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cd14f9ebcb
* split up select.md * array-join.md basic refactoring * distinct.md basic refactoring * format.md basic refactoring * from.md basic refactoring * group-by.md basic refactoring * having.md basic refactoring * additional index.md refactoring * into-outfile.md basic refactoring * join.md basic refactoring * limit.md basic refactoring * limit-by.md basic refactoring * order-by.md basic refactoring * prewhere.md basic refactoring * adjust operators/index.md links * adjust sample.md links * adjust more links * adjust operatots links * fix some links * adjust aggregate function article titles * basic refactor of remaining select clauses * absolute paths in make_links.sh * run make_links.sh * remove old select.md locations * translate docs/es * translate docs/fr * translate docs/fa * remove old operators.md location * change operators.md links * adjust links in docs/es * adjust links in docs/es * minor texts adjustments * wip * update machine translations to use new links * fix changelog * es build fixes * get rid of some select.md links * temporary adjust ru links * temporary adjust more ru links * improve curly brace handling * adjust ru as well * fa build fix * ru link fixes * zh link fixes * temporary disable part of anchor checks
311 lines
11 KiB
Markdown
311 lines
11 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_priority: 65
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toc_title: "\u81EA\u7701"
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---
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# 内省功能 {#introspection-functions}
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您可以使用本章中描述的函数来反省 [ELF](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) 和 [DWARF](https://en.wikipedia.org/wiki/DWARF) 用于查询分析。
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!!! warning "警告"
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这些功能很慢，可能会强加安全考虑。
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对于内省功能的正确操作:
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- 安装 `clickhouse-common-static-dbg` 包。
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- 设置 [allow\_introspection\_functions](../../operations/settings/settings.md#settings-allow_introspection_functions) 设置为1。
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For security reasons introspection functions are disabled by default.
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ClickHouse将探查器报告保存到 [trace\_log](../../operations/system-tables.md#system_tables-trace_log) 系统表. 确保正确配置了表和探查器。
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## addressToLine {#addresstoline}
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将ClickHouse服务器进程内的虚拟内存地址转换为ClickHouse源代码中的文件名和行号。
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如果您使用官方的ClickHouse软件包，您需要安装 `clickhouse-common-static-dbg` 包。
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**语法**
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``` sql
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addressToLine(address_of_binary_instruction)
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```
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**参数**
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- `address_of_binary_instruction` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Address of instruction in a running process.
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**返回值**
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- 源代码文件名和此文件中用冒号分隔的行号。
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For example, `/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199`, where `199` is a line number.
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- 二进制文件的名称，如果函数找不到调试信息。
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- 空字符串，如果地址无效。
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类型: [字符串](../../sql-reference/data-types/string.md).
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**示例**
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启用内省功能:
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``` sql
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SET allow_introspection_functions=1
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```
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从中选择第一个字符串 `trace_log` 系统表:
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``` sql
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SELECT * FROM system.trace_log LIMIT 1 \G
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```
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``` text
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Row 1:
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──────
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event_date: 2019-11-19
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event_time: 2019-11-19 18:57:23
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revision: 54429
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timer_type: Real
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thread_number: 48
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query_id: 421b6855-1858-45a5-8f37-f383409d6d72
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trace: [140658411141617,94784174532828,94784076370703,94784076372094,94784076361020,94784175007680,140658411116251,140658403895439]
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```
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该 `trace` 字段包含采样时的堆栈跟踪。
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获取单个地址的源代码文件名和行号:
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``` sql
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SELECT addressToLine(94784076370703) \G
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```
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``` text
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Row 1:
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──────
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addressToLine(94784076370703): /build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199
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```
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将函数应用于整个堆栈跟踪:
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``` sql
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SELECT
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arrayStringConcat(arrayMap(x -> addressToLine(x), trace), '\n') AS trace_source_code_lines
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FROM system.trace_log
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LIMIT 1
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\G
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```
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该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `addressToLine` 功能。 这种处理的结果，你在看 `trace_source_code_lines` 列的输出。
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``` text
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Row 1:
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──────
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trace_source_code_lines: /lib/x86_64-linux-gnu/libpthread-2.27.so
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/usr/lib/debug/usr/bin/clickhouse
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/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199
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/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.h:155
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/usr/include/c++/9/bits/atomic_base.h:551
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/usr/lib/debug/usr/bin/clickhouse
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/lib/x86_64-linux-gnu/libpthread-2.27.so
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/build/glibc-OTsEL5/glibc-2.27/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:97
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```
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## addressToSymbol {#addresstosymbol}
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将ClickHouse服务器进程内的虚拟内存地址转换为ClickHouse对象文件中的符号。
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**语法**
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``` sql
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addressToSymbol(address_of_binary_instruction)
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```
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**参数**
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- `address_of_binary_instruction` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Address of instruction in a running process.
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**返回值**
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- 来自ClickHouse对象文件的符号。
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- 空字符串，如果地址无效。
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类型: [字符串](../../sql-reference/data-types/string.md).
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**示例**
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启用内省功能:
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``` sql
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SET allow_introspection_functions=1
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```
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从中选择第一个字符串 `trace_log` 系统表:
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``` sql
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SELECT * FROM system.trace_log LIMIT 1 \G
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```
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``` text
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Row 1:
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──────
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event_date: 2019-11-20
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event_time: 2019-11-20 16:57:59
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revision: 54429
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timer_type: Real
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thread_number: 48
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query_id: 724028bf-f550-45aa-910d-2af6212b94ac
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trace: [94138803686098,94138815010911,94138815096522,94138815101224,94138815102091,94138814222988,94138806823642,94138814457211,94138806823642,94138814457211,94138806823642,94138806795179,94138806796144,94138753770094,94138753771646,94138753760572,94138852407232,140399185266395,140399178045583]
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```
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该 `trace` 字段包含采样时的堆栈跟踪。
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获取单个地址的符号:
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``` sql
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SELECT addressToSymbol(94138803686098) \G
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```
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``` text
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Row 1:
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──────
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addressToSymbol(94138803686098): _ZNK2DB24IAggregateFunctionHelperINS_20AggregateFunctionSumImmNS_24AggregateFunctionSumDataImEEEEE19addBatchSinglePlaceEmPcPPKNS_7IColumnEPNS_5ArenaE
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```
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将函数应用于整个堆栈跟踪:
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``` sql
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SELECT
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arrayStringConcat(arrayMap(x -> addressToSymbol(x), trace), '\n') AS trace_symbols
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FROM system.trace_log
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LIMIT 1
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\G
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```
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该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `addressToSymbols` 功能。 这种处理的结果，你在看 `trace_symbols` 列的输出。
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``` text
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Row 1:
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──────
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trace_symbols: _ZNK2DB24IAggregateFunctionHelperINS_20AggregateFunctionSumImmNS_24AggregateFunctionSumDataImEEEEE19addBatchSinglePlaceEmPcPPKNS_7IColumnEPNS_5ArenaE
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_ZNK2DB10Aggregator21executeWithoutKeyImplERPcmPNS0_28AggregateFunctionInstructionEPNS_5ArenaE
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_ZN2DB10Aggregator14executeOnBlockESt6vectorIN3COWINS_7IColumnEE13immutable_ptrIS3_EESaIS6_EEmRNS_22AggregatedDataVariantsERS1_IPKS3_SaISC_EERS1_ISE_SaISE_EERb
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_ZN2DB10Aggregator14executeOnBlockERKNS_5BlockERNS_22AggregatedDataVariantsERSt6vectorIPKNS_7IColumnESaIS9_EERS6_ISB_SaISB_EERb
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_ZN2DB10Aggregator7executeERKSt10shared_ptrINS_17IBlockInputStreamEERNS_22AggregatedDataVariantsE
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_ZN2DB27AggregatingBlockInputStream8readImplEv
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_ZN2DB17IBlockInputStream4readEv
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_ZN2DB26ExpressionBlockInputStream8readImplEv
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_ZN2DB17IBlockInputStream4readEv
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_ZN2DB26ExpressionBlockInputStream8readImplEv
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_ZN2DB17IBlockInputStream4readEv
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_ZN2DB28AsynchronousBlockInputStream9calculateEv
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_ZNSt17_Function_handlerIFvvEZN2DB28AsynchronousBlockInputStream4nextEvEUlvE_E9_M_invokeERKSt9_Any_data
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_ZN14ThreadPoolImplI20ThreadFromGlobalPoolE6workerESt14_List_iteratorIS0_E
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_ZZN20ThreadFromGlobalPoolC4IZN14ThreadPoolImplIS_E12scheduleImplIvEET_St8functionIFvvEEiSt8optionalImEEUlvE1_JEEEOS4_DpOT0_ENKUlvE_clEv
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_ZN14ThreadPoolImplISt6threadE6workerESt14_List_iteratorIS0_E
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execute_native_thread_routine
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start_thread
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clone
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```
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## demangle {#demangle}
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转换一个符号，您可以使用 [addressToSymbol](#addresstosymbol) 函数到C++函数名。
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**语法**
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``` sql
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demangle(symbol)
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```
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**参数**
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- `symbol` ([字符串](../../sql-reference/data-types/string.md)) — Symbol from an object file.
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**返回值**
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- C++函数的名称。
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- 如果符号无效，则为空字符串。
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类型: [字符串](../../sql-reference/data-types/string.md).
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**示例**
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启用内省功能:
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``` sql
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SET allow_introspection_functions=1
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```
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从中选择第一个字符串 `trace_log` 系统表:
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``` sql
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SELECT * FROM system.trace_log LIMIT 1 \G
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```
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``` text
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Row 1:
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──────
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event_date: 2019-11-20
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event_time: 2019-11-20 16:57:59
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revision: 54429
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timer_type: Real
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thread_number: 48
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query_id: 724028bf-f550-45aa-910d-2af6212b94ac
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trace: [94138803686098,94138815010911,94138815096522,94138815101224,94138815102091,94138814222988,94138806823642,94138814457211,94138806823642,94138814457211,94138806823642,94138806795179,94138806796144,94138753770094,94138753771646,94138753760572,94138852407232,140399185266395,140399178045583]
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```
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该 `trace` 字段包含采样时的堆栈跟踪。
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获取单个地址的函数名称:
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``` sql
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SELECT demangle(addressToSymbol(94138803686098)) \G
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```
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``` text
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Row 1:
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──────
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demangle(addressToSymbol(94138803686098)): DB::IAggregateFunctionHelper<DB::AggregateFunctionSum<unsigned long, unsigned long, DB::AggregateFunctionSumData<unsigned long> > >::addBatchSinglePlace(unsigned long, char*, DB::IColumn const**, DB::Arena*) const
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```
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将函数应用于整个堆栈跟踪:
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``` sql
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SELECT
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arrayStringConcat(arrayMap(x -> demangle(addressToSymbol(x)), trace), '\n') AS trace_functions
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FROM system.trace_log
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LIMIT 1
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\G
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```
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该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `demangle` 功能。 这种处理的结果，你在看 `trace_functions` 列的输出。
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``` text
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Row 1:
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──────
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trace_functions: DB::IAggregateFunctionHelper<DB::AggregateFunctionSum<unsigned long, unsigned long, DB::AggregateFunctionSumData<unsigned long> > >::addBatchSinglePlace(unsigned long, char*, DB::IColumn const**, DB::Arena*) const
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DB::Aggregator::executeWithoutKeyImpl(char*&, unsigned long, DB::Aggregator::AggregateFunctionInstruction*, DB::Arena*) const
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DB::Aggregator::executeOnBlock(std::vector<COW<DB::IColumn>::immutable_ptr<DB::IColumn>, std::allocator<COW<DB::IColumn>::immutable_ptr<DB::IColumn> > >, unsigned long, DB::AggregatedDataVariants&, std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >&, std::vector<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >, std::allocator<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> > > >&, bool&)
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DB::Aggregator::executeOnBlock(DB::Block const&, DB::AggregatedDataVariants&, std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >&, std::vector<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >, std::allocator<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> > > >&, bool&)
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DB::Aggregator::execute(std::shared_ptr<DB::IBlockInputStream> const&, DB::AggregatedDataVariants&)
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DB::AggregatingBlockInputStream::readImpl()
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DB::IBlockInputStream::read()
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DB::ExpressionBlockInputStream::readImpl()
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DB::IBlockInputStream::read()
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DB::ExpressionBlockInputStream::readImpl()
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DB::IBlockInputStream::read()
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DB::AsynchronousBlockInputStream::calculate()
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std::_Function_handler<void (), DB::AsynchronousBlockInputStream::next()::{lambda()#1}>::_M_invoke(std::_Any_data const&)
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ThreadPoolImpl<ThreadFromGlobalPool>::worker(std::_List_iterator<ThreadFromGlobalPool>)
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ThreadFromGlobalPool::ThreadFromGlobalPool<ThreadPoolImpl<ThreadFromGlobalPool>::scheduleImpl<void>(std::function<void ()>, int, std::optional<unsigned long>)::{lambda()#3}>(ThreadPoolImpl<ThreadFromGlobalPool>::scheduleImpl<void>(std::function<void ()>, int, std::optional<unsigned long>)::{lambda()#3}&&)::{lambda()#1}::operator()() const
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ThreadPoolImpl<std::thread>::worker(std::_List_iterator<std::thread>)
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execute_native_thread_routine
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start_thread
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clone
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```
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