Last updated on DECEMBER 06, 2016
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
Information in this document applies to any platform.
From Oracle Database Concepts 11g Release 2 (11.2) Part Number E16508-03
5 Data Integrity
Primary Key Constraints
"If a usable index exists when a primary key constraint is created, then the constraint reuses this index and does not implicitly create a new one."
How to identify if an index has been :
a) explicitly created by a user
b) has been implicitly created by oracle when a user creates a primary key constraint
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