Using a history data space
This feature enables you to have temporary access to data from the online views without having to allocate disk storage and this is intended for test IBM CICS regions or other configurations where the data need not be permanently saved.
The data space is defined with a maximum size parameter and a time limit parameter. The maximum size parameter determines how much space BMC AMI OpsM for CICS allocates to contain the data. The time limit parameter determines how long BMC AMI OpsM for CICS maintains the data in the data space.
When the data space becomes full, or the time limit has expired, expired data is rolled out of the data space to make space for the new data.
Generally, the T6E records for a specific task are kept in the data space until one of the following conditions is met:
- Time limit for retaining data has expired.
- Data space is full.
- Extractor in the target CICS region terminates.
- PAS is recycled.
How to control the use of a history data space
There are three options to control the use of the history data space:
- Data space: controls whether a data space is used (valid values are YES or NO)
- DSP Size: controls the size of the data space that is allocated
- DSP Minutes: controls how many minutes worth of history data is preserved in the data space
For more information about these options, see History file specification dialog fields.
Disadvantages for using a history data space
There are several disadvantages recording to the data space:
- If the data space becomes full before to the time limit expires, the data space is not expanded and data could be lost.
- Older data is rolled out of the data space in order to make room for the new data.
- T6E records placed into a data space are not recorded to a data set for future use and are not accessible for any batch reporting facility, including the BMC AMI OpsM for CICS PERFORMANCE REPORTER.