mysql磁盘占用排查，mysql存储空间占比统计，mysql判断哪张表占用磁盘空间大

1. mysql 磁盘满了，导致服务挂掉，扩容后，需要排查是哪写数据占用过高，下面是排查命令

2. 查看mysql 各个库下占用比例：

   SELECT
   table_schema AS '数据库',
   ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS '总大小(MB)'
   FROM
   information_schema.tables
   GROUP BY
   table_schema
   ORDER BY
   SUM(data_length + index_length) DESC;

3. 可以看到是哪个库占用后，再去查当前库下的哪写表占用过大的磁盘空间：

注意，power 需要替换为你自己的库名称

SELECT 
    table_name AS '表名',
    ROUND(data_length / 1024 / 1024, 2) AS '数据大小(MB)',
    ROUND(index_length / 1024 / 1024, 2) AS '索引大小(MB)',
    ROUND((data_length + index_length) / 1024 / 1024, 2) AS '总大小(MB)',
    table_rows AS '估算行数'
FROM 
    information_schema.tables
WHERE 
    table_schema = 'power' -- 替换为实际的数据库名
    AND table_type = 'BASE TABLE'
ORDER BY 
    (data_length + index_length) DESC;

4. 上述命令即可排查出来是什么占用磁盘空间大的表，进而处理，备份或者删除！