WRH$_ACTIVE_SESSION_HISTORY未自动清理导致SYSAUX空间过度增长的处理方法
参考MOS文档: WRH$_ACTIVE_SESSION_HISTORY Does Not Get Purged Based Upon the Retention Policy (文档 ID 387914.1)CauseOracle decides what rows need to be purged based on the retention policy. There is a
【MySQL】通过show status 优化数据库性能
【MySQL】通过show status 优化数据库性能 官方文档:https://dev.mysql.com/doc/refman/5.7/en/show-status.html 点击(此处)折叠或打开 mysql> ? show status Name: 'SHOW STATUS'Description:Syntax:SHOW [GLOBAL | SESSI...
innodb_force_recovery设置
mysql> show variables like '%innodb_force_recovery%';+-----------------------+-------+| Variable_name | Value |+-----------------------+-------+| innodb_force_recovery | 0 |+----...
index merge合并索引
mysql> create index ind_t2_name on t2(name);Query OK, 0 rows affected (0.18 sec)Records: 0 Duplicates: 0 Warnings: 0mysql> create index ind_t2_addr on t2(address);Query OK, 0 rows affected (0.11 sec)Records: 0 Duplicates: 0 Warni...
slave_exec_mode设置自动跳过同步复制错误
slave_exec_mode设置可以跳过1032(记录没有找到)和1062(主键重复)错误,并记录到错误日志中。slave_exec_mode和slave_skip_errors作用是一样的,只是slave_exec_mode可以在线动态设置。slave_skip_errors必须添加到配置文件中,重启生效。备库mysql> select * from testdb1.student;+------+------+-...
开启relay_log_recovery
当slave从库宕机后,假如relay-log损坏了,导致一部分中继日志没有处理,则自动放弃所有未执行的relay-log,并且重新从master上获取日志,这样就保证了relay-log的完整性。默认情况下该功能是关闭的,将relay_log_recovery的值设置为 1时,可在slave从库上开启该功能,建议开启。mysql> set global relay_lo...