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;
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”
到此这篇关于mysql 查询数据库容量大小的方法步骤的文章就介绍到这了,更多相关mysql 查询数据库容量大小内容请搜索<计算机技术网(www.ctvol.com)!!>以前的文章或继续浏览下面的相关文章希望大家以后多多支持<计算机技术网(www.ctvol.com)!!>！
需要了解更多数据库技术:Mysql 查询数据库容量大小的方法步骤，都可以关注数据库技术分享栏目—计算机技术网(www.ctvol.com)!
本文来自网络收集，不代表计算机技术网立场，如涉及侵权请联系管理员删除。
ctvol管理联系方式QQ:251552304
本文章地址：https://www.ctvol.com/dtteaching/820014.html