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Index present, full table scan is going on - EBS 12.1

edited Apr 28, 2017 5:03AM in EBS Customizations (MOSC) 3 commentsAnswered

We have a situation where in spite of index present, full table scan is going on.What could be the possible reasons on this. We have a pl/sql code which is loading data from outside source , checking for existing data and then either inserting row or updating it. Its also happening after index rebuild , performance of the code gets better and again after few weeks it starts deteriorating and only becomes better after a fresh rebuild.

Database 11g R2.

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