IMS buffer pool tuning
You can configure the IMS buffer pools to improve overall system performance.
Message queue pool tuning
The message queue pool acts as a buffer to the message queue data sets. Optimize the message queue pool to reduce unnecessary I/O activity.
Message format pool tuning
The message format buffer pool holds message format blocks for frequently used transactions. Optimizing it reduces the I/O burden of common transactions.
PSB, PSBW, and DMB pool tuning
These guidelines for the program specification block (PSB) pool, PSB work (PSBW) pool, and data management block (DMB) pool can resolve pool space failures.
Database buffer pool tuning
Allocate sufficient buffers in the IMS database buffer pools to prevent I/O that results from an application program having to reread data previously brought into the pool. Careful choice of subpool sizes and matching against database block sizes and frequency of database references minimizes unnecessary I/O.
Parent topic:
Initializing z/OS and IMS parameters for tuning