ORA-00001 unique constraint (%s.%s) violated

Cause: An UPDATE or INSERT statement attempted to insert a duplicate key. For Trusted Oracle configured in DBMS MAC mode, you may see this message if a duplicate entry exists at a different level. Action: Either remove the unique restriction or do not insert the key.

Oracle Books

This post is to share the links for Oracle books for better understanding of Oracle Internals and other exam guides to prepare for Oracle exam. Oracle 12c Books:- OCP Upgrade to Oracle Database 12c Exam Guide (Exam 1Z0-060) OCA/OCP Oracle Database 12c All-in-One Exam Guide (Exams 1Z0-061, 1Z0-062, & 1Z0-063) OCA Oracle Database 12c Installation…