DSNB1SWS

DSNB1SWS deals with Buffer Blocks and Page Management Blocks (PMBs). It is part of the Buffer Manager code. Module DSNB1SWS is used to set the Write Intent for System Pages. These are pages that have been updated by application programs, and must be written before a Commit process can complete. The updated pages are actually moved to the Log buffers, not necessarily physically written back to the tablespaces immediately. Pages flagged for write are not available within the buffer pool. They will usually be written out in an Asynchronous manner, unless they are forced by a Checkpoint or by closing the tablespace.

Reference Sources

IBM Db2 for OS/390, Messages and Codes, GC26-8979