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').
The issue was first fixed in the following 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: