| From: | Markus Schaber <schabi(at)logix-tt(dot)com> |
|---|---|
| To: | Aaron Turner <synfinatic(at)gmail(dot)com> |
| Cc: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>, "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: 10+hrs vs 15min because of just one index |
| Date: | 2006-02-12 21:04:18 |
| Message-ID: | 43EFA2D2.1050609@logix-tt.com |
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| Thread: | |
| Lists: | pgsql-performance |
Hi, Aaron,
Aaron Turner wrote:
> 4) Does decoding the data (currently base64) and storing the binary
> data improve the distribution of the index, thereby masking it more
> efficent?
Yes, but then you should not use varchar, but a bytea.
If your data is some numer internally, numeric or decimal may be even
better.
If most of your data is different in the first 8 bytes, it may also make
sense to duplicate them into a bigint, and create the bigint on them.
Then you can use AND in your query to test for the 8 bytes (uses index)
and the bytea. Ugly, but may work.
HTH,
Markus
--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS
Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org
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