MySQL :: MySQL 9.0 參考手冊 :: 29.12.4 Performance Schema 等待事件表

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29.12.4 Performance Schema 等待事件表

29.12.4.1 events_waits_current 表格
29.12.4.2 events_waits_history 表格
29.12.4.3 events_waits_history_long 表格

Performance Schema 檢測等待，也就是需要時間的事件。在事件階層中，等待事件會巢狀於階段事件中，階段事件會巢狀於陳述式事件中，而陳述式事件會巢狀於交易事件中。

這些表格儲存等待事件

events_waits_current：每個執行緒的目前等待事件。
events_waits_history：每個執行緒最近結束的等待事件。
events_waits_history_long：最近在全域（跨所有執行緒）結束的等待事件。

以下章節描述等待事件表格。還有摘要表格會彙總關於等待事件的資訊；請參閱第 29.12.20.1 節，「等待事件摘要表格」。

如需有關三個等待事件表格之間關係的詳細資訊，請參閱第 29.9 節，「Performance Schema 用於目前和歷史事件的表格」。

設定等待事件收集

若要控制是否收集等待事件，請設定相關儀器和消費者的狀態

setup_instruments 表格包含名稱開頭為 wait 的儀器。使用這些儀器來啟用或停用個別等待事件類別的收集。

mysql> SELECT NAME, ENABLED, TIMED
       FROM performance_schema.setup_instruments
       WHERE NAME LIKE 'wait/io/file/innodb%';
+-------------------------------------------------+---------+-------+
| NAME                                            | ENABLED | TIMED |
+-------------------------------------------------+---------+-------+
| wait/io/file/innodb/innodb_tablespace_open_file | YES     | YES   |
| wait/io/file/innodb/innodb_data_file            | YES     | YES   |
| wait/io/file/innodb/innodb_log_file             | YES     | YES   |
| wait/io/file/innodb/innodb_temp_file            | YES     | YES   |
| wait/io/file/innodb/innodb_arch_file            | YES     | YES   |
| wait/io/file/innodb/innodb_clone_file           | YES     | YES   |
+-------------------------------------------------+---------+-------+
mysql> SELECT NAME, ENABLED, TIMED
       FROM performance_schema.setup_instruments
       WHERE NAME LIKE 'wait/io/socket/%';
+----------------------------------------+---------+-------+
| NAME                                   | ENABLED | TIMED |
+----------------------------------------+---------+-------+
| wait/io/socket/sql/server_tcpip_socket | NO      | NO    |
| wait/io/socket/sql/server_unix_socket  | NO      | NO    |
| wait/io/socket/sql/client_connection   | NO      | NO    |
+----------------------------------------+---------+-------+

mysql> SELECT *
       FROM performance_schema.setup_consumers
       WHERE NAME LIKE 'events_waits%';
+---------------------------+---------+
| NAME                      | ENABLED |
+---------------------------+---------+
| events_waits_current      | NO      |
| events_waits_history      | NO      |
| events_waits_history_long | NO      |
+---------------------------+---------+

[mysqld]
performance-schema-instrument='wait/%=ON'
performance-schema-consumer-events-waits-current=ON
performance-schema-consumer-events-waits-history=ON
performance-schema-consumer-events-waits-history-long=ON

[mysqld]
performance-schema-instrument='wait/%=OFF'
performance-schema-consumer-events-waits-current=OFF
performance-schema-consumer-events-waits-history=OFF
performance-schema-consumer-events-waits-history-long=OFF

UPDATE performance_schema.setup_instruments
SET ENABLED = 'YES', TIMED = 'YES'
WHERE NAME LIKE 'wait/%';

UPDATE performance_schema.setup_consumers
SET ENABLED = 'YES'
WHERE NAME LIKE 'events_waits%';

UPDATE performance_schema.setup_instruments
SET ENABLED = 'NO', TIMED = 'NO'
WHERE NAME LIKE 'wait/%';

UPDATE performance_schema.setup_consumers
SET ENABLED = 'NO'
WHERE NAME LIKE 'events_waits%';