Symptoms
Consider the following scenario:
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You use Microsoft SQL Server 2012 Reporting Services (SSRS 2012) or SQL Server 2014 Reporting Services (SSRS 2014).
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You create a data-driven subscription and you use a query to drive the subscription.
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The query takes longer than 30 seconds to fully execute.
In this scenario, you cannot create the subscription because the query cannot be validated.
Resolution
The issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 3 for SQL Server 2014 /en-us/help/2984923
Cumulative Update 1 for SQL Server 2012 SP2 /en-us/help/2976982
Cumulative Update 10 for SQL Server 2012 SP1 /en-us/help/2954099
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
More Information
This issue occurs because of a defect in SQL Server 2012. For data-driven subscriptions, any time-out specified by user is not honored by using the web UI or API calls. This will result in long-running queries timing out when you click Validate or Next in the UI, or validate by using API calls.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.