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这篇文章给大家介绍 Mysql 怎样查看数据库大小,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
1 命令行进入数据库
[root@80 ~]# mysql -uroot -p
Enter password:
2 查看数据库
mysql show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| test |
+--------------------+
3 查看 information_schema 的 TABLES
mysql use information_schema;
| TABLES |
4 查看字段结构
mysql desc tables;
+-----------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+---------------------+------+-----+---------+-------+
| TABLE_CATALOG | varchar(512) | NO | | | |
| TABLE_SCHEMA | varchar(64) | NO | | | |
| TABLE_NAME | varchar(64) | NO | | | |
| TABLE_TYPE | varchar(64) | NO | | | |
| ENGINE | varchar(64) | YES | | NULL | |
| VERSION | bigint(21) unsigned | YES | | NULL | |
| 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 | |
| MAX_DATA_LENGTH | bigint(21) unsigned | YES | | NULL | |
| INDEX_LENGTH | bigint(21) unsigned | YES | | NULL | |
| 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 | | | |
+-----------------+---------------------+------+-----+---------+-------+
5 查看 DB 的数据大小
mysql select table_schema,round(sum(DATA_LENGTH)/1024/1024,2) as table_size from tables group by table_schema;
+--------------------+------------+
| table_schema | table_size |
+--------------------+------------+
| bomo_backend | 0.09 |
| test1 | 234.16 |
| test2 | 0.17 |
| information_schema | 0.00 |
| mysql | 0.71 |
| performance_schema | 0.00 |
| test | 0.03 |
+--------------------+------------+
6 查看 table 的数据大小
mysql select table_schema,table_name,concat(round(data_length/1024/1024,2), M ) as table_size from tables where table_schema = grab
+--------------+--------------+------------+
| table_schema | table_name | table_size |
+--------------+--------------+------------+
| grab | product | 215.12M |
| grab | result | 13.52M |
| grab | rule | 0.02M |
| grab | task | 5.52M |
+--------------+--------------+------------+
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