日志：

Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMReposConfig createRepositoryCONFIG: ORA-20001: SYSMAN already exists..ORA-06512: at line 17oracle.sysman.assistants.util.sqlEngine.SQLFatalErrorException: ORA-20001: SYSMAN already exists..ORA-06512: at line 17        at oracle.sysman.assistants.util.sqlEngine.SQLEngine.executeImpl(SQLEngine.java:1650)        at oracle.sysman.assistants.util.sqlEngine.SQLEngine.executeScript(SQLEngine.java:1000)        at oracle.sysman.assistants.util.sqlEngine.SQLPlusEngine.executeScript(SQLPlusEngine.java:339)        at oracle.sysman.assistants.util.sqlEngine.SQLPlusEngine.executeScript(SQLPlusEngine.java:380)        at oracle.sysman.emcp.EMReposConfig.createRepository(EMReposConfig.java:510)        at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:228)        at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:157)        at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:253)        at oracle.sysman.emcp.EMConfigAssistant.invokeEMCA(EMConfigAssistant.java:589)        at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1448)        at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:573)        at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:521)Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMReposConfig invokeSEVERE: Error creating the repositoryApr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMReposConfig invokeINFO: Refer to the log file at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_repos_create_
     
      .log for more details.Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMConfig performSEVERE: Error creating the repositoryRefer to the log file at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2015_04_04_22_07_40.log for more details.Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMConfig performCONFIG: Stack Trace: oracle.sysman.emcp.exception.EMConfigException: Error creating the repository        at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:240)        at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:157)        at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:253)        at oracle.sysman.emcp.EMConfigAssistant.invokeEMCA(EMConfigAssistant.java:589)        at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1448)        at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:573)        at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:521)Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMConfig restoreOuiLocCONFIG: Restoring oracle.installer.oui_loc to /u01/app/oracle/product/11.2.0.1/db_1/oui
     

处理方法：

1、使用emca -deconfig dbcontrol db命令删除配置

2、使用emca -repos drop删除repository

3、使用emca -config dbcontrol db -repos create 

如果还报其它错，则按如下步骤操作：

Logon SQLPLUS as user SYS or SYSTEM, and drop the sysman account and management objects:

                  SQL> drop user sysman cascade;

                  SQL> drop role MGMT_USER;

                  SQL> drop user MGMT_VIEW cascade;

                  SQL> drop public synonym MGMT_TARGET_BLACKOUTS;

                  SQL> drop public synonym SETEMVIEWUSERCONTEXT;

 

[oracle@rhel201 ~]$ emca -config dbcontrol db -repos create  （创建资料库和dbcontrol）

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……

Enterprise Manager configuration completed successfully

FINISHED EMCA at Apr 4, 2015 10:25:41 PM