[AlwaysOn]创建SQLServer高可用性组T-SQL语法：BACKUP_PRIORITY参数

BACKUP_PRIORITY = n

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指定此副本相对于同一可用性组中的其他副本执行备份的优先级。Specifies your priority for performing backups on this replica relative to the other replicas in the same availability group. 该值是0到100之间的整数。The value is an integer in the range of 0..100. 这些值具有以下含义：These values have the following meanings:

l   1 到100表示可以选择可用性副本执行备份。1..100 indicates that the availability replica could be chosen for performing backups. 1表示最低优先级，100表示最高优先级。1 indicates the lowest priority, and 100 indicates the highest priority. 如果备份优先级设置为1，那么只有在当前没有更高优先级的可用性副本可用时，才选择该可用性副本来执行备份。If BACKUP_PRIORITY = 1, the availability replica would be chosen for performing backups only if no higher priority availability replicas are currently available.

l   表示此可用性副本不用于执行备份。0 indicates that this availability replica is not for performing backups. 例如，对于您从不希望备份故障转移到的远程可用性副本，这很有用。This is useful, for example, for a remote availability replica to which you never want backups to fail over.

有关详细信息，请参阅活动辅助副本：辅助副本上的备份(始终在可用性组上)。For more information, see Active Secondaries: Backup on Secondary Replicas (Always On Availability Groups).

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