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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on Dec 8, 2023

Allow to ALTER (and CREATE) a Db2 pageset with the max allowable size

The current maximum for PRIQTY is 64GB.

If one wants to avoid extent processing in z/OS and has pagesets larger than 64GB, there is no option (besides user-defined pagesets) to achieve this.

By using IAG2 we encountered the fact that IAG2 is sometimes disabled during z/OS extent processing. To avoid this disablement we want to define the pagesets up to their maximum of 1TB, but were not able to do this.

And independent of our IAG2 use case, this requested enhancement has benefit for others who know the pageset size of their application and fill the pagesets up very quickly with insert/load processing and want to avoid the additional overhead of z/OS extent processing.

For us especially the ALTER is important as we have 2048k partitions. Of course not all partitions are filled up at a given point in time, so we only want to prepare the pagesets which are next in the sequence to be filled up by insert processing. This can be done by ALTER the PRIQTY and a "dummy" REORG on the partition to allocate the pageset with its maximum size of 1TB.

Needed By Quarter