DSNB800I   DIRECTORY ENTRY TO DATA PAGE RATIO SET TO value FOR gbpname. IT WILL TAKE EFFECT ON THE NEXT REALLOCATION

This message is issued in response to an ALTER GROUPBUFFERPOOL command that requests a change to the directory entry to the data page ratio for a group buffer pool. It is also issued for the first ALTER GROUPBUFFERPOOL command for a group buffer pool, even when no ratio value is specified on the command (in this case, the default ratio value is being used). The new ratio takes effect the next time the coupling facility cache structure is allocated.

The directory entry to data page ratio determines the number of directory entries and the number of data pages that are allocated in the coupling facility cache structure for the group buffer pool. If the coupling facility structure is not allocated, the first connect from any DB2® causes allocation of the structure and the new directory entry to data page ratio to take effect.

If the structure size can be determined from the MVS™ CFRM administrative policy, message DSNB801I is issued to indicate an estimate of the number of directory and data entries that are allocated based on the new ratio and the current size of the coupling facility structure. Otherwise, message DSNB812I is issued.