oracle auto failover,dg设置auto failover
dg设置auto failover
auto failover即设置Fast-Start Failover
Enabling fast-start failover does not trigger a failover. Instead, it allows the observer to begin observing the primary and standby databases and initiate a fast-start failover should conditions warrant a failover.
配置步骤:
step 1:if node >2节点
双节点环境会自动设置FastStartFailoverTarget 使得primary和standby 相互指向对方
If there is more than one standby database in the configuration, you must explicitly set the FastStartFailoverTarget property on the primary database and target standby database to point to each other for the purpose of defining which standby database will be the target of a fast-start failover
在primary显示定义primary和standby相互的依赖关系:
step 2: node>=2 节点
the observer and目标 standby database 均同primary断开连接超出FastStartFailoverThreshold 指定的延时时就启动fast-start failover
设置延时:EDIT CONFIGURATION SET PROPERTY FastStartFailoverThreshold = 45;默认是30秒
step 3:enable fast-start failover
ENABLE FAST_START FAILOVER
ORA-16651: requirements not met for enabling Fast-Start Failover
Cause: The attempt to enable Fast-Start Failover could not be completed because one or more requirements have not been met:
- The Data Guard configuration must be in MaxAvailability protection mode.
***edit configuration set protection mode as MaxAvailability
- The LogXptMode property for both the primary database and the Fast-Start Failover target standby database must be SYNC.
***edit database orcl set property logxptmode=sync
***ORA-16789: missing standby redo logs
***alter database add standby logfile group 4 '/u01/app/oracle/oradata/orcl/redo04.log' size 50m;
***edit database norcl set property logxptmode=sync
- The primary database and the Fast-Start Failover target standby database must both have flashback enabled.
***primary alter database flashback on;
***standby 1、 alter database recover managed standby database 2、alter database flashback on;
- No valid target standby database was specified in the primary database"s FastStartFailoverTarget property prior to the attempt to enable Fast-Start Failover, and more than one standby database exists in the Data Guard configuration.
Step 4: Start the Observer
DGMGRL> START OBSERVER;
连续的后台进程 dgmgrl中不会返回命令行提示符
ex:
DGMGRL> start observer
Observer started
如果要终止 则需在另一个client或session 中stop observer
step 5:验证
DGMGRL> show configuration
Configuration
Name: mybroker
Enabled: YES
Protection Mode: MaxAvailability
Fast-Start Failover: ENABLED
Databases:
orcl - Primary database
norcl - Physical standby database
- Fast-Start Failover target
Current status for "mybroker":
Warning: ORA-16607: one or more databases have failed
解决:
standby:recover managed standby database disconnect from session
disable fast_start failover
disable configuration
enable configuration
enable fast_start failover
DGMGRL> show configuration
Configuration
Name: mybroker
Enabled: YES
Protection Mode: MaxAvailability
Fast-Start Failover: ENABLED
Databases:
orcl - Primary database
norcl - Physical standby database
- Fast-Start Failover target
Current status for "mybroker":
SUCCESS
DGMGRL>
step 5:测试
注意:observer要在standby主机上启用
disconnect 网卡后
DGMGRL> start observer
Observer started
06:44:52.25 Monday, October 18, 2010
Initiating fast-start failover to database "orcl"...
Performing failover NOW, please wait...
Operation requires shutdown of instance "orcl" on database "orcl"
Shutting down instance "orcl"...
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
Operation requires startup of instance "orcl" on database "orcl"
Starting instance "orcl"...
Unable to connect to database
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Failed.
You are no longer connected to ORACLE
Please connect again.
Unable to start instance "orcl"
You must start instance "orcl" manually
Unable to failover
06:46:16.60 Monday, October 18, 2010
[W000 10/18 06:46:16.61] Failover failed. Quit observer.
Observer stopped
手动启动实例后日志文件输出完成failover
Failover succeeded. Primary database is now orcl.
--failover完了后原primary是no start状态
进入dgmgrl
DGMGRL> connect
Connected.
DGMGRL> show configuration
Configuration
Name: mybroker
Enabled: YES
Protection Mode: MaxAvailability
Fast-Start Failover: ENABLED
Databases:
orcl - Primary database
norcl - Physical standby database (disabled)
- Fast-Start Failover target
Current status for "mybroker":
Warning: ORA-16607: one or more databases have failed
DGMGRL> disable fast_start failover
Error: ORA-16652: Fast-Start Failover target standby database is disabled
Failed.
DGMGRL> enable database norcl
Error: ORA-16661: the standby database needs to be reinstated
Failed.
DGMGRL> help reinstate
Change a disabled database into a viable standby database
Syntax:
REINSTATE DATABASE ;
DGMGRL> reinstate database norcl
Reinstating database "norcl", please wait...
Error: ORA-16653: failed to reinstate database
Failed.
alert没有能帮助的信息 查看broker自己的日志
../admin/orcl/bdump/drcorcl.log
...
G 2010-10-18-07:04:30 0 2 0 NSV1: Failed to connect to remote database norcl. Error is ORA-01034
DG 2010-10-18-07:04:30 0 2 0 NSV1: Can't send OPEN message to DRCX. Network error is: ORA-01034.
DG 2010-10-18-07:04:30 0 2 0 NSV1: Ending metadata file transmission.
DG 2010-10-18-07:04:30 0 2 0 NSV1: Metadata Resync failed. Status = ORA-01034
DG 2010-10-18-07:04:30 2010000 4 732696705 DMON: Database norcl returned ORA-01034
ORA-01034: ORACLE not available
把这个实例启动到mount
状态仍然是:
SQL> select database_role from v$database;
DATABASE_ROLE
----------------
PRIMARY
运行 reinstate database 来将norcl flashback到failover的scn以将norcl改造成standby database.
DGMGRL> reinstate database norcl
Reinstating database "norcl", please wait...
Operation requires shutdown of instance "orcl" on database "norcl"
Shutting down instance "orcl"...
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
Operation requires startup of instance "orcl" on database "norcl"
Starting instance "orcl"...
Unable to connect to database
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Failed.
You are no longer connected to ORACLE
Please connect again.
Unable to start instance "orcl"
You must start instance "orcl" manually
Reinstatement of database "norcl" failed
日记记录如下:
2697305 DMON: Entered rfm_release_chief_lock for EDIT_RES_PROP
DG 2010-10-18-07:09:19 0 2 0 NSV1: Failed to connect to remote database norcl. Error is ORA-12514
DG 2010-10-18-07:09:19 0 2 0 NSV1: Failed to send message to site norcl. Error code is ORA-12514.
手动启动norcl
DGMGRL> reinstate database norcl
Reinstating database "norcl", please wait...
Reinstatement of database "norcl" succeeded
ORA-12514的解决
检查每个主机的监听文件 确认实例是否静态监听 且实例名要大写
重新转换一次角色
现在observer 是norcl
DGMGRL> show configuration
Configuration
Name: mybroker
Enabled: YES
Protection Mode: MaxAvailability
Fast-Start Failover: ENABLED
Databases:
orcl - Primary database
norcl - Physical standby database
- Fast-Start Failover target ---注意。。。
Current status for "mybroker":
.....
注:broker在dgmgrl cli关闭 启动instanc 因此需注意参数local_listener 及监听文件的设置
测试时 手动shutdown instance不会导致broker自动failover 会报:
ORA-16818: Fast-Start Failover suspended Cause: The primary database was intentionally shutdown. As a result, a Fast-Start Failover could not happen automatically.
Action: Start up the primary database. This effectively restores the ability to automatically do a Fast-Start Failover in the event of a failure of the primary database.
做switchover或reinstate后都需手动启动实例?
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