In the process of learning and working with Oracle I have found one very interesting document about Oracle 's decision- books OCM Oracle Database 11g Administrator Certified Master Exam Guide

I have ordered and I saw this after reading the excellent materials , manuals detail the technical characteristics + detailed step by step to configure almost all of the commonly used Oracle's service as :

Managing Database Availability
Data Management
Data Warehouse Management
Peformance Management
RAC
Data Guard

Currently there are editions for Oracle DBMS is spending most common is 10G , 11G ( G : Grid , the Grid Computing research , HA and load balancing features such as RAC , Grid Control , Data Guard ) , 12c ( C : Cloud and support multiple databases in one instance , peformance ... )

The version I saw was this general use 1 core , how to configure virtually unchanged , only adding new features such as pluggable Oracle databases 12C ( equivalent to multi instance install on the 10G and 11G ) , PGA_AGGREGATE_LIMIT , Role CDB Administrator ...