升级到Oracle 18c的路径

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Minimum version of the database that can be directly upgraded to Oracle 18.1

Upgrade MatrixSourceTarget
11.2.0.3/11.2.0.418.1
12.1.0.1/12.1.0.218.1
12.2.0.118.1

Intermediate upgrades needs to be carried for following releases

Indirect Upgrade MatrixSource Database Intermediate upgrade path Target database
11.2.0.1/11.2.0.2-->11.2.0.3/11.2.0.4-->18.1
11.1.0.6/11.1.0.7-->11.2.0.3/11.2.0.4-->18.1
10.2.0.2, 10.2.0.3, 10.2.0.4, 10.2.0.5-->11.2.0.3/11.2.0.4/12.1.0.1/12.1.0.2-->18.1
10.1.0.5-->11.2.0.3/11.2.0.4/12.1.0.1/12.1.0.2-->18.1
9.2.0.8 or earlier-->11.2.0.3/11.2.0.4-->18.1

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具体参见 ：
Oracle DB 18c - Complete Checklist for Manual Upgrades to Non-CDB Oracle Database 18c (Doc ID 2418045.1)

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Oracle 18c - Complete Checklist for upgrading Oracle 12.x Container Database (CDB) to Oracle Database 18c (18.x) using DBUA (Doc ID 2421552.1)

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Oracle 18c - Complete Checklist for Upgrading to Oracle Database 18c (18.x) using DBUA (Doc ID 2418576.1)

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Master Note For Oracle Database Upgrades and Migrations (Doc ID 1152016.1)