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.