Oracle DataGuard主备切换之自动切换

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于 2025-03-31 10:59:39 发布 · 391 阅读

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#oracle #数据库

1、设置primary和standby启动时参数文件为spfile

SQL>  show parameter spfile;

2、设置DG_BROKER_START为TRUE
将主备库的dg_broker_start的VALUE设置为true。

SQL>alter system set dg_broker_start=true scope=both;

SQL>! ps -ef|grep dmon

SQL>show parameter dg_broker_start；

SQL>SELECT d.DBID,

d.DB_UNIQUE_NAME,

d.FORCE_LOGGING,

d.FLASHBACK_ON,

d.FS_FAILOVER_STATUS,

d.FS_FAILOVER_CURRENT_TARGET,

d.FS_FAILOVER_THRESHOLD,

d.FS_FAILOVER_OBSERVER_PRESENT,

d.FS_FAILOVER_OBSERVER_HOST

 FROM v$database d;

3、配置监听
需要在listener.ora静态添加一个service_name为db_unique_name_DGMGRL.db_domain的注册。这个service_name会在DGMGRL重启数据库的时候用到。通过DGMGRL重启数据库时DMON进程会先将数据库关闭，然后DGMGRL用此service_name通过listener连接到数据库，发出启动命令。tnsnames.ora主备库保持一致。
主库：

 vi /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora

# listener.ora Network Configuration File: /u01/oracle/product/11.2.0/db_1/network/admin/listener.ora

# Generated by Oracle configuration tools.
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = standbynode)(PORT = 1521))
      )
    )
  )
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME=orcl11gdg)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
      (SID_NAME = orcl11g)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = orcl11gdg_DGMGRL.lhr.com)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
      (SID_