Hello everybody, One of our developers is encountering a situation where Oracle 9.0.x explain plan chooses one index when on UNIX, and chooses a different index when running on Windows NT. I'd appreciate any insights or similar experiences.
The following are the facts: 1. The explain plan is run against the same SELECT statement on both platforms 2. It has been confirmed that there are no statistics on either of the databases 3. Both databases are using RBO (not CBO) 4. The UNIX database has about 100 times as many rows (in this table) as the NT database 5. The SELECT statement that gives different explain plans on different platforms is: SELECT FN.*, FN.ROWID FROM UNITFUND FN WHERE FN.FU_CODE = :cFuCode AND FN.MKEY = :cMkey AND FN.CLNT = :sKey AND FN.PLANNO = :sKey AND FN.DATE_FROM <= :dDate AND FN.SOURCE = :cSource AND FN.TSTATUS = 'O' ORDER BY FN.DATE_FROM, FN.TSECOND; 6. Between the following 2 indexes, Oracle 9.0x chooses (2) on Unix and (1) on Windows NT. 1) clnt, mkey, planno, fu_code, date_from, source, tracode, tsecond... 2) date_from, clnt, planno, mkey, fu_code Any insights from anybody out there? Thanks. Sam Bootsma, OCP Technical Support Analyst -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Sam Bootsma 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).
