【转】MySQL查看表占用空间大小(转)

//先进去MySQL自带管理库：information_schema
//自己的数据库：rokid_cas_music_test
//自己的表：data_song_thirdparty  

mysql> use information_schema;
Database changed
mysql> select data_length,index_length
    from information_schema.tables where table_schema='rokid_cas_music_test' and table_name = 'data_song_thirdparty'; 

+-------------+--------------+
| data_length | index_length |
+-------------+--------------+
| 15993798656 | 8825700352 |
+-------------+--------------+
1 row in set (0.00 sec)

row in set (0.02 sec)  

mysql> select concat(round(sum(data_length//),),'MB') as data_length_MB,
    concat(round(sum(index_length//),),'MB') as index_length_MB
    from information_schema.tables where
    table_schema='rokid_cas_music_test'
    and table_name = 'data_song_thirdparty';

+----------------+-----------------+
| data_length_MB | index_length_MB |
+----------------+-----------------+
| 15252.88MB | 8416.84MB |
+----------------+-----------------+
1 row in set (0.01 sec)

row in set (0.03 sec)

查询MySQL数据库中每个数据库数据和索引所占的数据大小，单位G，保留两位小数

select table_schema,round(sum(data_length)/1024/1024/1024,3) as datasize, round(sum(index_length)/1024/1024/1024,3) as indexsize
from information_schema.tables
where table_schema != 'information_schema' and table_schema != 'mysql' and table_schema != 'performance_schema'
group by table_schema
order by datasize desc;

查询MySQL数据库中每个表的数据和索引所占的数据大小，单位G，保留两位小数

select table_schema,table_name,round(sum(data_length)/1024/1024/1024,3) as datasize, round(sum(index_length)/1024/1024/1024,3) as indexsize
from information_schema.tables
where table_schema != 'information_schema' and table_schema != 'mysql' and table_schema != 'performance_schema'
group by table_schema,table_name
order by datasize desc;

【转自】：http://www.cnblogs.com/qq78292959/archive/2012/12/26/2833698.html