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AlwaysOn Availability Groups Synchronous Replica Readable Secondary Data Access Latency

With SQL Server AlwaysOn Availability Groups, when you configure a secondary in synchronous-commit mode for read-only access, there can be data access latency.

If you make changes to your data like if you perform insert, update or delete in primary, those changes may not be visible in the secondary, synchronous replica enabled for read-only access for a certain amount of time, because writing to Log is synchronous, but not REDO. REDO is asynchronous, that is, applying those changes from Log is asynchronous.

The below video demonstrates this with hands-on example. SQLTest Tool simulates the hands-on labs for you, no registration necessary. You can practice the online hands-on example while watching the video.

Check out www.sqlvideo.com for additional hands-on videos.

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Ramesh Meyyappan’s SQL Server Performance Tuning Blog

Ramesh Meyyappan (www.sqlworkshops.com) is a SQL Server specialist with expertise in Performance Tuning. Ramesh worked at Microsoft Corporation from 1994 to 2004. Nearly half of that time he worked in Redmond in the development teams - specifically as Program Manager in the SQL Server Development Team responsible for optimizing SQL Server product for SAP. Ramesh now offers onsite and offsite consulting and workshops independently as well as by partnering with various Microsoft Subsidiaries. LinkedIn Profile: http://de.linkedin.com/in/rmeyyappan.


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