Have used them on a for all indexed columns basis and they make a massive difference on heavily skewed data - particularly a sort of waiting to be processed flag which only has about 5 distinct values but the ones we want to pick will make up only about 0.01%.
Haven't used them on all columns as we don't often filter on non-indexed columns. Iain Nicoll -----Original Message----- Sent: Wednesday, May 29, 2002 12:59 PM To: Multiple recipients of list ORACLE-L > > Based on the scarcity of previous responses to emails on this list, > it seems that histograms are not that widely used throughout the > industry. I'm not sure why. I've used them in the past, but only in very specific instances and certainly not for all tables/columns. Sometimes just 1 or 2, sometimes 15 or 20. And only in those cases where needed. > > Cherie Machler > Oracle DBA > Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Larry Elkins INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Nicoll, Iain (Calanais) INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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).
