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mysql 数据库event_mysql数据库事件调度(Event)

發布時間：2025/3/15 数据库 36 豆豆

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Oracle數據庫監控軟件(簡稱Oracle監控或Oracle監控軟件)是企事業單位中最重要的監控需要，通過對Oracle數據庫的監控，可以全面了解Oracle的運行狀態、數據庫響應情況、數據庫表空用度情況。

SUM服務器監控軟件對Oracle數據庫的監控十分全面，主要有：緩沖區命中率監控、表空間使用率監控、表空間監控、會話數監控、連接數監控等核心性能，這些性能均為DBA必須了解和隨時掌握的性能，SUM的監控為DBA提供了有力的幫助。在Oracle數據庫的性能監控中其中表空間隨時監控是DBA首要職責，因為一旦表空用盡，將無法再進行數據庫的操作，這將給應用軟件造成很大的損失。通過SUM監控與短信報警功能，DBA可以設定表空間使用率閥值進行報警，比如可以設定表空間使用率達到95%后就立即短信通知指定的DBA進行表空間擴容，從而可以有效地避免因為表空間不足引起的應用程序錯誤和數據庫錯誤。

mysql中的事件調度器可以定時對數據庫增加,刪除和執行操作,相當于數據庫中的臨時觸發器,與Linux系統中的執行計劃任務一樣,這樣就可以大大降低工作量.

1.開啟事件調度器

[root@node1 ~]# vim /usr/my.cnf???????? --在配置文件中加入以下語句啟用調度器

event_scheduler=1

[root@node1 ~]# /etc/init.d/mysql restart

ERROR! MySQL server PID file could not be found!

Starting MySQL... SUCCESS!

[root@node1 ~]#

2.查看事件調度是否開啟

[root@node1 ~]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor.? Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.21 MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like "event_%";?????????? --查看調度器是否啟用

+-----------------+-------+

| Variable_name?? | Value |

+-----------------+-------+

| event_scheduler | ON??? |

+-----------------+-------+

1 row in set (0.00 sec)

mysql> ? create event;????????????? --查看創建事件的語法

Name: 'CREATE EVENT'

Description:

Syntax:

CREATE

[DEFINER = { user | CURRENT_USER }]

EVENT

[IF NOT EXISTS]

event_name

ON SCHEDULE schedule

[ON COMPLETION [NOT] PRESERVE]

[ENABLE | DISABLE | DISABLE ON SLAVE]

[COMMENT 'comment']

DO event_body;

schedule:

AT timestamp [+ INTERVAL interval] ...

| EVERY interval

[STARTS timestamp [+ INTERVAL interval] ...]

[ENDS timestamp [+ INTERVAL interval] ...]

interval:

quantity {YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE |

DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND}

mysql> create database test123;

Query OK, 1 row affected (0.00 sec)

mysql> \u test123

Database changed

mysql>

3.創建事件調度5秒鐘后創建t表

mysql> create event if not exists event_t on schedule at current_timestamp + interval 5 second? do create table t (a int,b nchar(10),c timestamp);

Query OK, 0 rows affected (0.00 sec)

mysql> show events;??????? --查看事件是否創建成功

+---------+----------+----------------+-----------+-----------+------------+----------------+----------------+---------------------+------+---------+------------+----------------------+----------------------+--------------------+

1 row in set (0.00 sec)

mysql> show tables;

Empty set (0.00 sec)

mysql> show tables;?????????????? --創建表成功

+-------------------+

| Tables_in_test123 |

+-------------------+

| t???????????????? |

+-------------------+

1 row in set (0.00 sec)

mysql> desc t;

+-------+-----------+------+-----+-------------------+-----------------------------+

+-------+-----------+------+-----+-------------------+-----------------------------+

| a???? | int(11)?? | YES? |???? | NULL????????????? |???????????????????????????? |

| b???? | char(10)? | YES? |???? | NULL????????????? |???????????????????????????? |

| c???? | timestamp | NO?? |???? | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |

+-------+-----------+------+-----+-------------------+-----------------------------+

3 rows in set (0.01 sec)

mysql>

4.創建事件調度每5秒在表中插入數據

mysql> create event if not exists event_t1 on schedule every? 5 second? do insert into t values(1,1,sysdate());

Query OK, 0 rows affected (0.01 sec)

mysql> select * from t;?????????? --查看事件執行數據

+------+------+---------------------+

| a??? | b??? | c?????????????????? |

+------+------+---------------------+

|??? 1 | 1??? | 2014-11-12 15:33:31 |

|??? 1 | 1??? | 2014-11-12 15:33:36 |

|??? 1 | 1??? | 2014-11-12 15:33:41 |

|??? 1 | 1??? | 2014-11-12 15:33:46 |

|??? 1 | 1??? | 2014-11-12 15:33:51 |

|??? 1 | 1??? | 2014-11-12 15:33:56 |

|??? 1 | 1??? | 2014-11-12 15:34:01 |

+------+------+---------------------+

7 rows in set (0.00 sec)

mysql>

5.創建事件調度10秒鐘后刪除t表中所有數據

mysql> create event if not exists event_t2 on schedule every? 10? second? do truncate table t;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from t;

+------+------+---------------------+

| a??? | b??? | c?????????????????? |

+------+------+---------------------+

|??? 1 | 1??? | 2014-11-12 15:36:36 |

|??? 1 | 1??? | 2014-11-12 15:36:41 |

+------+------+---------------------+

2 rows in set (0.00 sec)

mysql> select * from t;

Empty set (0.00 sec)

mysql>

6.在指定時間刪除t表數據

mysql> create event if not exists event_t2 on schedule at timestamp '2014-11-12 15:39:00' do truncate table t;;

Query OK, 0 rows affected, 1 warning (0.02 sec)

mysql> select * from t;

Empty set (0.00 sec)

mysql>

7.創建事件調度每天刪除t表數據

mysql> create event if not exists event_t2 on schedule every 1 day? do truncate table t;

Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> select * from t;

Empty set (0.00 sec)

mysql>

8.創建事件調度5天后開啟刪除t表中數據,一個月后停止

mysql> create event if not exists event_t2 on schedule every 1 day? starts current_timestamp + interval 5 day ends current_timestamp + interval 1 month do truncate table t;

Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>

9.禁用事件調度器

mysql> alter? event event_t2 disable;

Query OK, 0 rows affected (0.00 sec)

mysql>

10.啟用事件調度器

mysql> alter? event event_t2 enable;

Query OK, 0 rows affected (0.00 sec)

mysql>

11.修改事件調度器10天后啟用

mysql> alter? event event_t2 on schedule every 10 day;

Query OK, 0 rows affected (0.00 sec)

mysql>

12.重命名事件調度器

mysql> alter event event_t2 rename to event_t1;

Query OK, 0 rows affected (0.00 sec)

mysql>

13.查看事件調度器的信息

mysql> show events like "event_t1" \G;

*************************** 1. row ***************************

Db: test123

Name: event_t1

Definer:?root@localhost

Time zone: SYSTEM

Type: RECURRING

Execute at: NULL

Interval value: 10

Interval field: DAY

Starts: 2014-11-12 15:47:31

Ends: NULL

Status: ENABLED

Originator: 0

character_set_client: utf8

collation_connection: utf8_general_ci

Database Collation: latin1_swedish_ci

1 row in set (0.00 sec)

ERROR:

No query specified

mysql>

14.查看事件調度器的內容

mysql> show create event event_t1 \G;

*************************** 1. row ***************************

Event: event_t1

sql_mode: STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION

time_zone: SYSTEM

Create Event: CREATE?DEFINER=`root`@`localhost` EVENT `event_t1` ON SCHEDULE EVERY 10 DAY STARTS '2014-11-12 15:47:31' ON COMPLETION NOT PRESERVE ENABLE DO truncate table t

character_set_client: utf8

collation_connection: utf8_general_ci

Database Collation: latin1_swedish_ci

1 row in set (0.00 sec)

ERROR:

No query specified

mysql>

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