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_optimizer_extend_jppd_view_types tips

Oracle Tips by Burleson Consulting

January 27, 2013

Question What is the _optimizer_extend_jppd_view_types undocumented hint do?

Answer:  There are some bug involved in 11g r2, and are fix by setting this parameter to false.

The jpp in _optimizer_extend_jppd_view_types tips stands for "join predicate pushing" and this hint is a way to push a predicate into a view.  This can be a traditional view or an "in-line" view.

The downside to re-usable code is that where clause predicates must be "pushed" down the hierarchy of views, down to the base query. This adds processing overhead to the optimizer and increases the chances of a bad execution plan.

Prior to the introduction of this parameter in 11g, Oracle would not control predicate pushing for complex queries with group by, anti joins, semi joins and select distinct operations.  When this happens a 10053 trace will show:

JPPD:   Checking validity of push-down from SEL$1 (#1) to SEL$2 (#2)
JPPD:     JPPD bypassed: View contains a group by.

These restrictions are overcome in 11g.  Also note that _optimizer_extend_jppd_view_types only applies to subqueries that use nested loops access.  The push_pred hint controls predicate pushing and it is related to the _optimizer_extend_jppd_view_types parameter. 


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