MySql数据库相关操作

1.查看所有数据库容量大小

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
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 table_schema,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;