Slow performance in Controller due to inability to use available CPU cores in SQL server

Troubleshooting

Problem

Users experience performance issues in Controller.

During the diagnosis, the root cause is found that the database (SQL) server has plenty of CPU cores (for example 16) but only some (for example 4) are being utilised.

Symptom

I.T. administrator logs onto the SQL server, and looks in Task Manager, inside tab "Performance". Inside there, there are many (for example 16) separate CPU graphs, indicating that Windows can successfully see many (for example 16) CPU cores.

However, during the 'busy' periods of time, only some (e.g. 4) of these graphs actually are active.

In addition, the overall CPU usage percentage figure will only ever reach a limit (e.g. 4/16 = 25%), and never reach the full potential (100%).

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Document Information

More support for:
IBM Cognos Controller

Software version:
All Versions

Operating system(s):
Windows

Document number:
482067

Modified date:
08 May 2025

UID

swg21615289

IBM Support

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