ClickHouse/docs/zh/operations/system-tables/query_thread_log.md

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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

 SELECT * FROM system.query_thread_log LIMIT 1 FORMAT Vertical

Row 1:
──────
event_date:           2020-05-13
event_time:           2020-05-13 14:02:28
query_start_time:     2020-05-13 14:02:28
query_duration_ms:    0
read_rows:            1
read_bytes:           1
written_rows:         0
written_bytes:        0
memory_usage:         0
peak_memory_usage:    0
thread_name:          QueryPipelineEx
thread_id:            28952
master_thread_id:     28924
query:                SELECT 1
is_initial_query:     1
user:                 default
query_id:             5e834082-6f6d-4e34-b47b-cd1934f4002a
address:              ::ffff:127.0.0.1
port:                 57720
initial_user:         default
initial_query_id:     5e834082-6f6d-4e34-b47b-cd1934f4002a
initial_address:      ::ffff:127.0.0.1
initial_port:         57720
interface:            1
os_user:              bayonet
client_hostname:      clickhouse.ru-central1.internal
client_name:          ClickHouse client
client_revision:      54434
client_version_major: 20
client_version_minor: 4
client_version_patch: 1
http_method:          0
http_user_agent:
quota_key:
revision:             54434
ProfileEvents:        {'Query':1,'SelectQuery':1,'ReadCompressedBytes':36,'CompressedReadBufferBlocks':1,'CompressedReadBufferBytes':10,'IOBufferAllocs':1,'IOBufferAllocBytes':89,'ContextLock':15,'RWLockAcquiredReadLocks':1}
...

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。