1 1、進入information_schema 數據庫（存放了其他的數據庫的信息） 2 use information_schema; 3 4 2、查詢所有數據的大小： 5 select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables; 6 7 3、查看指定數據庫的大小： 8 比如查看數據庫home的大小 9 select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='home';
10 查看數據所占的空間大小 11 SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024),2) + ROUND(SUM(index_length)/(1024*1024),2),'MB') AS 'DB Size' 12 FROM information_schema.`TABLES` WHERE table_schema='dbname' 13 14 15 4、查看指定數據庫的某個表的大小 16 比如查看數據庫home中 members 表的大小 17 select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='home' and table_name='members'; 18 select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables where table_schema='dbname' and table_name='t_msg_app_new'; 19 20 5、查看指定數據庫的表的大小 大到小 21 SELECT table_name,CONCAT(ROUND((data_length/1024/1024),2),'MB') AS DATA FROM TABLES WHERE table_schema='dbname' ORDER BY data_length DESC; 22 23 6、查看指定數據庫表的創建時間，更新時間。 24 SELECT table_name,create_time,update_time FROM information_schema.`TABLES` WHERE table_schema='dbname' ORDER BY update_time DESC 25 26 SELECT table_name,table_rows,create_time,update_time 27 FROM information_schema.`TABLES` WHERE table_schema='dbname' and table_name='tablename' ORDER BY update_time DESC

28 7、查看所有存儲引擎為MyISAM的表 29 SELECT * FROM `information_schema`.`TABLES` WHERE TABLE_SCHEMA='dbname' AND `engine`='MyISAM' 30 31 8、查詢表中的所有列 32 SELECT GROUP_CONCAT(column_name)AS namestr 33 FROM information_schema.`COLUMNS` WHERE table_name='tablename' ; 34 35 9、查詢表中的所有列(拼接插入INSERT SQL) 36 SELECT CONCAT('INSERT INTO ',table_name,'(',GROUP_CONCAT(column_name),')VALUES()')AS namestr 37 FROM information_schema.`COLUMNS` WHERE table_schema='dbname' AND table_name='tablename' ; 38 39 10、#查看是否開啟事件 40 select @@event_scheduler

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轉載于:https://www.cnblogs.com/cyun/p/5565612.html

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