On Wed, 2 Oct 2013 09:12:02 -0400, Bill Moran <wmoran@xxxxxxxxxxxxxxxxx> wrote: > Last I looked, the partitioning mechanism isn't _quite_ as smart as could > be desired. For example: > SELECT * FROM table WHERE objnum = 5; -- will not take advantage of partition > You have to give the planner a little more hint as to the fact that it can > take advantage of the partition: > SELECT * FROM table WHERE (objnum % 2) = 1 AND objnum = 5; > As silly as it seems, this is enough information for the planner to know > that it only needs to scan one partition. This seemed ridiculously silly until I thought about it. I guess it has no way of "unwrapping" my constraint and figuring out what to do. Would this also apply if I did ranges or is that a common enough constraint that it *can* figure it out without me having to modify all my queries?
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