Yes, we have noticed significant response problems after upgrading from 8.0.5 to 8.1.7.4 using FIRST_ROWS. It seems that something new in 8i is affecting onwards affects the performance.
For example we have a standard DBA script to collect information on extents against a specified user/table and response went up to 282 seconds. Inserting the RULE hint in the script returned the response time back to it's normal 3 seconds. Not had time to investigate but there are obviously some implications here with FIRST_ROWS. Lewis Bishop --- Barclays Enable - ISS - E-NTRUST/Bexleyheath NT Oracle Database Consultant Watling Street, Bexleyheath, Kent, DA6 7RR (Mail Van R) Phone : 020 8298 3418 Mobile: 07950 380857 Email : [EMAIL PROTECTED] "Enabling Competitive Advantage for Barclays in IT and Business Processing" -----Original Message----- Sent: 30 October 2002 17:19 To: Multiple recipients of list ORACLE-L We have an OLTP system that I thought will benefit from first rows. The sad fact is that when I set optimization to first rows the response sucks. Do some testing, as you can change this anytime. Yechiel Adar Mehish ----- Original Message ----- To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Sent: Tuesday, October 29, 2002 11:13 PM > We're moving from RBO to CBO. > > For those of you who use CBO, what mode do you use FIRST_ROWS or ALL_ROWS? > And why? > > My thinking is if it's a database where most of the querying is done on > small sets of records, then we may want to use FIRST_ROWS. On the other > hand, if our database is used to generate sizable reports, we might use > ALL_ROWS. > > I also understand that we can always change it per session (with alter > session) and per query (with hints). > > Michael Armstead > Principal Database Administrator, OCP-Certified > World Wide Corporate IT Database Administration > GlaxoSmithKline > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Armstead, Michael A > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > 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: Yechiel Adar INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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: Bishop Lewis INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
