On Apr 1, 2006, at 12:51 PM, Brendan Duddridge wrote:
from SELECT * FROM pg_stats WHERE tablename='table' AND
attname='category_id'
I find correlation on category_product for category_id is 0.643703
Would setting the index on category_id to be clustered help with this?
It would absolutely help on the query in question. In my experience,
a correlation of 0.64 is too low to allow an index scan to be used
for anything but a tiny number of rows.
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Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED]
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