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Archives of the TeradataForum
Message Posted: Tue, 21 Mar 2006 @ 12:47:21 GMT
| Subj: | | Re: Performance issue on a huge table.. |
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| From: | | OHara, Daniel |
Hi Victor,
| | Having said that, I would probably tend to think that we do not "need" to do things like that, the optimizer should probably select the
appropriate PI values before copying the data to the spool file. Don't know whether you agree with this." | |
Even if the optimizer only stores the PI in spool it will still have to read all the blocks from the full table. The Disc I/O saved in reading
a table/index only containing PIs may still be beneficial.
Daniel
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