C H A P T E R 9

Batch Processing

This chapter describes problems related to running batch jobs in Sun MTP. It contains the following topics:

Batch Processing and Recovery

Batch Search Interval

Batch Processing and Recovery

By their nature, batch programs are long running. If recovery is enabled, records remain locked until the program that is updating them issues a SYNCPOINT. This can cause users who run online transactions that update the same records to wait a long time.

If you enable recovery for batch programs, your programs should issue SYNCPOINTS at regular intervals. This commits any updates and enables other users to access the updated records. You should also write the programs so that they are restartable. In other words, on a restart, the programs must not try to update records that are already committed.

You should disable recovery for long running batch programs. Refer to the Sun Mainframe Transaction Processing Software Developer's Guide for information about disabling recovery.

Batch Search Interval

The Batch search interval field in the VCT controls how often Sun MTP inquires for batch jobs waiting to run.

In the standard batch environment, the $KIXBTCH directories are searched.

In the Sun MBM environment, the batch node is queried.

Set this field to any number of seconds from 1 to 9999. The default is 120 seconds.

Setting this field to a high value can degrade performance.