更新到12c的版本需求（摘自官方文檔）

1.更新到12c release 1

Step 1: Upgrade Path for Oracle Database to Oracle 12c Release 1 (12.1) Minimum version of the database that can be directly upgraded to Oracle 12c Release 1 (12.1) Source Database Target Database 10.2.0.5 12.1.x 11.1.0.7 12.1.x 11.2.0.2 or higher 12.1.x The following database versions will require an indirect upgrade path: Source Database Intermediate Upgrade Path for Target Database Target Database 11.2.0.1 ----> 11.2.0.2 or higher ----> 12.1.x 11.1.0.6 ----> 11.1.0.7 or 11.2.0.2 or higher ----> 12.1.x 10.2.0.4 (or earlier) ---->  10.2.0.5 or later direct upgrade version ----> 12.1.x 10.1.0.5 (or earlier) ----> 10.2.0.5 or later direct upgrade version ----> 12.1.x 9.2.0.8 (or earlier) ---->   9.2.0.8 --> 11.2.0.2 or higher ----> 12.1.x 2.更新到12c release 2 Minimum version of the database that can be directly upgraded to Oracle 12c Release 1 (12.2) Source Database Target Database 11.2.0.3 / 11.2.0.4 12.2.x 12.1.0.1 / 12.1.0.2 12.2.x Intermediate upgrades needs to be carried for following releases Source Database Intermediate upgrade path Target database 11.2.0.1 / 11.2.0.2 --> 11.2.0.4 --> 12.2.x 11.1.0.6 / 11.1.0.7 --> 11.2.0.4 --> 12.2.x 10.2.0.2/10.2.0.3/10.2.0.4/10.2.0.5 --> 11.2.0.4 / 12.1.0.2 --> 12.2.x 10.1.0.5 --> 11.2.0.4 / 12.1.0.2 --> 12.2.x 9.2.0.8 --> 11.2.0.3 / 11.2.0.4 --> 12.2.x For example