedSeconds())
+				+ " seconds, maximum: " + toString(limits.max_execution_time.totalMicroseconds() / 1000000.0),
 			ErrorCodes::TIMEOUT_EXCEEDED);
 
 		if (limits.timeout_overflow_mode == Limits::BREAK)
@@ -221,8 +221,8 @@ Block IProfilingBlockInputStream::read()
 		&& info.total_stopwatch.elapsed() > static_cast<UInt64>(limits.timeout_before_checking_execution_speed.totalMicroseconds()) * 1000
 		&& info.rows / info.total_stopwatch.elapsedSeconds() < limits.min_execution_speed)
 	{
-		throw Exception("Query is executing too slow: " + Poco::NumberFormatter::format(info.rows / info.total_stopwatch.elapsedSeconds())
-			+ " rows/sec., minimum: " + Poco::NumberFormatter::format(limits.min_execution_speed),
+		throw Exception("Query is executing too slow: " + toString(info.rows / info.total_stopwatch.elapsedSeconds())
+			+ " rows/sec., minimum: " + toString(limits.min_execution_speed),
 			ErrorCodes::TOO_SLOW);
 	}
 	
diff --git a/dbms/src/IO/tests/parse_int_perf.cpp b/dbms/src/IO/tests/parse_int_perf.cpp
index 9107d0fd256..ee90565e755 100644
--- a/dbms/src/IO/tests/parse_int_perf.cpp
+++ b/dbms/src/IO/tests/parse_int_perf.cpp
@@ -9,6 +9,7 @@
 
 #include <DB/IO/ReadHelpers.h>
 #include <DB/IO/WriteHelpers.h>
+#include <DB/IO/WriteIntText.h>
 #include <DB/IO/WriteBufferFromVector.h>
 #include <DB/IO/WriteBufferFromString.h>
 #include <DB/IO/CompressedWriteBuffer.h>
@@ -1141,12 +1142,12 @@ int main(int argc, char ** argv)
 {
 /*	std::string s(' ', 20);
 	DB::WriteBufferFromString wb(s);
-	::writeIntText(Poco::NumberParser::parseUnsigned64(std::string(argv[1])), wb);
+	DB::Faster::writeIntText(Poco::NumberParser::parseUnsigned64(std::string(argv[1])), wb);
 	std::cerr << s << std::endl;*/
 	
 	try
 	{
-		typedef Int64 T;
+		typedef UInt8 T;
 		
 		size_t n = atoi(argv[1]);
 		std::vector<T> data(n);
@@ -1156,7 +1157,7 @@ int main(int argc, char ** argv)
 			Stopwatch watch;
 
 			for (size_t i = 0; i < n; ++i)
-				data[i] = lrand48() ^ (lrand48() << 24) ^ (lrand48() << 48);
+				data[i] = lrand48();// / lrand48();// ^ (lrand48() << 24) ^ (lrand48() << 48);
 
 			watch.stop();
 			std::cerr << std::fixed << std::setprecision(2)
@@ -1178,7 +1179,9 @@ int main(int argc, char ** argv)
 
 			for (size_t i = 0; i < n; ++i)
 			{
-				writeIntTextTable(data[i], wb);
+				//writeIntTextTable(data[i], wb);
+				DB::writeIntText(data[i], wb);
+				//DB::writeIntText(data[i], wb);
 				DB::writeChar('\t', wb);
 			}
 
diff --git a/dbms/src/Interpreters/Aggregator.cpp b/dbms/src/Interpreters/Aggregator.cpp
index 645e82d5fad..3d0d8f26178 100644
--- a/dbms/src/Interpreters/Aggregator.cpp
+++ b/dbms/src/Interpreters/Aggregator.cpp
@@ -462,8 +462,8 @@ void Aggregator::execute(BlockInputStreamPtr stream, AggregatedDataVariants & re
 		if (!no_more_keys && max_rows_to_group_by && result.size() > max_rows_to_group_by)
 		{
 			if (group_by_overflow_mode == Limits::THROW)
-				throw Exception("Limit for rows to GROUP BY exceeded: has " + Poco::NumberFormatter::format(result.size())
-					+ " rows, maximum: " + Poco::NumberFormatter::format(max_rows_to_group_by),
+				throw Exception("Limit for rows to GROUP BY exceeded: has " + toString(result.size())
+					+ " rows, maximum: " + toString(max_rows_to_group_by),
 					ErrorCodes::TOO_MUCH_ROWS);
 			else if (group_by_overflow_mode == Limits::BREAK)
 				break;
diff --git a/dbms/src/Interpreters/Context.cpp b/dbms/src/Interpreters/Context.cpp
index 130844a01e2..3a0da59d062 100644
--- a/dbms/src/Interpreters/Context.cpp
+++ b/dbms/src/Interpreters/Context.cpp
@@ -222,7 +222,7 @@ ASTPtr Context::getCreateQuery(const String & database_name, const String & tabl
 	/// Распарсенный запрос должен заканчиваться на конец входных данных или на точку с запятой.
 	if (!parse_res || (pos != end && *pos != ';'))
 		throw DB::Exception("Syntax error while parsing query from file " + metadata_path + ": failed at position "
-			+ Poco::NumberFormatter::format(pos - begin) + ": "
+			+ toString(pos - begin) + ": "
 			+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 			+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 			DB::ErrorCodes::SYNTAX_ERROR);
diff --git a/dbms/src/Interpreters/ExpressionActions.cpp b/dbms/src/Interpreters/ExpressionActions.cpp
index 28cb65133c9..97bb924952a 100644
--- a/dbms/src/Interpreters/ExpressionActions.cpp
+++ b/dbms/src/Interpreters/ExpressionActions.cpp
@@ -320,7 +320,7 @@ void ExpressionActions::checkLimits(Block & block) const
 	const Limits & limits = settings.limits;
 	if (limits.max_temporary_columns && block.columns() > limits.max_temporary_columns)
 		throw Exception("Too many temporary columns: " + block.dumpNames()
-		+ ". Maximum: " + Poco::NumberFormatter::format(limits.max_temporary_columns),
+		+ ". Maximum: " + toString(limits.max_temporary_columns),
 						ErrorCodes::TOO_MUCH_TEMPORARY_COLUMNS);
 	
 	size_t non_const_columns = 0;
@@ -336,7 +336,7 @@ void ExpressionActions::checkLimits(Block & block) const
 				list_of_non_const_columns << (i == 0 ? "" : ", ") << block.getByPosition(i).name;
 			
 			throw Exception("Too many temporary non-const columns: " + list_of_non_const_columns.str()
-			+ ". Maximum: " + Poco::NumberFormatter::format(limits.max_temporary_non_const_columns),
+			+ ". Maximum: " + toString(limits.max_temporary_non_const_columns),
 							ErrorCodes::TOO_MUCH_TEMPORARY_NON_CONST_COLUMNS);
 	}
 }
diff --git a/dbms/src/Interpreters/ExpressionAnalyzer.cpp b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
index 164031a2874..19935d8e755 100644
--- a/dbms/src/Interpreters/ExpressionAnalyzer.cpp
+++ b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
@@ -476,9 +476,9 @@ void ExpressionAnalyzer::makeSet(ASTFunction * node, const Block & sample_block)
 static std::string getUniqueName(const Block & block, const std::string & prefix)
 {
 	int i = 1;
-	while (block.has(prefix + Poco::NumberFormatter::format(i)))
+	while (block.has(prefix + toString(i)))
 		++i;
-	return prefix + Poco::NumberFormatter::format(i);
+	return prefix + toString(i);
 }
 
 
diff --git a/dbms/src/Interpreters/InterpreterRenameQuery.cpp b/dbms/src/Interpreters/InterpreterRenameQuery.cpp
index 2a9f53ec403..c6e90ea0b8d 100644
--- a/dbms/src/Interpreters/InterpreterRenameQuery.cpp
+++ b/dbms/src/Interpreters/InterpreterRenameQuery.cpp
@@ -78,7 +78,7 @@ void InterpreterRenameQuery::execute()
 			/// Распарсенный запрос должен заканчиваться на конец входных данных или на точку с запятой.
 			if (!parse_res || (pos != end && *pos != ';'))
 				throw Exception("Syntax error in file " + from_metadata_path + ": failed at position "
-					+ Poco::NumberFormatter::format(pos - create_query.data()) + ": "
+					+ toString(pos - create_query.data()) + ": "
 					+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 					+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 					ErrorCodes::SYNTAX_ERROR);
diff --git a/dbms/src/Interpreters/InterpreterSelectQuery.cpp b/dbms/src/Interpreters/InterpreterSelectQuery.cpp
index a3262214685..cdb81bf3991 100644
--- a/dbms/src/Interpreters/InterpreterSelectQuery.cpp
+++ b/dbms/src/Interpreters/InterpreterSelectQuery.cpp
@@ -34,7 +34,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(ASTPtr query_ptr_, const Context
 	log(&Logger::get("InterpreterSelectQuery"))
 {
 	if (settings.limits.max_subquery_depth && subquery_depth > settings.limits.max_subquery_depth)
-		throw Exception("Too deep subqueries. Maximum: " + Poco::NumberFormatter::format(settings.limits.max_subquery_depth),
+		throw Exception("Too deep subqueries. Maximum: " + toString(settings.limits.max_subquery_depth),
 			ErrorCodes::TOO_DEEP_SUBQUERIES);
 	
 	context.setColumns(!query.table || !dynamic_cast<ASTSelectQuery *>(&*query.table)
@@ -358,8 +358,8 @@ QueryProcessingStage::Enum InterpreterSelectQuery::executeFetchColumns(BlockInpu
 	/// Ограничение на количество столбцов для чтения.
 	if (settings.limits.max_columns_to_read && required_columns.size() > settings.limits.max_columns_to_read)
 		throw Exception("Limit for number of columns to read exceeded. "
-			"Requested: " + Poco::NumberFormatter::format(required_columns.size())
-			+ ", maximum: " + Poco::NumberFormatter::format(settings.limits.max_columns_to_read),
+			"Requested: " + toString(required_columns.size())
+			+ ", maximum: " + toString(settings.limits.max_columns_to_read),
 			ErrorCodes::TOO_MUCH_COLUMNS);
 
 	size_t limit_length = 0;
diff --git a/dbms/src/Interpreters/Set.cpp b/dbms/src/Interpreters/Set.cpp
index 406ee051aa7..ee870fa2761 100644
--- a/dbms/src/Interpreters/Set.cpp
+++ b/dbms/src/Interpreters/Set.cpp
@@ -213,10 +213,10 @@ void Set::create(BlockInputStreamPtr stream)
 		{
 			if (overflow_mode == Limits::THROW)
 					throw Exception("IN-Set size exceeded."
-						" Rows: " + Poco::NumberFormatter::format(getTotalRowCount()) +
-						", limit: " + Poco::NumberFormatter::format(max_rows) +
-						". Bytes: " + Poco::NumberFormatter::format(getTotalByteCount()) +
-						", limit: " + Poco::NumberFormatter::format(max_bytes) + ".",
+						" Rows: " + toString(getTotalRowCount()) +
+						", limit: " + toString(max_rows) +
+						". Bytes: " + toString(getTotalByteCount()) +
+						", limit: " + toString(max_bytes) + ".",
 						ErrorCodes::SET_SIZE_LIMIT_EXCEEDED);
 
 			if (overflow_mode == Limits::BREAK)
@@ -267,7 +267,7 @@ void Set::create(DataTypes & types, ASTPtr node)
 		ColumnWithNameAndType col;
 		col.type = data_types[i];
 		col.column = data_types[i]->createColumn();
-		col.name = "_" + Poco::NumberFormatter::format(i);
+		col.name = "_" + toString(i);
 
 		block.insert(col);
 	}
@@ -353,7 +353,7 @@ void Set::execute(Block & block, const ColumnNumbers & arguments, size_t result,
 			key_columns[i] = block.getByPosition(arguments[i]).column;
 			
 			if (data_types[i]->getName() != block.getByPosition(arguments[i]).type->getName())
-				throw Exception("Types of column " + Poco::NumberFormatter::format(i + 1) + " in section IN don't match: " + data_types[i]->getName() + " on the right, " + block.getByPosition(arguments[i]).type->getName() + " on the left.", ErrorCodes::TYPE_MISMATCH);
+				throw Exception("Types of column " + toString(i + 1) + " in section IN don't match: " + data_types[i]->getName() + " on the right, " + block.getByPosition(arguments[i]).type->getName() + " on the left.", ErrorCodes::TYPE_MISMATCH);
 		}
 		
 		executeOrdinary(key_columns, vec_res, negative);
diff --git a/dbms/src/Interpreters/executeQuery.cpp b/dbms/src/Interpreters/executeQuery.cpp
index 6674a2c7c23..20a199785b4 100644
--- a/dbms/src/Interpreters/executeQuery.cpp
+++ b/dbms/src/Interpreters/executeQuery.cpp
@@ -61,7 +61,7 @@ void executeQuery(
 	/// Распарсенный запрос должен заканчиваться на конец входных данных или на точку с запятой.
 	if (!parse_res || (pos != end && *pos != ';'))
 		throw Exception("Syntax error: failed at position "
-			+ Poco::NumberFormatter::format(pos - begin) + ": "
+			+ toString(pos - begin) + ": "
 			+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 			+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 			ErrorCodes::SYNTAX_ERROR);
@@ -97,7 +97,7 @@ BlockIO executeQuery(
 	/// Распарсенный запрос должен заканчиваться на конец входных данных или на точку с запятой.
 	if (!parse_res || (pos != end && *pos != ';'))
 		throw Exception("Syntax error: failed at position "
-			+ Poco::NumberFormatter::format(pos - begin) + ": "
+			+ toString(pos - begin) + ": "
 			+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 			+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 			ErrorCodes::SYNTAX_ERROR);
diff --git a/dbms/src/Interpreters/loadMetadata.cpp b/dbms/src/Interpreters/loadMetadata.cpp
index ab6f6d66a73..fd71b81c38f 100644
--- a/dbms/src/Interpreters/loadMetadata.cpp
+++ b/dbms/src/Interpreters/loadMetadata.cpp
@@ -34,7 +34,7 @@ static void executeCreateQuery(const String & query, Context & context, const St
 	/// Распарсенный запрос должен заканчиваться на конец входных данных или на точку с запятой.
 	if (!parse_res || (pos != end && *pos != ';'))
 		throw DB::Exception("Syntax error while executing query from file " + file_name + ": failed at position "
-			+ Poco::NumberFormatter::format(pos - begin) + ": "
+			+ toString(pos - begin) + ": "
 			+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 			+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 			DB::ErrorCodes::SYNTAX_ERROR);
diff --git a/dbms/src/Parsers/formatAST.cpp b/dbms/src/Parsers/formatAST.cpp
index 8831d74b0b2..76c877d00e4 100644
--- a/dbms/src/Parsers/formatAST.cpp
+++ b/dbms/src/Parsers/formatAST.cpp
@@ -2,8 +2,6 @@
 
 #include <boost/variant/static_visitor.hpp>
 
-#include <Poco/NumberFormatter.h>
-
 #include <mysqlxx/Manip.h>
 
 #include <DB/IO/WriteBufferFromOStream.h>
diff --git a/dbms/src/Server/OLAPQueryConverter.cpp b/dbms/src/Server/OLAPQueryConverter.cpp
index 34ecf8d788f..b6124e40700 100644
--- a/dbms/src/Server/OLAPQueryConverter.cpp
+++ b/dbms/src/Server/OLAPQueryConverter.cpp
@@ -1,7 +1,6 @@
 #include "OLAPQueryConverter.h"
 #include <DB/IO/WriteHelpers.h>
 #include <DB/IO/WriteBufferFromString.h>
-#include <Poco/NumberFormatter.h>
 
 
 namespace DB
@@ -149,7 +148,7 @@ void QueryConverter::OLAPServerQueryToClickhouse(const QueryParseResult & query,
 	
 	/// Ограничение на количество выводимых строк.
 	if (query.limit != 0)
-		out_query += " LIMIT " + Poco::NumberFormatter::format(query.limit);
+		out_query += " LIMIT " + toString(query.limit);
 }
 
 std::string QueryConverter::convertAttributeFormatted(const std::string & attribute, unsigned parameter)
@@ -257,7 +256,7 @@ std::string QueryConverter::convertConstant(const std::string & attribute, const
 {
 	if (!attribute_metadatas.count(attribute))
 		throw Exception("Unknown attribute " + attribute, ErrorCodes::UNKNOWN_IDENTIFIER);
-	return Poco::NumberFormatter::format(attribute_metadatas[attribute]->parse(value));
+	return toString(attribute_metadatas[attribute]->parse(value));
 }
 
 std::string QueryConverter::convertCondition(const std::string & attribute, unsigned parameter, const std::string & name, const std::string & rhs)
@@ -327,7 +326,7 @@ std::string QueryConverter::convertDateRange(time_t date_first, time_t date_last
 
 std::string QueryConverter::convertCounterID(Yandex::CounterID_t CounterID)
 {
-	return "CounterID == " + Poco::NumberFormatter::format(CounterID);
+	return "CounterID == " + toString(CounterID);
 }
 
 std::string QueryConverter::getTableName(Yandex::CounterID_t CounterID)
diff --git a/dbms/src/Storages/StorageChunkMerger.cpp b/dbms/src/Storages/StorageChunkMerger.cpp
index 74bca298f78..57c42654ee8 100644
--- a/dbms/src/Storages/StorageChunkMerger.cpp
+++ b/dbms/src/Storages/StorageChunkMerger.cpp
@@ -356,7 +356,7 @@ bool StorageChunkMerger::mergeChunks(const Storages & chunks)
 			if (!parse_res || pos != end)
 				throw DB::Exception("Syntax error while parsing create query made by ChunkMerger."
 					" The query is \"" + create_query + "\"."
-					+ " Failed at position " + Poco::NumberFormatter::format(pos - begin) + ": "
+					+ " Failed at position " + toString(pos - begin) + ": "
 					+ std::string(pos, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, end - pos))
 					+ ", expected " + (parse_res ? "end of query" : expected) + ".",
 					DB::ErrorCodes::LOGICAL_ERROR);
diff --git a/dbms/src/Storages/StorageLog.cpp b/dbms/src/Storages/StorageLog.cpp
index 2e0b594e5db..a930085ede4 100644
--- a/dbms/src/Storages/StorageLog.cpp
+++ b/dbms/src/Storages/StorageLog.cpp
@@ -85,7 +85,7 @@ void LogBlockInputStream::addStream(const String & name, const IDataType & type,
 	/// Для массивов используются отдельные потоки для размеров.
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 		streams.insert(std::make_pair(size_name, new Stream(
 			storage.files[size_name].data_file.path(),
 			mark_number
@@ -110,7 +110,7 @@ void LogBlockInputStream::readData(const String & name, const IDataType & type,
 	{
 		type_arr->deserializeOffsets(
 			column,
-			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed,
+			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level)]->compressed,
 			max_rows_to_read);
 
 		if (column.size())
@@ -155,7 +155,7 @@ void LogBlockOutputStream::addStream(const String & name, const IDataType & type
 	/// Для массивов используются отдельные потоки для размеров.
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 		streams.insert(std::make_pair(size_name, new Stream(
 			storage.files[size_name].data_file.path())));
 
@@ -172,7 +172,7 @@ void LogBlockOutputStream::writeData(const String & name, const IDataType & type
 	/// Для массивов требуется сначала сериализовать размеры, а потом значения.
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 
 		Mark mark;
 		mark.rows = (storage.files[size_name].marks.empty() ? 0 : storage.files[size_name].marks.back().rows) + column.size();
@@ -254,7 +254,7 @@ void StorageLog::addFile(const String & column_name, const IDataType & type, siz
 
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_column_suffix = ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_column_suffix = ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 
 		ColumnData & column_data = files.insert(std::make_pair(column_name + size_column_suffix, ColumnData())).first->second;
 		column_data.column_index = column_names.size();
diff --git a/dbms/src/Storages/StorageTinyLog.cpp b/dbms/src/Storages/StorageTinyLog.cpp
index 4d2983cfe34..c96a2effb6f 100644
--- a/dbms/src/Storages/StorageTinyLog.cpp
+++ b/dbms/src/Storages/StorageTinyLog.cpp
@@ -78,7 +78,7 @@ void TinyLogBlockInputStream::addStream(const String & name, const IDataType & t
 	/// Для массивов используются отдельные потоки для размеров.
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 		streams.insert(std::make_pair(size_name, new Stream(storage.files[size_name].data_file.path())));
 
 		addStream(name, *type_arr->getNestedType(), level + 1);
@@ -95,7 +95,7 @@ void TinyLogBlockInputStream::readData(const String & name, const IDataType & ty
 	{
 		type_arr->deserializeOffsets(
 			column,
-			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed,
+			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level)]->compressed,
 			limit);
 
 		if (column.size())
@@ -126,7 +126,7 @@ void TinyLogBlockOutputStream::addStream(const String & name, const IDataType &
 	/// Для массивов используются отдельные потоки для размеров.
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 		streams.insert(std::make_pair(size_name, new Stream(storage.files[size_name].data_file.path())));
 		
 		addStream(name, *type_arr->getNestedType(), level + 1);
@@ -143,7 +143,7 @@ void TinyLogBlockOutputStream::writeData(const String & name, const IDataType &
 	{
 		type_arr->serializeOffsets(
 			column,
-			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed);
+			streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level)]->compressed);
 		
 		writeData(name, *type_arr->getNestedType(), dynamic_cast<const ColumnArray &>(column).getData(), level + 1);
 	}
@@ -196,7 +196,7 @@ void StorageTinyLog::addFile(const String & column_name, const IDataType & type,
 
 	if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
 	{
-		String size_column_suffix = ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
+		String size_column_suffix = ARRAY_SIZES_COLUMN_NAME_SUFFIX + toString(level);
 
 		ColumnData column_data;
 		files.insert(std::make_pair(column_name + size_column_suffix, column_data));