日志：
Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMReposConfig createRepository
CONFIG: ORA-20001: SYSMAN already exists..
ORA-06512: at line 17 oracle.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 invoke
SEVERE: Error creating the repository
Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Refer to the log file at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_repos_create_<date>.log for more details.
Apr 4, 2015 10:08:09 PM oracle.sysman.emcp.EMConfig perform
SEVERE: Error creating the repository
Refer 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 perform
CONFIG: 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 restoreOuiLoc
CONFIG: 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）
***********************************************************
……
Enterprise Manager configuration completed successfully
FINISHED EMCA at Apr 4, 2015 10:25:41 PM