Last updated on September 28th, 2016 at 05:09 am Edition-based redefinition  in Oracle Database 11gR2 allows multiple versions of PL/SQL objects, views and synonyms in a single schema, which makes it possible to perform upgrades of database applications with zero down time. It also means we can  maintain multiple copies of the same object What is Edition in Oracle? An edition is effectively a version … Continue reading How Edition-Based Redefinition in Oracle Database 11gR2 works »