数据库——MySQL如何查看table(表)占用空间的大小（库、表所占磁盘空间大小）

最新推荐文章于 2025-04-21 09:34:20 发布

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最新推荐文章于 2025-04-21 09:34:20 发布

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本文介绍如何使用SQL查询语句来获取MySQL中指定数据库及表的数据长度和索引长度，进一步转换为MB单位以直观展示所占磁盘空间。

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//先进去MySQL自带管理库：information_schema
//然后查询 data_length,index_length
//你自己的数据库名：dbname
//你自己的表名：tablename

mysql> use information_schema;
Database changed
mysql> select data_length,index_length
-> from tables where
-> table_schema='dbname'
-> and table_name = 'tablename';
+-------------+--------------+
| data_length | index_length |
+-------------+--------------+
| 166379520 | 235782144 |
+-------------+--------------+
row in set (0.02 sec)

mysql> select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,
-> concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB
-> from tables where
-> table_schema='dbname'
-> and table_name = 'tablename';
+----------------+-----------------+
| data_length_MB | index_length_MB |
+----------------+-----------------+
| 158.67MB | 224.86MB |
+----------------+-----------------+
row in set (0.03 sec)

查看MySQL库、表所占磁盘空间大小

查询库

SELECT CONCAT(TRUNCATE(SUM(data_length)/1024/1024,2),'MB') AS data_size,
CONCAT(TRUNCATE(SUM(max_data_length)/1024/1024,2),'MB') AS max_data_size,
CONCAT(TRUNCATE(SUM(data_free)/1024/1024,2),'MB') AS data_free,
CONCAT(TRUNCATE(SUM(index_length)/1024/1024,2),'MB') AS index_size
FROM information_schema.tables WHERE TABLE_SCHEMA = '数据库名';

查询库

SELECT CONCAT(TRUNCATE(SUM(data_length)/1024/1024,2),'MB') AS data_size,
CONCAT(TRUNCATE(SUM(max_data_length)/1024/1024,2),'MB') AS max_data_size,
CONCAT(TRUNCATE(SUM(data_free)/1024/1024,2),'MB') AS data_free,
CONCAT(TRUNCATE(SUM(index_length)/1024/1024,2),'MB') AS index_size
FROM information_schema.tables WHERE TABLE_NAME = '表名';