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How to identify the issues caused from no view push predicate/ no view merging?

edited Jun 3, 2016 7:31AM in SQL Performance (MOSC) 3 commentsAnswered

Hi All,

While tuning slow SQL some times we come across view merging not happening or view push predicate not happening.

But how to identify that a particular issue (in sql performance) is due to View merging not happening

                                                        or     due to  View Push predicate not happening.

How to distinguish between them or is there a way a to know a particular issue is because of non-view merging or because of no view push predicate.

What particular  things we see when either of them not happening?

I have gone through the oracle optimizer blog but could not identify the diff when either of them not happening:

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