查看MySql数据库物理文件存放位置
show variables
like
'datadir'
查所有数据库占用空间大小
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_length desc;
查指定数据库占用空间大小
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 = 'im_db'
group by TABLE_NAME
order by data_length desc;
MYSQL:查看的数据库表空间
- /*1.查看索引
- (1)单位是GB*/
- SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 6), ' GB') AS 'Total Index Size'
- FROM information_schema.TABLES WHERE table_schema LIKE 'database';
- /*
- +------------------+
- | Total Index Size |
- +------------------+
- | 1.70 GB |
- +------------------+
- */
- /*
- (2)单位是MB
- */
- SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 6), ' MB') AS 'Total Index Size'
- FROM information_schema.TABLES WHERE table_schema LIKE 'database';
- /*
- 其中“database”为你所要查看的数据库
- */
- /*
- 2.查看表空间
- */
- SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024*1024), 6), ' GB') AS 'Total Data Size'
- FROM information_schema.TABLES WHERE table_schema LIKE 'database';
- /*
- +-----------------+
- | Total Data Size |
- +-----------------+
- | 3.01 GB |
- +-----------------+
- */
- /*
- 3.查看数据库中所有表的信息
- */
- SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name',
- table_rows AS 'Number of Rows',
- CONCAT(ROUND(data_length/(1024*1024*1024),6),' G') AS 'Data Size',
- CONCAT(ROUND(index_length/(1024*1024*1024),6),' G') AS 'Index Size' ,
- CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),6),' G') AS'Total'
- FROM information_schema.TABLES
- WHERE table_schema LIKE 'database';