mysql- sql-mode   数据库大小查询

Posted 2020-10-09

mysql ---查看数据库和表大小

查看mysql数据库大小的四种办法，分别有以下四种：

第一种：进去指定schema 数据库（存放了其他的数据库的信息）

use information_schema

第二种：查询所有数据的数据文件和索引文件 大小

select concat(round(sum(DATA_LENGTH/1024/1024),2),‘MB‘) as data_size from information_schema.TABLES;

select concat(round(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;

第三种：查看指定数据库的数据文件和索引文件 的大小，比如说：数据库test

select concat(round(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 where table_schema=‘test‘;  

第四种：查看指定数据库的表的数据文件和作引文件 大小，比如说：数据库test 中am21表

select concat(round(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 where table_schema=‘test‘ and table_name=‘am21‘;

综合查询在   5.7不适用   是因为sql_mode未设置

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_length DESC;

报错如下

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘GROUP BY TABLE_SCHEMA

ORDER BY data_length DESC‘ at line 1

解决办法---  echo "sql_mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"" >> /etc/my.cnf   重启mysql,再次执行

查看sql_mode

mysql -uroot -psunfuzhou -e "SHOW VARIABLES LIKE ‘SQL_MODE‘;"

设置sql_mode

临时设置sql_mode

mysql -uroot -psunfuzhou -e "SET  sql_mode=‘NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION ‘"

全局设置sql_mode

mysql -uroot -psunfuzhou -e "SET global  sql_mode=‘NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION ‘"

SET @@GLOBAL.sql_mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION";

 

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_length DESC;

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