3.3. What documentation to collect
First familiarize yourself with getting the required documentation, such as logs, dumps, traces, and messages associated with errors. There is an information APAR II12927 in IBMLINK that tells you what information you need to collect for general VSAM problems.
It is generally a good idea to include an AMBLIST of the VSAM load modules IDA019L1 and IDA0192A when sending a VSAM problem to IBM level2 support.
3.3.1. Catalog performance problems
Here is the information to collect and questions to consider.
Provide a clear and adequate description
What is not performing properly?
What is the basis for the performance expectation?
What changes appear to trigger the performance change?
Maintenance, release, application? ...