Starting with version 11gR1 Oracle database uses native FULL JOIN implementation based on HASH JOIN whenever possible. It’s good to know that this functionality first appeared in Oracle 10.2.0.3 and could be used to overcome different issues, including performance and bugs. Here is an example appeared on the SQL.ru recently:
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10.2.0.3 10.2.0.4 10.2.0.5 10g 10gR2 11.2.0.1 11.2.0.2 11.2.0.3 11g 11gR2 ANSI SQL ASH AWR benchmark bind peeking bug bug-or-feature CBQT coalesce coalesce subquery collections conferences connect by control files docs dynamic views EBR Exadata fail FBI Firefox full join funny stuff Hotsos indexes iPX ITL javelin JNI join elimination join factorization memory merge MOS muxers nested loops OIC OICA OOM optimizer_features_enable opt_param ORA-04031 Oracle JVM outer join PDML poll presentations PX RAC scripts shared cursors SPECjAppServer2004 sql_trace statistics Statspack subqueries subquery factoring subquery unnesting Sun Tom Kyte tpt trace files undocumented wait events wish list -
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