At 09:32 -0500 on 04/20/2009, Bruno Sugliani wrote about Re: DFHSM QUESTION - REORG OF MCDS:

Are you sure you want to reorg your CDS ?
I thought good practice was not to do that because you 'll end up splitting
ci/ca for inserts for few weeks, thus having performance impact.

You minimize the ci/ca split problem by defining FREESPACE in the original DEFINEs. That way you start out with the room to expand BEFORE you actually need to do the ci/ca split (ie: be in a post-ci/ca split condition).

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