Gene Gurevich wrote: > > Hi all: > > Is there a way for me to see how many blocks under > the HWM are unused? > > thanks > > Gene > > =====
I once wrote something which was querying USER_EXTENTS, building for each block a rowid to match row 1; the idea was to execute a SELECT to get the corresponding row, and, in case of error (NOT no data found, I can't remember the exact number) decide that the block was empty. I first wrote this on Oracle 6 to find the HWM (there was no ANALYZE then) by running a kind of dichotomic search. It was fast and reasonably precise (in fact, much more than the first versions of ANALYZE ... ESTIMATE). I guess that a variation on the same idea could be used in your case. -- Regards, Stephane Faroult Oriole Ltd -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane Faroult 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).
