Mysql 查询数据库容量大小的方法步骤

查询所有数据库的总大小

方法如下：

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mysql> use information_schema; mysql> select concat(round( sum (DATA_LENGTH/1024/1024),2), 'MB' ) as data from TABLES; + -----------+ | data   | + -----------+ | 3052.76MB | + -----------+ 1 row in set (0.02 sec)

统计一下所有库数据量

每张表数据量=AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH

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SELECT SUM (AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb FROM information_schema.TABLES

统计每个库大小：

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SELECT table_schema, SUM (AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb FROM information_schema.TABLES group by table_schema;

第二种情况：查看指定数据库的大小，比如说：数据库test，方法如下：

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mysql> use information_schema; mysql> select concat(round( sum (DATA_LENGTH/1024/1024),2), 'MB' ) as data from TABLES where table_schema= 'test' ; + ----------+ | data   | + ----------+ | 142.84MB | + ----------+ 1 row in set (0.00 sec)

1.查看所有数据库各容量大小

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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 ;

2.查看所有数据库各表容量大小

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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 ;

3.查看指定数据库容量大小

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例：查看mysql库容量大小 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 where table_schema= 'mysql' ;

4.查看指定数据库各表容量大小

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例：查看mysql库各表容量大小   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 where table_schema= 'mysql' order by data_length desc , index_length desc ;

题外方法

直接用shell命令统计mysql data目录中的大小（注意只有库，不包含数据库日志大小）

备注 ：

data_length ：存储数据大小

data_length/1024/1024：将字节转换为MB

round(sum(data_length/1024/1024),2)：取两位小数

concat(round(sum(data_length/1024/1024),2),'MB') ：给计算结果追加单位 “MB”

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原文链接：https://segmentfault.com/a/1190000022874702