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transactional replication 的immediate_sync属性

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Jun 07, 2016 pm 05:40 PM

replication

transactional replication 的immediate_sync属性在默认情况下，immediate_sync是关闭的，这个属性可以在创建publication时指定，也可以在创建完毕后修改。如果immediate_sync为true, snapshot 文件和replicated transaction将一直保留到data retention.然

transactional replication 的immediate_sync属性

在默认情况下，香港服务器，immediate_sync是关闭的，这个属性可以在创建publication时指定，也可以在创建完毕后修改。如果immediate_sync为true, snapshot 文件和replicated transaction将一直保留到data retention.然后才会被删除。这会导致distribution 数据库增长，香港空间，复制性能下降。所以推荐设置为false. 需要注意的时，如果一个数据库有多个publication，只要其中有一个publication的immediate_sync为true,将会导致这个数据库的所有publication的replicated transaction的保留期都延长至data retention.

您可以在distribution database里执行下面的语句进行检查：

inner =1 and publication_type =0

语句会列出immediate_sync为true的publication以及数据库和服务器信息。下面是一个执行结果的截图。

之后您需要去发布数据库执行下面的语句将immediate_sync禁止

有时候一些元数据信息无法被正确修改，导致即使immediate_sync为false, replicated transaction 仍然会被保留下来。所以需要在distribution database中进行额外的检查：

如果这个查询仍然返回结果，服务器空间，则说明metadata有问题了。需要手工进行删除(请在Microsoft support service的指导下执行下面的语句)

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