Gurelei Are the parameter's the same ?
sort* hash* *pool* db* Gurelei wrote: >Hi. > >I have executed an explain plan on a dev and prod >databases. Both databases have the same data, use the >same version of ORacle (8.1.7.0) and the same OS (AIX >4.3.3). All the tables are analyzed. The plans however >are somewhat different (below). What could explan the >differences? For example, index usage (one plan uses >an index to get to all the data, another - access the >index and then the table). All the indices are the >same on both databases. when I tried to force ORacle >to use the indices with hints, the cost grew from 322 >to 566. MY concernt is that I may not be able to tune >a query if I can't replicate the explain plan exactly >in dev as it is in production. > >Thanks for any input > >Gene > >0-0-3211.321 SELECT STATEMENT SQL1 Cost = 321 >1-0-1 2.1 SORT GROUP BY >2-1-1 3.1 NESTED LOOPS >3-2-1 4.1 HASH JOIN OUTER >4-3-1 5.1 HASH JOIN OUTER >5-4-1 6.1 HASH JOIN >6-5-1 7.1 TABLE ACCESS FULL TELESLS_EMPL >7-5-2 7.2 INDEX RANGE SCAN TS_EMP_HST_ALT1 UNIQUE >8-4-2 6.2 INDEX FAST FULL SCAN PERF_STATS_ALT1 >UNIQUE >9-3-2 5.2 INDEX FAST FULL SCAN PRDCT_STAT_ALT1 >UNIQUE >10-2-2 4.2 INDEX UNIQUE SCAN ORG_UNT_HST_PK UNIQUE > >vs > >0-0-3231.323 SELECT STATEMENT SQL1 Cost = 323 >1-0-1 2.1 SORT GROUP BY >2-1-1 3.1 NESTED LOOPS OUTER >3-2-1 4.1 NESTED LOOPS OUTER >4-3-1 5.1 NESTED LOOPS >5-4-1 6.1 HASH JOIN >6-5-1 7.1 TABLE ACCESS FULL TELESLS_EMPL >7-5-2 7.2 INDEX RANGE SCAN TS_EMP_HST_ALT1 UNIQUE >8-4-2 6.2 INDEX UNIQUE SCAN ORG_UNT_HST_PK UNIQUE >9-3-2 5.2 TABLE ACCESS BY INDEX ROWID PERF_STATS >10-9-1 6.1 INDEX RANGE SCAN PERF_STATS_FK2_X >NON-UNIQUE >11-2-2 4.2 TABLE ACCESS BY INDEX ROWID PRDCT_STATS >12-11-1 5.1 INDEX RANGE SCAN PRDCT_STAT_FK1_X >NON-UNIQUE > > >__________________________________________________ >Do You Yahoo!? >Yahoo! - Official partner of 2002 FIFA World Cup >http://fifaworldcup.yahoo.com > > -- /regards Peter Gram Mobil : +45 2527 7107 Fax : +45 4466 8856 Miracle A/S Kratvej 2 2760 Måløv http://miracleas.dk /* The process of preparing programs for a digital computer is especially attractive, not only because it can be economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music Donald Knuth */
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