系统。query_log 

包含有关已执行查询的信息,例如,开始时间、处理持续时间、错误消息。

您可以更改查询日志记录的设置 query_log 服务器配置部分。

您可以通过设置禁用查询日志记录 log_queries=0. 我们不建议关闭日志记录,因为此表中的信息对于解决问题很重要。

数据的冲洗周期设置在 flush_interval_milliseconds 的参数 query_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。

system.query_log 表注册两种查询:

  1. 客户端直接运行的初始查询。
  2. 由其他查询启动的子查询(用于分布式查询执行)。 对于这些类型的查询,有关父查询的信息显示在 initial_* 列。

每个查询创建一个或两个行中 query_log 表,这取决于状态(见 type 列)的查询:

  1. 如果查询执行成功,则两行具有 QueryStartQueryFinish 创建类型。
  2. 如果在查询处理过程中发生错误,两个事件与 QueryStartExceptionWhileProcessing 创建类型。
  3. 如果在启动查询之前发生错误,则单个事件具有 ExceptionBeforeStart 创建类型。

列:

  • type (枚举8) — Type of an event that occurred when executing the query. Values:
    • 'QueryStart' = 1 — Successful start of query execution.
    • 'QueryFinish' = 2 — Successful end of query execution.
    • 'ExceptionBeforeStart' = 3 — Exception before the start of query execution.
    • 'ExceptionWhileProcessing' = 4 — Exception during the query execution.
  • event_date (日期) — Query starting date.
  • event_time (日期时间) — Query starting time.
  • query_start_time (日期时间) — Start time of query execution.
  • query_duration_ms (UInt64) — Duration of query execution in milliseconds.
  • read_rows (UInt64) — Total number or rows read from all tables and table functions participated in query. It includes usual subqueries, subqueries for INJOIN. 对于分布式查询 read_rows 包括在所有副本上读取的行总数。 每个副本发送它的 read_rows 值,并且查询的服务器-发起方汇总所有接收到的和本地的值。 缓存卷不会影响此值。
  • read_bytes (UInt64) — Total number or bytes read from all tables and table functions participated in query. It includes usual subqueries, subqueries for INJOIN. 对于分布式查询 read_bytes 包括在所有副本上读取的行总数。 每个副本发送它的 read_bytes 值,并且查询的服务器-发起方汇总所有接收到的和本地的值。 缓存卷不会影响此值。
  • 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。
  • result_rows (UInt64) — Number of rows in a result of the SELECT 查询,或者在一些行 INSERT 查询。
  • result_bytes (UInt64) — RAM volume in bytes used to store a query result.
  • memory_usage (UInt64) — Memory consumption by the query.
  • query (字符串) — Query string.
  • exception (字符串) — Exception message.
  • exception_code (Int32) — Code of an exception.
  • stack_trace (字符串) — 堆栈跟踪. 如果查询成功完成,则为空字符串。
  • is_initial_query (UInt8) — Query type. Possible values:
    • 1 — Query was initiated by the client.
    • 0 — Query was initiated by another query as part of 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) — Operating system 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.
  • thread_numbers (数组(UInt32)) — Number of threads that are participating in query execution.
  • ProfileEvents.Names (数组(字符串)) — Counters that measure different metrics. The description of them could be found in the table 系统。活动
  • ProfileEvents.Values (数组(UInt64)) — Values of metrics that are listed in the ProfileEvents.Names 列。
  • Settings.Names (数组(字符串)) — Names of settings that were changed when the client ran the query. To enable logging changes to settings, set the log_query_settings 参数为1。
  • Settings.Values (数组(字符串)) — Values of settings that are listed in the Settings.Names 列。

示例

SELECT * FROM system.query_log LIMIT 1 FORMAT Vertical;
Row 1:
──────
type:                 QueryStart
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:            0
read_bytes:           0
written_rows:         0
written_bytes:        0
result_rows:          0
result_bytes:         0
memory_usage:         0
query:                SELECT 1
exception_code:       0
exception:
stack_trace:
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
thread_ids:           []
ProfileEvents.Names:  []
ProfileEvents.Values: []
Settings.Names:       ['use_uncompressed_cache','load_balancing','log_queries','max_memory_usage']
Settings.Values:      ['0','random','1','10000000000']

另请参阅

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