Mysql 查询数据库容量大小的方法步骤_Mysql

Mysql 查询数据库容量大小的方法步骤

2021-01-21 16:35Jevic Mysql

这篇文章主要介绍了Mysql 查询数据库容量大小的方法步骤，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

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;