Performance degrades while this feature runs

Be aware that there is a difference between the data obtained by IDCAMS DCOLLECT and by the Dataset Attribute Database feature. See the IBM Z OMEGAMON AI for Storage: User's Guide for more information.

Limitation:

Performance issues occur during the Dataset Attribute data collection cycle.

Workaround:

Data collection runs as set of subtasks within the address space of the Tivoli® Enterprise Monitoring Server. Consider the following options when a new collection cycle is started:

Clear the Collect Catalog data option. This setting greatly reduces the resource consumption and elapsed time of the collection cycle, but any attributes that might have been obtained from the catalog are unavailable.
Exclude any unneeded volumes or storage groups from collection, specifying them explicitly and/or using masks.
Schedule the collection to run only as often as necessary to rebuild the memory-resident database, and at a time when impact on the overall system will be minimal.