Main temporary storage: monitoring and tuning
You can monitor and control the amount of storage in the CICS® region that is used by temporary storage queues.
About this task
From CICS TS for z/OS®, Version 5.1, main temporary storage is located in 64-bit storage, so the available space is greater than in earlier CICS releases. Main temporary storage does not require VSAM I/O activity or communication with a temporary storage server. However, temporary storage queues in main temporary storage are not recoverable.
The CICS temporary storage statistics show information about the use of main temporary storage. You can also use CICSPlex® SM or CICS commands to see the amount of main temporary storage in use, and the current limit. When 75% or more of the maximum allowed storage is in use, CICS issues messages about this situation.
You use the TSMAINLIMIT system initialization parameter to specify the amount of storage in the CICS region that is available for temporary storage queues to use. You can specify an amount of storage in the range 1 - 32768 MB (32 GB).
However, you must also check the setting for the z/OS parameter MEMLIMIT. MEMLIMIT limits the amount of 64-bit storage that the CICS address space can use. Your setting for TSMAINLIMIT must not be greater than 25% of the MEMLIMIT value.
Procedure
Results
WRITEQ | REWRITE | READQ | DELETEQ |
---|---|---|---|
1.0 | 0.8 | 0.8 | 0.71 + 0.23 x n |