数据库要安装新的补丁，发现新补丁中的某些包和原有补丁冲突，需要将原有补丁进行回退。
1、进行新补丁安装前的冲突检查，发现与原有补丁冲突。
[oracle@PJKMISDB patch]$ cd 20760982/
[oracle@PJKMISDB 20760982]$ /u01/app/oracle/product/11.2.0/db_1/OPatch/opatch prereq CheckConflictAgainstOHWithDetail -ph ./
Oracle Interim Patch Installer version 11.2.0.3.6
Copyright (c) 2013, Oracle Corporation.  All rights reserved.
PREREQ session
Oracle Home       : /u01/app/oracle/product/11.2.0/db_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/oracle/product/11.2.0/db_1/oraInst.loc
OPatch version    : 11.2.0.3.6
OUI version       : 11.2.0.3.0
Log file location : /u01/app/oracle/product/11.2.0/db_1/cfgtoollogs/opatch/opatch3015-11-23_16-11-26PM_1.log
Invoking prereq "checkconflictagainstohwithdetail"
ZOP-40: The patch(es) has conflicts with other patches installed in the Oracle Home (or) among themselves.
Prereq "checkConflictAgainstOHWithDetail" failed.
Summary of Conflict Analysis:
There are no patches that can be applied now.
Following patches have conflicts. Please contact Oracle Support and get the merged patch of the patches :
16902043, 20760982
Following patches will be rolled back from Oracle Home on application of the patches in the given list :
16902043
Conflicts/Supersets for each patch are:
Patch : 20760982
Bug Conflict with 16902043
Conflicting bugs are:
17332800
Conflict with 16619892

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