RE: Statistical sampling and representative stats collection

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: elkinsl_at_flash.net

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: 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).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Nicoll, Iain (Calanais)
  INET: iain.nicoll_at_calanais.com

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: 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).