MySQL数据库查看相关库、表大小

查看所有数据库各表容量大小；便于清理内存。清理内存可以语句删除，也可以把不要的表删除再新建，这样没有索引内存，要数据再去做一点，方便快捷

• 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;
  

• 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;
  

• 查看指定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
    where table_schema='mysql'
    order by data_length desc, index_length desc;
  

  
• 查看指定数据库容量大小

    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
    where table_schema='mysql';