Function Based Index Usages On Foreign Key Column
(Doc ID 2552176.1)
Last updated on JANUARY 30, 2020
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 and later
Information in this document applies to any platform.
Generally when we do some update on Parent table in FK relation , there is a implicit lock in child table to maintain the data consistency.
If there are index present in child table for the FK column, that index get used for the purpose.
But if no index is present, then it go for Full Table Scan.
If we have function based index instead of normal index ; will Oracle use the function based index or it will go for Full Table Scan ?
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