Mysql ---查看數據庫和表大小

查看mysql數據庫大小的四種辦法，分別有以下四種：

第一種：進去指定schema 數據庫（存放了其他的數據庫的信息）

use information_schema

第二種：查詢所有數據的數據文件和索引文件 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;

第三種：查看指定數據庫的數據文件和索引文件 的大小，比如說：數據庫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‘;

第四種：查看指定數據庫的表的數據文件和作引文件 大小，比如說：數據庫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‘;

綜合查詢在 5.7不適用 是因為sql_mode未設置

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;

報錯如下

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

解決辦法--- echo "sql_mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"" >> /etc/my.cnf 重啟mysql,再次執行

查看sql_mode

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

設置sql_mode

臨時設置sql_mode

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

全局設置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;

本文出自 “linux運維” 博客，請務必保留此出處http://sunfuzhou.blog.51cto.com/8603214/1969687

mysql- sql-mode 數據庫大小查詢