> working with some folks who are frightened by anti-joins Last Halloween I went as an anti-join. It was pretty scary.
Harrison: "Performance from the hash antijoin was dramatically better than for any other [anti-join optimization] method we tried. ... To take advantage of Oracle's antijoin optimizations, the following must be true: - CBO optimization must be enabled - Antijoin columns must not be NULL, because of the table definition or a not null clause in the SQL - The subquery is not correlated - The parent query does not contain an OR clause - The db parm ALWAYS_ANTI_JOIN is set to MERGE or HASH, or a MERGE_AJ or HASH_AJ hint is in the subquery" -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Greg Moore 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).
