RE: bitmap indices

From: Ganesh Raja <ganesh_at_gtfs-gulf.com>
Date: Mon, 29 Apr 2002 05:18:52 -0800
Message-ID: <F001.00451B5C.20020429051852@fatcity.com>

Hope you are using the CBO and not the RBO. If yu use a Bitmap Index then the Optimizer will use a CBO and if the stats are not proper then u may not get a Proper Result.

HTH Best Regards,
Ganesh R

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-----Original Message-----
Sent: Monday, April 29, 2002 4:43 PM
To: Multiple recipients of list ORACLE-L

hi!

to speed up queries i have created a bitmap index on a column that contains 2 chars as a maximum. to my surprise the bitmap index does not make the query quicker than the 'usual' B-tree index, though there are only bout 100 different values in
half a million rows.

has n.e.one got experience with bitmap indices? are there any further poosibilities to adapt them when creating???

tia & bye

daniel
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Author: Daniel Wisser
  INET: daniel.wisser_at_isis-papyrus.com

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Author: Ganesh Raja
  INET: ganesh_at_gtfs-gulf.com

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To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Mon Apr 29 2002 - 08:18:52 CDT