I am working with an 8.1.6 database on Solaris 2.6 and I am wondering if
there is any consistency in the optimizer. We have two nearly identical
databases (one a clone from two weeks ago). A five table join has nearly the
identical execution plan on the two databases. The difference is in the
access method of the fourth table in the join; in one case it is accessed by
a FTS and in the other, by Index. This difference has a large effect on
performance. Statistics are nearly identical for this table in both
databases (I looked at dba_tables, dba_indexes, dba_col_tables). Also, the
init.ora is the same. When I changed the optimizer_mode to rule and added a
'choose' hint to the query, the execution plan was different again. I will
look into this a bit further and post my results. Just wondering about
other's experiences. Thanks.
Henry
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Author: Henry Poras
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