DSNB1CLM
DSNB1CLM is part of the CLAIM processing used to replace Lock processing. It is called to write the parameter list for the CLAIM.
Hints
CLAIM processing shows up quite a bit, but is no where as pernicious as Lock processing. Unless the program appears to be delayed because of CLAIM activity, this should be treated as expected overhead.
Reference Sources
IBM Db2 for OS/390, Messages and Codes, GC26-8979
IBM Db2 for OS/390, Application Programming and SQL Guide, SC26-8958
IBM Db2 for OS/390, Administration Guide, SC26-8957