Mysql----查看数据库,表占用磁盘大小

素颜马尾好姑娘i 2024-02-18 23:00 144阅读 0赞

1、查询所有数据库占用磁盘空间大小
select
TABLE_SCHEMA,
concat(truncate(sum(data_length)/1024/1024,2),’ MB’) as data_size,
concat(truncate(sum(index_length)/1024/1024,2),’MB’) as index_size
from information_schema.tables
group by TABLE_SCHEMA
ORDER BY data_size desc;

70

2、查询单个库中所有表磁盘占用大小
select
TABLE_NAME,
concat(truncate(data_length/1024/1024,2),’ MB’) as data_size,
concat(truncate(index_length/1024/1024,2),’ MB’) as index_size
from information_schema.tables
where TABLE_SCHEMA = ‘mysql’
group by TABLE_NAME
order by data_length desc;

70 1

3、information_schema 中有数个只读表。它们实际上是视图 ，而不是基本表，因此，你将无法看到与之相关的任何文件

desc information_schema.tables;
+————————-+——————————-+———+——-+————-+———-+
| Field | Type | Null | Key | Default | Extra |
+————————-+——————————-+———+——-+————-+———-+
| TABLE_CATALOG | varchar(512) | NO | | | |
| TABLE_SCHEMA | varchar(64) | NO | | | | 数据库名
| TABLE_NAME | varchar(64) | NO | | | | 表名
| TABLE_TYPE | varchar(64) | NO | | | | 引擎
| ENGINE | varchar(64) | YES | | NULL | |
| VERSION | bigint(21) unsigned | YES | | NULL | | 是否压缩
| ROW_FORMAT | varchar(10) | YES | | NULL | |
| TABLE_ROWS | bigint(21) unsigned | YES | | NULL | |
| AVG_ROW_LENGTH | bigint(21) unsigned | YES | | NULL | |
| DATA_LENGTH | bigint(21) unsigned | YES | | NULL | | 数据空间大小
| MAX_DATA_LENGTH | bigint(21) unsigned | YES | | NULL | |
| INDEX_LENGTH | bigint(21) unsigned | YES | | NULL | | 数据索引大小
| DATA_FREE | bigint(21) unsigned | YES | | NULL | |
| AUTO_INCREMENT | bigint(21) unsigned | YES | | NULL | |
| CREATE_TIME | datetime | YES | | NULL | |
| UPDATE_TIME | datetime | YES | | NULL | |
| CHECK_TIME | datetime | YES | | NULL | |
| TABLE_COLLATION | varchar(32) | YES | | NULL | |
| CHECKSUM | bigint(21) unsigned | YES | | NULL | |
| CREATE_OPTIONS | varchar(255) | YES | | NULL | |
| TABLE_COMMENT | varchar(2048) | NO | | | |
+————————-+——————————-+———+——-+————-+———-+

  1. 查看该数据库实例下所有库大小，得到的结果是以MB为单位
    select table_schema,sum(data_length)/1024/1024 as data_length,sum(index_length)/1024/1024 \
    as index_length,sum(data_length+index_length)/1024/1024 as sum from information_schema.tables;

5、查看该实例下各个库大小
select table_schema, sum(data_length+index_length)/1024/1024 as total_mb, \
sum(data_length)/1024/1024 as data_mb, sum(index_length)/1024/1024 as index_mb, \
count(*) as tables, curdate() as today from information_schema.tables group by table_schema order by 2 desc;

70 2
6、查看单个库的大小
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 = ‘erongtu_tyb2014’;

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