将上面获取到的表名写入一个文件,如optimiz_table.tables 写个脚本来循环跑 #!/bin/bash set -eux set -o pipefail table_file='optimize_table.tables' log_file='optimize_table.log' while read line do sql="optimize table $line" echo "`date +"%F %T"`: begin $sql" | tee -a "$log_file...
Optimize All Tables Using Windows Command Line: -- Syntax: mysqlcheck -o your_database_name -u username -pPasswordmysqlcheck-o test-u root-p Optimize All Tables Using Ubuntu Terminal: -- if you are signed in as a superusermysqlcheck-o test-u root-p-- if you are not signed in as ...
DELIMITER $$DROPPROCEDUREIFEXISTS`mysql`.`sp_optimize_tables`$$CREATEPROCEDURE`mysql`.`sp_optimize_tables`(INdb_namevarchar(255))BEGIN--Created by david yeung 20080128.--To optimize all the tables in exact database.declarecntintdefault0;declareiintdefault0;selectcount(*)astotalfrominformation_sc...
Optimizing MySQL tables is a crucial step in improving the performance and efficiency of your database. By employing effective optimization techniques, you can enhance query execution speed, reduce storage requirements, and optimize resource utilization. This article explores various strategies and best ...
optimize table:优化表,同时支持MyISAM和InnoDB表。回收删除操作造成的空洞,比如回收索引。 repair table:修复表,支持 MyISAM,ARCHIVE以及CSV 表。 1.1 定期分析表和检查表 定期分析与检查主要有两个关键命令: analyze:分析表,analyze table table_name; check:检查表,check table table_name; 分析(analyze)表语法:...
4. Defrag All Tables or All Databases If you want to optimize all the tables in a particular MySQL database, use the following command. The following command will optimize all the tables located in thegeekstuff database. mysqlcheck -o thegeekstuff -u root -pMySQLSecretPwd99 ...
问题的起因是另外某篇文字中,对于optimize table 理解不深,说出optimize table 时会和 vacuum full 一样阻塞表的DML操作,马上就有好友指出,你说的不对,并拿出evidence. 所以借此篇,1来证明optimize table 不阻塞DML 2 表示对好友lmongo的感谢, 有一个能指出你错误,并大胆友善说出来的人,不多,要感谢。
这里,我们用一个select语句取出初始数据,通过一些计算,用update语句将新值更新到表中。包含有WRITE关键字的LOCKTABLE语句可以保证在UNLOCKTABLES命令被执行之前,不会有其它的访问来对inventory进行插入、更新或者删除的操作。 6、使用外键 锁定表的方法可以维护数据的完整性,但是它却不能保证数据的关联性。这个时候我们就...
optimize all the tables in your MySQL database, if you have to make a choice between the tables to optimize, you can try to see the space that the table has occupied but not utilized to store records. In other words, if a table contains enough unutilized space, you should optimize that...
union all:对两个结果集进行并集操作,包括重复行,不进行排序; union因为要进行重复值扫描,所以在结果集庞大的情况下,效率极低,因此建议使用union all。 若结果集去重是强需求,则在应用程序代码上进行去重,因为数据库资源要比应用服务器资源更加珍贵。 4、善用 staright_join straight_join功能同inner join类似,但...