Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved


Chapter 4 Understanding Journal Processing : Merging Journal Data in Accumulation Data Sets

Merging Journal Data in Accumulation Data Sets
Merging Behavior
After the journal offload job step (S6BSPJEX), the SPIN procedure invokes the S6BSPDSN (Determine Number of GDGs) utility to determine how many generations exist in the journal accumulation generation data group. If the spin limit is exceeded, as specified by the $SPINLIM$ OSEMOD installation variable, the SPIN procedure submits the SPINMRG job, using IEBGENER, that merges all existing journal accumulation files into a single generation.
See Also
TIBCO Object Service Broker for z/OS Installing and Operating for details on the $SPINLIM$ OSEMOD installation variable.
Merging Data in the Accumulation Data Sets
SPINMRG Functionality
The SPINMRG job does the following:
1.
2.
3.
Adjusting the Spin Limit
You can adjust the threshold at which point journal accumulation is triggered according to the following criteria:
DASD availability. For example, to reduce the amount of disk space taken up by journal accumulation data sets, reduce the threshold number accordingly.
The importance of the data and your requirements for immediate recovery. For example, if your data is extremely critical, you can merge your journal accumulation files together after every generation is written, and then merge your master accumulation with your latest backup several times a day.

Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved