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Alex Rivera
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I'm currenly developing on Oracle. I have several tables for which I defined FOREIGN KEY constraints. I have already read this SQL Server -oriented and this MySQL -oriented questions but I could find none about Oracle. So the question is always the same: in order to optimize query performance, for those columns for which I create a FOREIGN KEY constraint, do I also have to create an explicit secondary index? Doesn't Oracle automatically create an index on FOREIGN KEYed columns to boost performances during JOINs? I usually perform queries in which the WHERE clause compare against those columns.
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