Defining OLDS buffers

You can define from 2 to 9999 OLDS buffers (the default is 5). The number of buffers can be changed during IMS restart.

You might want to increase the number of OLDS buffers in the following circumstances:

• If IMS frequently waits for OLDS buffers
• If you have a high frequency of dynamic backout

Specify the number of OLDS buffers in the BUFNO parameter on the OLDSDEF statement in the LOGGER section of the DFSDFxxx PROCLIB member.

IMS places OLDS log buffers above the 2 GB boundary only when they are allocated as DFSMS extended-format data sets and when BUFSTOR=64 is specified with the OLDSDEF statement in the LOGGER section of the DFSDFxxx IMS.PROCLIB member.