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1. 异常描述
使用xtrabackup对主库进行备份,在从节点主机上进行恢复,并将还原后的实例部署为主库的从节点。在启动介质与主库版本一致的情况下,启动主从同步后,日志出现如下错误:
2022-10-30T11:44:17.442001Z 296 [ERROR] InnoDB: Column table_name in table `mysql`.`innodb_table_stats` is VARCHAR(597) NOT NULL but should be VARCHAR(192) NOT NULL (length mismatch).
2022-10-30T11:44:17.442029Z 296 [ERROR] InnoDB: Fetch of persistent statistics requested for table `testdb1`.`tb1` but the required system tables mysql.innodb_table_stats and mysql.innodb_index_stats are not present or have unexpected structure. Using transient stats instead.
2022-10-30T11:44:17.567223Z 296 [ERROR] InnoDB: Column table_name in table `mysql`.`innodb_table_stats` is VARCHAR(597) NOT NULL but should be VARCHAR(192) NOT NULL (length mismatch).
2022-10-30T11:44:17.567240Z 296 [ERROR] InnoDB: Fetch of persistent statistics requested for table `testdb2`.`tb1` but the required system tables mysql.innodb_table_stats and mysql.innodb_index_stats are not present or have unexpected structure. Using transient stats instead.
/usr/local/mysql5.7/bin/mysqld_safe --defaults-file=/app/data/mysql3307/etc/my.cnf
[ops@ck2 ~]$ /usr/local/mysql5.7/bin/mysqld --version
/usr/local/mysql5.7/bin/mysqld Ver 5.7.25-28 for Linux on x86_64 (Percona Server (GPL), Release 28, Revision c335905)
但是登录数据库中查看版本:
确实与启动的版本不一致。
2. 解决方案
查看本机上mysql是否有多个版本的启动文件
经查,确实如此。而第一个版本正式启动后数据库里检测到的版本。
2.1 解决思路
检查配置文件:检查环境变量
export MYSQL_HOME=/app/mysql5.7
export MY_BASEDIR_VERSION=/app/mysql5.7
export PATH=/app/mysql5.7/bin:/app/mysql5.7/scripts:$PATH
export LD_LIBRARY_PATH=/app/mysql5.7/lib
发现环境变量里配置的确实是mysql5.7.18的路径。
2.2 调整环境变量
将对应的路径改为当前版本的路径
export MYSQL_HOME=/usr/local/mysql5.7
export MY_BASEDIR_VERSION=/usr/local/mysql5.7
export PATH=/usr/local/mysql5.7/bin:/usr/local/mysql5.7/scripts:$PATH
export LD_LIBRARY_PATH=/usr/local/mysql5.7/lib
2.3 重启数据库
关闭数据库
mysql> set global innodb_fast_shutdown=0;
Query OK, 0 rows affected (0.00 sec)
mysql> shutdown;
启动数据库
numactl --interleave=all usr/local/mysql5.7/bin/mysqld_safe --defaults-file=/app/data/mysql3307/etc/my.cnf &
查看版本,是预期的情况了。
检查配置文件: 也没有再出现对应的错误了,至此问题解决。
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