| From: | Jonathan Vanasco <postgres(at)2xlp(dot)com> |
|---|---|
| To: | "pgsql-general(at)postgresql(dot)org general" <pgsql-general(at)postgresql(dot)org> |
| Cc: | Misa Simic <misa(dot)simic(at)gmail(dot)com> |
| Subject: | Re: improving speed of query that uses a multi-column "filter" ? |
| Date: | 2014-10-01 16:12:33 |
| Message-ID: | 657A6E9C-53C7-4A79-A22C-D13CE3954FB9@2xlp.com |
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| Lists: | pgsql-general |
On Oct 1, 2014, at 12:34 AM, Misa Simic wrote:
> Have you considered maybe partial indexes?
>
> http://www.postgresql.org/docs/9.3/static/indexes-partial.html
>
> I.e idx1 on pk column of the table with where inside index exactly the same as your first where
>
> Idx2 on pk column with where inside index as second where
That was actually my first attempt , and I was hoping it would work.
Unfortunately, there is always something in the queries that keeps Postgres trying to use other (slower) indexes or jumping to a sequential scan.
I haven't been able to trick the planner into using the partial index, and most online resources suggested it wasn't possible.
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