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

1. select
2. table_schema as '数据库',
3. table_name as '表名',
4. table_rows as '记录数',
5. truncate(data_length/1024/1024, 2) as '数据容量(MB)',
6. truncate(index_length/1024/1024, 2) as '索引容量(MB)'
7. from information_schema.tables
8. 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

1. select
2. table_schema as '数据库',
3. sum(table_rows) as '记录数',
4. sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',
5. sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
6. from information_schema.tables
7. 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

1. select
2. table_schema as '数据库',
3. table_name as '表名',
4. table_rows as '记录数',
5. truncate(data_length/1024/1024, 2) as '数据容量(MB)',
6. truncate(index_length/1024/1024, 2) as '索引容量(MB)'
7. from information_schema.tables
8. where table_schema='mysql'
9. order by data_length desc, index_length desc;