由于各种原因,mysql主从架构经常会出现数据不一致的情况出现,大致归结为如下几类1:备库写数据2:执行non-deterministicquery3:回滚掺杂事务表和非事务表的事务4
一:安装percona-toolkit
# yum -y install perl-Time-HiRes # wget # tar -zxvpf percona-toolkit-2.2.13.tar.gz # cd percona-toolkit-2.2.13 # perl Makefile.PL # make # make install
1. 先校验
1: 主库上建表,插入测试数据
mysql> create table t2 (id int primary key,name varchar(100) not null,salary int); mysql> CREATE PROCEDURE test_insert () BEGIN DECLARE i INT DEFAULT 0; WHILE i CALL test_insert();从库上校验当前数据的同步情况为正常。
从库上删除一半的数据
mysql> delete from t2 where id > 5000; Query OK, 4999 rows affected (0.14 sec) mysql> select count(*) from t2; +----------+ | count(*) | +----------+ | 5001 | +----------+ 1 row in set (0.01 sec)进行校验:
# pt-table-checksum --user=root --password=123456 \ --host=192.168.1.205 --port=3306 \ --databases=test --tables=t2 --recursion-method=processlist \ --no-check-binlog-format --nocheck-replication-filters \ --replicate=test.checksums mysql> SELECT * FROM test.checksums WHERE master_cnt this_cnt OR master_crc this_crc OR ISNULL(master_crc) ISNULL(this_crc) # pt-table-sync --execute --replicate \ test.checksums --sync-to-master h=192.168.1.207,P=3306,u=root,p=123456主从库my.cnf文件添加如下配置项后重启数据库实例
character_set_client=utf8 character_set_server=utf8 # pt-table-sync --execute --replicate \ test.checksums --charset=utf8 \ --sync-to-master h=192.168.1.207,P=3306,u=root,p=123456本文出自 “斩月” 博客,谢绝转载!
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