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没有共享存储和仲裁盘的SQL Server 2012HADR故障手动切换TSQL

因为一些原因有些SQLSERVER集群中没有配置仲裁盘，只有一主一辅两个实例。

配置如下：

USE [master] GO CREATE AVAILABILITY GROUP [ak51DB] WITH (AUTOMATED_BACKUP_PREFERENCE = SECONDARY) FOR DATABASE [ak51Activity],[ak51Load] REPLICA ON N'ak51-DB35' WITH (ENDPOINT_URL = N'TCP://ak51-DB35.580top.com:5022', FAILOVER_MODE = MANUAL, AVAILABILITY_MODE = ASYNCHRONOUS_COMMIT, SESSION_TIMEOUT = 10, BACKUP_PRIORITY = 100, PRIMARY_ROLE(ALLOW_CONNECTIONS = ALL), SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)), N'ak51-DB36' WITH (ENDPOINT_URL = N'TCP://ak51-DB36.580top.com:5022', FAILOVER_MODE = MANUAL, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, SESSION_TIMEOUT = 10, BACKUP_PRIORITY = 50, PRIMARY_ROLE(ALLOW_CONNECTIONS = ALL), SECONDARY_ROLE(ALLOW_CONNECTIONS = NO)); GO

这时候是不具备SQL Server 2012 Always on的自动故障转移条件的 但是它万一出现主机故障时，需要手动强起辅机的 脚本很简单：

ALTER AVAILABILITY GROUP [ak51db] FORCE_FAILOVER_ALLOW_DATA_LOSS;

需要注意的是：如果是异步提交,强起辅机可能会有数据丢失

当主机重新连线时，再切回来后，会发现高可用性组处于“未同步"状态

这时候需要运行TSQL重新恢复可用性组:

ALTER DATABASE [ak51Load] SET HADR RESUME; ALTER DATABASE [ak51Activity] SET HADR RESUME;

至于我为什么不选用高可用性侦听组和仲裁盘的原因，这里很复杂。。。

原文：http://www.580top.com/html/201303/dba_2129.htm

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没有共享存储和仲裁盘的SQL Server 2012HADR故障手动切换TSQL

因为一些原因有些SQLSERVER集群中没有配置仲裁盘，只有一主一辅两个实例。

配置如下：

USE [master] GO CREATE AVAILABILITY GROUP [ak51DB] WITH (AUTOMATED_BACKUP_PREFERENCE = SECONDARY) FOR DATABASE [ak51Activity],[ak51Load] REPLICA ON N'ak51-DB35' WITH (ENDPOINT_URL = N'TCP://ak51-DB35.580top.com:5022', FAILOVER_MODE = MANUAL, AVAILABILITY_MODE = ASYNCHRONOUS_COMMIT, SESSION_TIMEOUT = 10, BACKUP_PRIORITY = 100, PRIMARY_ROLE(ALLOW_CONNECTIONS = ALL), SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)), N'ak51-DB36' WITH (ENDPOINT_URL = N'TCP://ak51-DB36.580top.com:5022', FAILOVER_MODE = MANUAL, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, SESSION_TIMEOUT = 10, BACKUP_PRIORITY = 50, PRIMARY_ROLE(ALLOW_CONNECTIONS = ALL), SECONDARY_ROLE(ALLOW_CONNECTIONS = NO)); GO

这时候是不具备SQL Server 2012 Always on的自动故障转移条件的 但是它万一出现主机故障时，需要手动强起辅机的 脚本很简单：

ALTER AVAILABILITY GROUP [ak51db] FORCE_FAILOVER_ALLOW_DATA_LOSS;

需要注意的是：如果是异步提交,强起辅机可能会有数据丢失

当主机重新连线时，再切回来后，会发现高可用性组处于“未同步"状态

这时候需要运行TSQL重新恢复可用性组:

ALTER DATABASE [ak51Load] SET HADR RESUME; ALTER DATABASE [ak51Activity] SET HADR RESUME;

至于我为什么不选用高可用性侦听组和仲裁盘的原因，这里很复杂。。。

原文：http://www.580top.com/html/201303/dba_2129.htm

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