Discover various methods to monitor Buffer usage and database calls in IMS DB programs. Enhance your understanding and optimize performance effectively.
IMS DB Monitor and How to Use It
Detailed information
- The IMS monitor collects information about database calls and buffer usage in an IMS subsystem over a predetermined amount of time.
- The //DFSSTAT DD card, used in batch JCL to provide a summary of buffer usage and database calls.
- As there is very little overhead in including this (the details printed to the DD at region termination are accumulated by the IMS region controller whether they are output or not), it is normally worthwhile putting this in all batch jobs.
- Running the DB monitor on a batch job, to collect similar details to the IMS monitor in an online system. As there is an overhead on running this, it would normally only be turned on when specific problems are being investigated.
References
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