查看mysql数据库容量大小

 第一种情况： 查询所有数据库的总大小 ，方法如下： 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 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： 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： 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 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 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 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 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;