Microsoft distributes Microsoft SQL Server 2012 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2012 fix release.
Symptoms
Consider the following scenario:
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You have an instance of Microsoft SQL Server 2012 that has the AlwaysOn Availability Groups feature enabled.
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You add several availability groups (AGs) to the instance.
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You join a secondary replica into these AGs two times.
In this scenario, the secondary databases in the secondary replica may be in "unknown" state. Additionally, the data movements stop, and the secondary databases cannot be accessed when the corresponding primary replica is disconnected.
Resolution
Cumulative update information
SQL Server 2012
The fix for this issue was first released in Cumulative Update 1 for SQL Server 2012. For more information about how to obtain this cumulative update package for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
2679368 Cumulative update 1 for SQL Server 2012Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server fix release. We recommend that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2692828 The SQL Server 2012 builds that were released after SQL Server 2012 was released
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Workaround
To work around this issue, bring the secondary databases online, and then rejoin the secondary replica into the AGs.
References
For more information about the AlwaysOn Availability Groups feature, visit the following Microsoft Developer Network (MSDN) website:
General information about AlwaysOn Availability GroupsFor more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problemsFor more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
822499 Naming schema for Microsoft SQL Server software update packagesFor more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
