Part I: http://www.oracle.com/technetwork/es/articles/database-performance/client-failover-standby-database-2660858-esa.html
It is my first article published on OTN Latina after awarded Oracle ACE.
Also you can watch video tutorial in this topic:
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Time has always been an important dimension for data in any database with topics like when was data created, when are records valid, how did records evolve over time, can we compare with yesteryear or even travel through time and data. The Oracle Database 12c release added a number of features in this area of time and history. The powerful Flashback mechanism is enhanced in many ways, such as to allow history to be constructed, (more...)