MySQL5.6起performance schema自動開啟，裏面涉及記錄 statement event的表

mysql> show tables like ‘%statement%‘;
+----------------------------------------------------+
| Tables_in_performance_schema (%statement%)         |
+----------------------------------------------------+
| events_statements_current                          |
| events_statements_history                          |
| events_statements_history_long                     |
| events_statements_summary_by_account_by_event_name |
| events_statements_summary_by_digest                |
| events_statements_summary_by_host_by_event_name    |
| events_statements_summary_by_program               |
| events_statements_summary_by_thread_by_event_name  |
| events_statements_summary_by_user_by_event_name    |
| events_statements_summary_global_by_event_name     |
| prepared_statements_instances                      |
+----------------------------------------------------+
11
 
 rows in set (0.00 sec)

statement event 的設置

詳細參考官方文檔：https://dev.mysql.com/doc/refman/5.6/en/performance-schema-statement-tables.ht

server端發生的所有的statement都會記錄，當前未結束的會話發生的statement記錄在表events_statements_current，已結束的會話線程發生的statement記錄在events_statements_history，此表有大小限制，默認是100，達到限制會刪除老的statement

設置記錄哪些類型的statement，默認設置為所有的類型

mysql> SELECT * FROM setup_instruments WHERE NAME LIKE ‘statement/%‘;
+---------------------------------------------+---------+-------+
| NAME                                        | ENABLED | TIMED |
+---------------------------------------------+---------+-------+
| statement/sql/select                        |
 
 YES     | YES   |
| statement/sql/create_table                  | YES     | YES   |
| statement/sql/create_index                  | YES     | YES   |
...
| statement/sp/stmt                           | YES     | YES   |
| statement/sp/set                            | YES     | YES   |
| statement/sp/set_trigger_field              | YES     | YES   |
| statement/scheduler/event                   | YES     | YES   |
| statement/com/Sleep                         | YES     | YES   |
| statement/com/Quit                          | YES     | YES   |
| statement/com/Init DB                       | YES     | YES   |
...
| statement/abstract/Query                    | YES     | YES   |
| statement/abstract/new_packet               | YES     | YES   |
| statement/abstract/relay_log                | YES     | YES   |
+---------------------------------------------+---------+-------+

關於對statement event相關表的設置，MySQL5.6 默認events_statements_history關閉，MySQL5.7開啟

mysql> SELECT * FROM setup_consumers WHERE NAME LIKE ‘%statements%‘;
+--------------------------------+---------+
| NAME                           | ENABLED |
+--------------------------------+---------+
| events_statements_current      | YES     |
| events_statements_history      | NO      |
| events_statements_history_long | NO      |
| statements_digest              | YES     |
+--------------------------------+---------+

如果通過pmm來收集慢查詢，其查詢的是表events_statements_history_long，MySQL5.6需要啟用此表

啟用events_statements_history

UPDATE setup_consumers SET ENABLED = ‘NO‘
WHERE NAME LIKE ‘events_statements_history‘;

通過performance schema收集慢查詢