cf_gbp_sz - Group buffer pool configuration parameter

This parameter determines the memory size used by the cluster caching facility, also known as CF, for group buffer pool (GBP) usage for this database.

Configuration type
Applies to
Applies to a Db2® pureScale® instance only.
  • Database server with local and remote clients
  • Client
  • Database server with local clients
Parameter type
Configurable online
Default [range]
AUTOMATIC [AUTOMATIC, 4096 - 4294967296]
Unit of measure
Pages (4 KB)
When allocated
When the database is first connected or activated on any Db2 member
When freed
When the database is deactivated on the last Db2 member

There are two main types of resources in the GBP, directory entries and data elements. A directory entry stores metadata information pertaining to a page. A data element stores the actual page data.

Db2 members continue to cache pages in their own local buffer pools. The GBP is used only by the local buffer managers to maintain intersystem buffer coherency and cannot be directly referenced by Db2 EDUs running on any Db2 member.