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Question about SMS and DB2 for space allocation for a table

 
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shootingstar
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Joined: 19 Sep 2004
Posts: 14
Topics: 11
Location: Dallas, TX
PostPosted: Wed Mar 16, 2005 10:39 pm    Post subject: Question about SMS and DB2 for space allocation for a table Reply with quote
Recently I mistakenly created a table with PRIQTY = 720 and SECQTY = 720. (actually, it was done by a program bug in an automation program). When I loaded approximately 50 million rows into the table I expected to find hundreds of small extents allocated to the dataset. However, it showed 1 extent with 1700 or so cylinders. The system is Z-os on a T-REX with 24 GB of memory, dedicated (nothing else running). I suspect SMS built the tablespace in virtual I/O space while the load was running, then got a single extent of physical space to write it out, but I don't have any evidence to support that idea.
With the automation tool we are trying to predict the space requirements for the table to less than 5% overage. If SMS will allocate the space for an exact fit that would be perfect.
Do any of you have any insights to this?
Thanks.
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