查看库大小

    例如：查看当前MySQL中数据总量超过2GB的库：

select 
  table_schema as '数据库',
  table_rows as '记录数',
  data_size as '数据容量(GB)',
  index_size as '索引容量(MB)'
from (
  select
    table_schema,
    sum(table_rows) as 'table_rows',
    sum(truncate(data_length/1024/1024/1024, 1)) as 'data_size',
    sum(truncate(index_length/1024/1024, 1)) as 'index_size'
  from information_schema.tables
  group by table_schema
) as t
where data_size > 2
order by data_size desc, index_size desc

   执行结果：

查看表大小

    例如：查看数据总量超过300MB的数据库表：

select 
  CONCAT(table_schema,".",table_name) as '数据库表',
  table_rows as '记录数',
  data_size as '数据容量(MB)',
  index_size as '索引容量(MB)'
from (
  select
    table_schema, table_name, table_rows,
    truncate(data_length/1024/1024, 1) as 'data_size',
    truncate(index_length/1024/1024, 1) as 'index_size'
  from information_schema.tables
) as t
where data_size > 300
order by data_size desc, index_size desc

执行结果：