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Aaron Bertrand

Aaron is a Product Evangelist for SentryOne, makers of Plan Explorer and a performance monitoring and event management platform for the Microsoft Data Platform and VMware. He has been blogging here at since 2006, focusing on manageability, performance, and new features, and also blogs at and; has been a Microsoft MVP since 1997; tweets as @AaronBertrand; and speaks frequently at major conferences, user group meetings, and SQL Saturday events worldwide.

Out-of-band AG hotfix for SQL Server 2012 SP2 and SQL Server 2014

A hotfix has been released for an issue that causes Availability Groups to show as NOT SYNCHRONIZING. The original issue is described in KB #3033492 and in this SQL Server Release Services Team blog post.

The issue was introduced through Cumulative Update #5 for SQL Server 2014 RTM, and through Cumulative Updates #3 and #4 for SQL Server 2012 SP2. As far as I can tell, SQL Server 2012 SP1 is not exposed to this issue, likely because the specific fix in CU3/4 that triggered the issue was not present in the most recent CU for SP1 (and CUs for RTM stopped a long time ago - so if you're still on RTM, here's another reminder to get onto a supported branch, preferably SP2).

If you're using Availability Groups, or are currently at builds >= 11.0.5556 or >= 12.0.2456, I highly recommend applying the appropriate hotfix. You can download it here:

And you can also see my recommendations in the following blog posts:

Published Wednesday, February 4, 2015 6:51 PM by AaronBertrand



Chris Wood said:

February 4, 2015 10:40 PM
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