User getting user abend U0456 while accessing Database (Browse option) Hitting PF1 key, we get the message: The Browse process terminated with IMS User Abend 0456. The PSB being used, CAWK#000, has been stopped as a result of a previous abend. Please start PSB CAWK#000 and then retry the browse request.
if we perform an ACBLIB online change (/MODIFY PREPARE ACBLIB and /MODIFY COMMIT) the processing goes successful. We can consider this as temporary solution for this issue.
The issue may be because of this reason --> If a dynamic PSB is added to a concatenation of ACBLIB that causes the data set to be expanded to a secondary extent, that PSB is unavailable to the online system until the ACBLIB is closed and reopened by IMS.
One thing that could be pointed out is that you don't have to use the dynamic ACB feature. Any IMS database can be accessed via a static PSB/ACB. With that, the problem goes away.
If you really want to use the dynamic ACB feature, there's nothing FMIMS can do when a dynamic ACB library runs into a secondary extent.