Friday, June 9, 2017

SQL Azure Databases - Active Secondary - Failover - Part 3

Continuing on the series on SQL Azure Databases - Active Secondary, this post will explore the task of failing over to secondary.

Fairly straightforward task, just one needs to take care of few items.

Step 1: Login into and click on Databases. The primary and secondary databases are listed

Step 2: Click on the primary and then click on "Geo Replication"

Step 3: Scroll down and click on the secondary as shown below

Step 4: Click on Failover as shown below

Step 5: Click "Ok" to confirm Failover

Step 6: The dotted lines between primary and secondary, showing the failover progress, turn to solid line upon completion of failover

Step 7: After failover, the replication role changes confirming the successful failover as shown below

Step 8: Secondary server accepts write operations as shown below

Few important things to know

This failover is like a DB Mirroring failover. This means application will need to change their connection strings to secondary server upon failover. Unlike, Always on Availability groups, azure geo replication explained above, doesn't support transparent application failover.

However, Azure Failover Groups (right now in preview) allows transparent failover for applications. More about that on next post :)

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