mysqldiff该工具是官方mysql-utilities工具集的一个脚本,可以实现主从服务器表结构是否一致。数据校验需要使用Percona的pt-table-checksum工具。安装:#tarzxvf
mysqldiff该工具是官方mysql-utilities工具集的一个脚本,可以实现主从服务器表结构是否一致。数据校验需要使用Percona的pt-table-checksum工具。
安装:
# tar zxvf mysql-utilities-1.5.4.tar.gz # cd mysql-utilities-1.5.4 # python setup.py install使用方法:
mysqldiff --server1=admin:123456@192.168.79.10 --server2=admin:123456@192.168.79.11 --difftype=differ test:test # WARNING: Using a password on the command line interface can be insecure. # server1 on 192.168.79.10: ... connected. # server2 on 192.168.79.11: ... connected. # Comparing `test` to `test` [PASS] # Comparing `test`.`t1` to `test`.`t1` [FAIL] # Object definitions differ. (--changes-for=server1) # CREATE TABLE `t1` ( `id` int(11) DEFAULT NULL, - `name` char(4) DEFAULT NULL ? ^ + `name` char(16) DEFAULT NULL ? ^^ ) ENGINE=InnoDB DEFAULT CHARSET=utf8 Compare failed. One or more differences found.很直观的找出不一样的地方。
如果你想打印出修改表结构的语句,如下:
# mysqldiff --server1=admin:123456@192.168.79.10 --server2=admin:123456@192.168.79.11 --difftype=sql test:test # WARNING: Using a password on the command line interface can be insecure. # server1 on 192.168.79.10: ... connected. # server2 on 192.168.79.11: ... connected. # Comparing `test` to `test` [PASS] # Comparing `test`.`t1` to `test`.`t1` [FAIL] # Transformation for --changes-for=server1: # ALTER TABLE `test`.`t1` CHANGE COLUMN name name char(16) NULL; Compare failed. One or more differences found.本文出自 “贺春旸的技术专栏” 博客,,请务必保留此出处

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mysqlviewshavelimitations:1)他們不使用Supportallsqloperations,限制DatamanipulationThroughViewSwithJoinsOrsubqueries.2)他們canimpactperformance,尤其是withcomplexcomplexclexeriesorlargedatasets.3)

porthusermanagementinmysqliscialforenhancingsEcurityAndsingsmenting效率databaseoperation.1)usecReateusertoAddusers,指定connectionsourcewith@'localhost'or@'%'。

mysqldoes notimposeahardlimitontriggers,butacticalfactorsdeterminetheireffactective:1)serverConfiguration impactactStriggerGermanagement; 2)複雜的TriggerSincreaseSySystemsystem load; 3)largertablesslowtriggerperfermance; 4)highConconcConcrencerCancancancancanceTigrignecentign; 5); 5)


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