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69 lines
1.3 KiB
C++
69 lines
1.3 KiB
C++
#pragma once
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#include <DB/Interpreters/SystemLog.h>
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namespace DB
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{
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/** Allows to log information about queries execution:
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* - info about start of query execution;
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* - performance metrics (are set at the end of query execution);
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* - info about errors of query execution.
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*/
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/// A struct which will be inserted as row into query_log table
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struct QueryLogElement
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{
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enum Type
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{
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QUERY_START = 1,
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QUERY_FINISH = 2,
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EXCEPTION_BEFORE_START = 3,
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EXCEPTION_WHILE_PROCESSING = 4,
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};
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Type type = QUERY_START;
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/// Depending on the type of query and type of stage, not all the fields may be filled.
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time_t event_time{};
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time_t query_start_time{};
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UInt64 query_duration_ms{};
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UInt64 read_rows{};
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UInt64 read_bytes{};
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UInt64 written_rows{};
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UInt64 written_bytes{};
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/// NOTE: Not obvious metric.
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/// It always approximately equal to read_rows or written_rows at the end of query execution.
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UInt64 result_rows{};
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UInt64 result_bytes{};
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UInt64 memory_usage{};
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String query;
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String exception;
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String stack_trace;
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ClientInfo client_info;
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static std::string name() { return "QueryLog"; }
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static Block createBlock();
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void appendToBlock(Block & block) const;
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};
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/// Instead of typedef - to allow forward declaration.
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class QueryLog : public SystemLog<QueryLogElement>
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{
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using SystemLog<QueryLogElement>::SystemLog;
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};
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}
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