mysql查看数据库大小、索引大小与表数量

假定要查的数据库名称是“xxxx_mall”

1、查看数据库数据占用大小

select concat(round(sum(DATA_LENGTH/1024/1024),2),\'MB\') as data from information_schema.TABLES where table_schema=\'xxxx_mall\'

 

2、查看数据库索引占用大小

 

select concat(round(sum(INDEX_LENGTH/1024/1024),2),\'MB\') as data from information_schema.TABLES where table_schema=\'xxxx_mall\'

 

3、查看数据库各个表的行数，索引大小，数据大小

select table_name,table_rows,concat(round((index_length)/1024/1024,2),\'MB\') index_data ,concat(round((data_length)/1024/1024,2),\'MB\') data_data

from information_schema.TABLES where table_schema=\'xxxx_mall\'

 

4、查看各个数据库的表个数

select count(*) tables, table_schema from information_schema.tables group by table_schema