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事件调度器操作
查看事件调度器是否开启：ON 表示已开启。

show variables like '%event_scheduler%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| event_scheduler | ON    |
+-----------------+-------+
开启和关闭事件调度器：

# 开启事件调度器
set global event_scheduler = ON;
# 关闭事件调度器
set global event_scheduler = OFF;

SHOW EVENTS;

SELECT EVENT_SCHEMA, EVENT_NAME, DEFINER, EVENT_TYPE, EXECUTE_AT, INTERVAL_VALUE, INTERVAL_FIELD, STARTS, ENDS, STATUS 
FROM information_schema.EVENTS 
WHERE EVENT_SCHEMA = 'oa';

SELECT 
    EVENT_SCHEMA as 'Database', 
    EVENT_NAME as 'Event Name', 
    LAST_EXECUTED as 'Last Executed'
FROM 
    information_schema.EVENTS
WHERE 
    EVENT_SCHEMA = 'oa';