查看 MySQL「所有库」的容量大小

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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)',
sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;
123456789

特别提示：data_length 、index_length 等字段，所存储的容量信息单位是字节，所以我们要除以 2 个 1024 把字节转化为可读性更强的 MB

查看 MySQL「指定库」的容量大小

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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)',
sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)'
from information_schema.tables
where table_schema='metersphere'
order by data_length desc, index_length desc;

注意： 请将代码中 ‘kalacloud_test_data’ 数据库名改为你要查询的数据库名。

查看 MySQL「指定库」中「所有表」的容量大小

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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)',
  truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)'
from 
  information_schema.tables
where 
  table_schema='metersphere'
order by 
  data_length desc, index_length desc;

查看 MySQL 数据库中，容量排名前 10 的表

首先，先进入 information_schema 库里，然后执行以下命令：

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USE information_schema;
SELECT 
  TABLE_SCHEMA as '数据库',
  table_name as '表名',
  table_rows as '记录数',
  ENGINE as '存储引擎',
  truncate(data_length/1024/1024, 2) as '数据容量(MB)',
  truncate(index_length/1024/1024, 2) as '索引容量(MB)',
  truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)'
from  tables 
order by table_rows desc limit 10;

查看 MySQL「指定库」中，容量排名前 10 的表

我们先进入 information_schema 库里，再执行以下命令：

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USE information_schema;
SELECT 
  TABLE_SCHEMA as '数据库',
  table_name as '表名',
  table_rows as '记录数',
  ENGINE as '存储引擎',
  truncate(data_length/1024/1024, 2) as '数据容量(MB)',
  truncate(index_length/1024/1024, 2) as '索引容量(MB)',
  truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)'
from  tables 
where 
  table_schema='kalacloud_test_data' 
order by table_rows desc limit 10;