DSNBBM
DSNBBM manages data access from the buffer pool and is part of the Buffer Manager component.
Hints
High time attributed to DSNBBM indicates movement of a large number of rows from the buffer pool to a program. Attempt to apply a more restrictive predicate to reduce the number of cross memory moves and limit the number of pages of data returned to the program.
Reference Sources
IBM Db2 for OS/390, Administration Guide, SC26-8957