官方资料:[英文]白皮书:Upgrading to Oracle Database 12c 升级到ORACLE12c (12.1.0.2).pdf

官方资料：[英文]白皮书：Upgrading to Oracle Database 12c (12.1.0.2)升级到ORACLE12c (12.1.0.2) Comparing Upgrade and Migration；Database Upgrade；Database Migration.；Multitenant Architecture；Selecting a Database Upgrade or Migration Method；Direct Upgrade to Oracle Database 12c；Upgrade and Migration Methods；Detailed