FIX: A crash occurs when proactive caching is triggered for a dimension in SSAS 2012 or SSAS 2014

Symptoms
Assume that you have a Multidimensional OLAP (MOLAP) dimension that has enabled the Proactive Caching feature in Microsoft SQL Server 2012 Analysis Service (SSAS 2012) or SQL Server 2014 Analysis Service (SSAS 2014), and the dimension is referenced by a cube that has a Relational OLAP (ROLAP) partition. When data changes in the source database cause proactive caching to be triggered for the dimension, a crash occurs, and you receive the following error message:
Internal error: An unexpected error occurred (file 'mdprocesspart.cpp', line 164, function 'MDProcessPartitionJob::LaunchJobInternal').
Resolution
The issue was first fixed in the following cumulative updates for SQL Server:

Cumulative Update 2 for SQL Server 2014 SP1

Cumulative Update 6 for SQL Server 2014

Cumulative Update 4 for SQL Server 2012 SP2

About cumulative updates for SQL Server

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:

Workaround
To work around this issue, use Hybrid OLAP (HOLAP) mode instead of Relational OLAP (ROLAP) mode in SSAS 2012.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 3028216 - Last Review: 08/25/2015 09:38:00 - Revision: 8.0

Microsoft SQL Server 2012 Service Pack 2, Microsoft SQL Server 2012 Analysis Services, Microsoft SQL Server 2014 Service Pack 1, Microsoft SQL Server 2014 Business Intelligence

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