Mysql----查看数据库,表占用磁盘大小

查询所有[数据库]占用磁盘空间大小

 select
 TABLE_SCHEMA,
 concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size,
 concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size
 from information_schema.tables
 group by TABLE_SCHEMA
 ORDER BY data_size desc;
 
 
order by data_length desc;
 
 

查询单个库中所有表磁盘占用大小

 select
 TABLE_NAME,
 concat(truncate(data_length/1024/1024,2),' MB') as data_size,
 concat(truncate(index_length/1024/1024,2),' MB') as index_size
 from information_schema.tables
 where TABLE_SCHEMA = 'mysql'
 group by TABLE_NAME
 order by data_length desc;
 

information_schema 中有数个只读表。它们实际上是视图 ，而不是基本表，因此，你将无法看到与之相关的任何文件

 mysql> desc information_schema.tables;
 +-----------------+---------------------+------+-----+---------+-------+
 | Field | Type | Null | Key | Default | Extra |
 +-----------------+---------------------+------+-----+---------+-------+
 | TABLE_CATALOG | varchar(512) | NO | | | |
 | TABLE_SCHEMA | varchar(64) | NO | | | | 数据库名
 | TABLE_NAME | varchar(64) | NO | | | | 表名
 | TABLE_TYPE | varchar(64) | NO | | | | 引擎
 | ENGINE | varchar(64) | YES | | NULL | |
 | VERSION | bigint(21) unsigned | YES | | NULL | | 是否压缩
 | ROW_FORMAT | varchar(10) | YES | | NULL | |
 | TABLE_ROWS | bigint(21) unsigned | YES | | NULL | |
 | AVG_ROW_LENGTH | bigint(21) unsigned | YES | | NULL | |
 | DATA_LENGTH | bigint(21) unsigned | YES | | NULL | | 数据空间大小
 | MAX_DATA_LENGTH | bigint(21) unsigned | YES | | NULL | |
 | INDEX_LENGTH | bigint(21) unsigned | YES | | NULL | | 数据索引大小
 | DATA_FREE | bigint(21) unsigned | YES | | NULL | |
 | AUTO_INCREMENT | bigint(21) unsigned | YES | | NULL | |
 | CREATE_TIME | datetime | YES | | NULL | |
 | UPDATE_TIME | datetime | YES | | NULL | |
 | CHECK_TIME | datetime | YES | | NULL | |
 | TABLE_COLLATION | varchar(32) | YES | | NULL | |
 | CHECKSUM | bigint(21) unsigned | YES | | NULL | |
 | CREATE_OPTIONS | varchar(255) | YES | | NULL | |
 | TABLE_COMMENT | varchar(2048) | NO | | | |
 +-----------------+---------------------+------+-----+---------+-------+