12c是Oracle未来最重量级的数据库产品，每个新版本的到来都会带来吐故纳新，例如9i的sqlplusw、10g的isqlplus均在其后续版本中废弃；12c中将被废弃或不支持的特性，例如:Database Control DBconsole、OCFS on Windows、CSSCAN、CSALTER、cursor_sharing = 'SIMILAR'、Oracle Net Connection Pooling feature。 为了照顾旧应用的兼容性，看来在12c中暂时不会彻底废掉RBO。
更多信息可以参考以下NOTE:
Deprecated and Desupported Features after Oracle Database 11.2:
Document 1484775.1 Database Control To Be Desupported in DB Releases after 11.2
Document 1392280.1 Desupport of Oracle Cluster File System (OCFS) on Windows with Oracle DB 12
Document 1175293.1 Obsolescence Notice: Oracle COM Automation
Document 1175303.1 Obsolescence Notice: Oracle Objects for OLE
Document 1175297.1 Obsolescence Notice: Oracle Counters for Windows Performance Monitor
Document 1418321.1 CSSCAN and CSALTER To Be Desupported After DB 11.2
Document 1169017.1 Deprecating the cursor_sharing = 'SIMILAR' setting
Document 1469466.1: Deprecation of Oracle Net Connection Pooling feature in Oracle Database 11g Release 2