am Tue, dem 17.10.2006, um 17:09:29 +0530 mailte soni de folgendes:
> I didn't understand the "Bitmap Scan" and the sentence "indexes will be
> dynamically converted to bitmaps in memory". What does mean by "Bitmap Scan" in
> database?
For instance, you have a large table with 5 indexes on this and a query
that checks conditions on this 5 columns.
PG is now able to combine this 5 indexes and performs only 1 bitmap
index scan on this table, and not 5 independet nested bitmap scans.
A realy very great performance-boost!
HTH, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47215, D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
