| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | "sangeetha k(dot)s" <sangeethakss(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: doubts |
| Date: | 2007-01-08 16:12:00 |
| Message-ID: | 20070108161200.GG14193@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-general |
sangeetha k.s wrote:
> hello,
>
> postgresql uses bitmap indexing for indexing in databases.
> *Is there any technique used*
> * used to compress the bitmap indices in postgresql*,like oracle that uses
> Byte Aligned bitmap compression to compress bitmaps.
Postgres does not support bitmap indexes yet. What it does support is
bitmap index *scanning*. And yes, there is a lossy compression method
that is sometimes used.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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