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系统。query_thread_log

包含有关执行查询的线程的信息，例如，线程名称、线程开始时间、查询处理的持续时间。

开始记录:

  1. 在配置参数 query_thread_log 科。
  2. 设置 log_query_threads 到1。

数据的冲洗周期设置在 flush_interval_milliseconds 的参数 query_thread_log 服务器设置部分。 要强制冲洗，请使用 SYSTEM FLUSH LOGS 查询。

ClickHouse不会自动从表中删除数据。 看 导言 欲了解更多详情。

列:

  • event_date (日期) — The date when the thread has finished execution of the query.
  • event_time (日期时间) — The date and time when the thread has finished execution of the query.
  • query_start_time (日期时间) — Start time of query execution.
  • query_duration_ms (UInt64) — Duration of query execution.
  • read_rows (UInt64) — Number of read rows.
  • read_bytes (UInt64) — Number of read bytes.
  • written_rows (UInt64) — For INSERT 查询，写入的行数。 对于其他查询，列值为0。
  • written_bytes (UInt64) — For INSERT 查询时，写入的字节数。 对于其他查询，列值为0。
  • memory_usage (Int64) — The difference between the amount of allocated and freed memory in context of this thread.
  • peak_memory_usage (Int64) — The maximum difference between the amount of allocated and freed memory in context of this thread.
  • thread_name (字符串) — Name of the thread.
  • thread_number (UInt32) — Internal thread ID.
  • thread_id (Int32) — thread ID.
  • master_thread_id (UInt64) — OS initial ID of initial thread.
  • query (字符串) — Query string.
  • is_initial_query (UInt8) — Query type. Possible values:
    • 1 — Query was initiated by the client.
    • 0 — Query was initiated by another query for distributed query execution.
  • user (字符串) — Name of the user who initiated the current query.
  • query_id (字符串) — ID of the query.
  • address (IPv6) — IP address that was used to make the query.
  • port (UInt16) — The client port that was used to make the query.
  • initial_user (字符串) — Name of the user who ran the initial query (for distributed query execution).
  • initial_query_id (字符串) — ID of the initial query (for distributed query execution).
  • initial_address (IPv6) — IP address that the parent query was launched from.
  • initial_port (UInt16) — The client port that was used to make the parent query.
  • interface (UInt8) — Interface that the query was initiated from. Possible values:
    • 1 — TCP.
    • 2 — HTTP.
  • os_user (字符串) — OS’s username who runs ﾂ环板clientｮﾂ嘉ｯﾂ偲.
  • client_hostname (字符串) — Hostname of the client machine where the ﾂ环板clientｮﾂ嘉ｯﾂ偲 或者运行另一个TCP客户端。
  • client_name (字符串) — The ﾂ环板clientｮﾂ嘉ｯﾂ偲 或另一个TCP客户端名称。
  • client_revision (UInt32) — Revision of the ﾂ环板clientｮﾂ嘉ｯﾂ偲 或另一个TCP客户端。
  • client_version_major (UInt32) — Major version of the ﾂ环板clientｮﾂ嘉ｯﾂ偲 或另一个TCP客户端。
  • client_version_minor (UInt32) — Minor version of the ﾂ环板clientｮﾂ嘉ｯﾂ偲 或另一个TCP客户端。
  • client_version_patch (UInt32) — Patch component of the ﾂ环板clientｮﾂ嘉ｯﾂ偲 或另一个TCP客户端版本。
  • http_method (UInt8) — HTTP method that initiated the query. Possible values:
    • 0 — The query was launched from the TCP interface.
    • 1 — GET 方法被使用。
    • 2 — POST 方法被使用。
  • http_user_agent (字符串) — The UserAgent http请求中传递的标头。
  • quota_key (字符串) — The “quota key” 在指定 配额 设置（见 keyed).
  • revision (UInt32) — ClickHouse revision.
  • ProfileEvents (数组（字符串, UInt64)) — Counters that measure different metrics for this thread. The description of them could be found in the table 系统。活动.

示例

  1.  SELECT * FROM system.query_thread_log LIMIT 1 FORMAT Vertical
  1. Row 1:
  2. ──────
  3. event_date:           2020-05-13
  4. event_time:           2020-05-13 14:02:28
  5. query_start_time:     2020-05-13 14:02:28
  6. query_duration_ms:    0
  7. read_rows:            1
  8. read_bytes:           1
  9. written_rows:         0
  10. written_bytes:        0
  11. memory_usage:         0
  12. peak_memory_usage:    0
  13. thread_name:          QueryPipelineEx
  14. thread_id:            28952
  15. master_thread_id:     28924
  16. query:                SELECT 1
  17. is_initial_query:     1
  18. user:                 default
  19. query_id:             5e834082-6f6d-4e34-b47b-cd1934f4002a
  20. address:              ::ffff:127.0.0.1
  21. port:                 57720
  22. initial_user:         default
  23. initial_query_id:     5e834082-6f6d-4e34-b47b-cd1934f4002a
  24. initial_address:      ::ffff:127.0.0.1
  25. initial_port:         57720
  26. interface:            1
  27. os_user:              bayonet
  28. client_hostname:      clickhouse.ru-central1.internal
  29. client_name:          ClickHouse client
  30. client_revision:      54434
  31. client_version_major: 20
  32. client_version_minor: 4
  33. client_version_patch: 1
  34. http_method:          0
  35. http_user_agent:
  36. quota_key:
  37. revision:             54434
  38. ProfileEvents:        {'Query':1,'SelectQuery':1,'ReadCompressedBytes':36,'CompressedReadBufferBlocks':1,'CompressedReadBufferBytes':10,'IOBufferAllocs':1,'IOBufferAllocBytes':89,'ContextLock':15,'RWLockAcquiredReadLocks':1}
  39. ...

另请参阅

  • 系统。query_log — Description of the query_log 系统表，其中包含有关查询执行的公共信息。