The costing for temporary storage covers the following:
In each example, n represents the number of items in the queue before it is deleted.
WRITEQ | REWRITE | READQ | DELETEQ |
---|---|---|---|
1.0 | 0.8 | 0.8 | 0.71 + 0.23 * n |
The approximations for auxiliary TS queues do not include any VSAM I/O cost. A VSAM I/O costs approximately 11.5K instructions and will occur as follows:
Therefore, under certain circumstances, a READQ could incur the cost of two VSAM I/Os.
WRITEQ | REWRITE | READQ | DELETEQ |
---|---|---|---|
1.3 | 1.8 | 1.0 | 0.75 + 0.18 * n |
WRITEQ | REWRITE | READQ | DELETEQ |
---|---|---|---|
1.4 | 19 | 1.0 | 0.87 + 0.18 * n |
For information about performance measurements on shared temporary storage, see the System/390® MVS™ Parallel Sysplex® Performance manual.
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