From 35672e7f6c3ede6fc67fc5043aa92cb4251c2f3e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9C=A8=E6=9C=A8=E5=A4=95120?= Date: Wed, 27 Oct 2021 13:28:24 +0800 Subject: [PATCH] Create query_views_log.md --- .../system-tables/query_views_log.md | 86 +++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 docs/zh/operations/system-tables/query_views_log.md diff --git a/docs/zh/operations/system-tables/query_views_log.md b/docs/zh/operations/system-tables/query_views_log.md new file mode 100644 index 00000000000..57946e5104a --- /dev/null +++ b/docs/zh/operations/system-tables/query_views_log.md @@ -0,0 +1,86 @@ +# system.query_views_log {#system_tables-query_views_log} + +包含有关运行查询时执行的从属视图的信息，例如视图类型或执行时间. + +开始记录: + +1. 在 [query_views_log](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-query_views_log) 部分配置参数. +2. 设置 [log_query_views](../../operations/settings/settings.md#settings-log-query-views) 为 1. + +数据的刷新周期是在[query_views_log](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-query_views_log)服务器设置部分的 `flush_interval_milliseconds` 参数中设置的. 要强制刷新，请使用[SYSTEM FLUSH LOGS](../../sql-reference/statements/system.md#query_language-system-flush_logs)查询. + +ClickHouse不会自动从表中删除数据. 详见 [Introduction](../../operations/system-tables/index.md#system-tables-introduction). + +您可以使用[log_queries_probability](../../operations/settings/settings.md#log-queries-probability)设置来减少在 `query_views_log` 表中注册的查询数量. + +列信息: + +- `event_date` ([Date](../../sql-reference/data-types/date.md)) — 视图的最后一个事件发生的日期. +- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — 视图完成执行的日期和时间. +- `event_time_microseconds` ([DateTime](../../sql-reference/data-types/datetime.md)) — 视图以微秒精度完成执行的日期和时间. +- `view_duration_ms` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — 视图执行的持续时间(各阶段之和), 以毫秒为单位. +- `initial_query_id` ([String](../../sql-reference/data-types/string.md)) — 初始查询的ID (用于分布式查询执行). +- `view_name` ([String](../../sql-reference/data-types/string.md)) — 视图名称. +- `view_uuid` ([UUID](../../sql-reference/data-types/uuid.md)) — 视图的UUID. +- `view_type` ([Enum8](../../sql-reference/data-types/enum.md)) — 视图类型. 值: + - `'Default' = 1` — [Default views](../../sql-reference/statements/create/view.md#normal). 不应该出现在日志中. + - `'Materialized' = 2` — [Materialized views](../../sql-reference/statements/create/view.md#materialized). + - `'Live' = 3` — [Live views](../../sql-reference/statements/create/view.md#live-view). +- `view_query` ([String](../../sql-reference/data-types/string.md)) — 视图执行的查询. +- `view_target` ([String](../../sql-reference/data-types/string.md)) — 视图目标表的名称. +- `read_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — 读行数. +- `read_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — 读字节数. +- `written_rows` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — 写入行数. +- `written_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md#uint-ranges)) — 写入字节数. +- `peak_memory_usage` ([Int64](../../sql-reference/data-types/int-uint.md)) — 在此视图上下文中, 已分配内存和已释放内存之间的最大差值. +- `ProfileEvents` ([Map(String, UInt64)](../../sql-reference/data-types/array.md)) — ProfileEvents度量不同的指标. 它们的描述可以在表 [system.events](../../operations/system-tables/events.md#system_tables-events) 中找到. +- `status` ([Enum8](../../sql-reference/data-types/enum.md)) — 视图状态. 值: + - `'QueryStart' = 1` — 成功启动视图执行. 不应该出现. + - `'QueryFinish' = 2` — 视图执行成功结束. + - `'ExceptionBeforeStart' = 3` — 视图执行开始前的异常. + - `'ExceptionWhileProcessing' = 4` — 视图执行期间的异常. +- `exception_code` ([Int32](../../sql-reference/data-types/int-uint.md)) — 异常代码. +- `exception` ([String](../../sql-reference/data-types/string.md)) — 异常报文. +- `stack_trace` ([String](../../sql-reference/data-types/string.md)) — [堆栈跟踪](https://en.wikipedia.org/wiki/Stack_trace). 如果查询成功完成, 则为空字符串. + +**示例** + +查询: + +``` sql +SELECT * FROM system.query_views_log LIMIT 1 \G; +``` + +结果: + +``` text +Row 1: +────── +event_date: 2021-06-22 +event_time: 2021-06-22 13:23:07 +event_time_microseconds: 2021-06-22 13:23:07.738221 +view_duration_ms: 0 +initial_query_id: c3a1ac02-9cad-479b-af54-9e9c0a7afd70 +view_name: default.matview_inner +view_uuid: 00000000-0000-0000-0000-000000000000 +view_type: Materialized +view_query: SELECT * FROM default.table_b +view_target: default.`.inner.matview_inner` +read_rows: 4 +read_bytes: 64 +written_rows: 2 +written_bytes: 32 +peak_memory_usage: 4196188 +ProfileEvents: {'FileOpen':2,'WriteBufferFromFileDescriptorWrite':2,'WriteBufferFromFileDescriptorWriteBytes':187,'IOBufferAllocs':3,'IOBufferAllocBytes':3145773,'FunctionExecute':3,'DiskWriteElapsedMicroseconds':13,'InsertedRows':2,'InsertedBytes':16,'SelectedRows':4,'SelectedBytes':48,'ContextLock':16,'RWLockAcquiredReadLocks':1,'RealTimeMicroseconds':698,'SoftPageFaults':4,'OSReadChars':463} +status: QueryFinish +exception_code: 0 +exception: +stack_trace: +``` + +**另请参阅** + +- [system.query_log](../../operations/system-tables/query_log.md#system_tables-query_log) — 包含查询执行的常用信息的 `query_log`系统表的描述. +- [system.query_thread_log](../../operations/system-tables/query_thread_log.md#system_tables-query_thread_log) — 包含关于每个查询执行线程的信息. + +[原始文章](https://clickhouse.com/docs/en/operations/system_tables/query_thread_log)