Specifying checkpoint frequency in IMS programs

A checkpoint indicates a commit point in IMS programs. You should specify checkpoint frequency in your program in a way that allows it to easily be changed, in case the frequency that you initially specify is not appropriate.

To specify checkpoint frequency in IMS programs:

1. Use a counter in your program to keep track of one of the following items:
   • Elapsed time
   • The number of root segments that your program accesses
   • The number of updates that your program performs
2. Issue a checkpoint call after a certain time interval, number of root segments, or number of updates.