Oracle 9i/10g/11g 数据库 升级路线图（upgrade roadmap）
MOS的文档对升级路线的说明：
Complete Check list for Manual Upgrades to11gR2 [ID 837570.1]
Maclean 的Blog 上有几个更直观的图：
http://www.oracledatabase12g.com/archives/oracle-database-9i-10g-11g-r2-upgrade-roadmap.html
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转载至： https://blog.csdn.net/tianlesoftware/article/details/6729409
