MySQL常用性能突发事件分析命令：

  1. SHOW PROCESSLIST; —当前MySQL数据库的运行的所有线程

  2. INNODB_TRX; — 当前运行的所有事务

  3. INNODB_LOCKS; — 当前出现的锁

  4. INNODB_LOCK_WAITS; — 锁等待的对应关系计

  5. SHOW OPEN TABLES where In_use >0; — 当前打开表

  6. SHOW ENGINE INNODB STATUS \G; —Innodb状态

  7. SHOW STATUS LIKE ‘innodb_row_lock_%'; — 锁性能状态

  8. SQL语句EXPLAIN; — 查询优化器

数据库size查看

-- databases size
select table_schema as '数据库', sum(table_rows) as '记录数', sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)', sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)' from information_schema.tables group by table_schema order by sum(data_length) desc, sum(index_length) desc;

-- table size
select table_schema as '数据库', table_name as '表名', table_rows as '记录数', truncate(data_length/1024/1024, 2) as '数据容量(MB)', truncate(index_length/1024/1024, 2) as '索引容量(MB)' from information_schema.tables order by data_length desc, index_length desc;