今天在手工配置Oracle11g的EM时总是报如下错误：
WARNING:ORA-00001:uniqueconstraint(SYSMAN.PARAMETERS_PRIMARY_KEY)violated
ORA-06512:at"SYSMAN.EMD_LOADER",line4986
ORA-06512:atline1
以Metalink上也没有找到解决办法，以下是我的解决过程：

1、数据库版本
SQL>select*fromv$version;
BANNER
------------------------------------------------------------------------------------------------------------------------------
OracleDatabase11gEnterpriseEditionRelease11.2.0.3.0-64bitProduction
PL/SQLRelease11.2.0.3.0-Production
CORE11.2.0.3.0Production
TNSforLinux:Version11.2.0.3.0-Production
NLSRTLVersion11.2.0.3.0–Production

2、配置EM时的步骤
[oracle@Core-Nbu-Rollback~]$emca-configdbcontroldb-reposrecreate
STARTEDEMCAatNov23,20123:52:08PM
EMConfigurationAssistant,Version11.2.0.3.0Production
Copyright(c)2003,2011,Oracle.Allrightsreserved.
Enterthefollowinginformation:
DatabaseSID:test
DatabaseControlisalreadyconfiguredforthedatabasetest
YouhavechosentoconfigureDatabaseControlformanagingthedatabasetest
Thiswillremovetheexistingconfigurationandthedefaultsettingsandperform.afreshconfiguration
----------------------------------------------------------------------
WARNING:Whilerepositoryisdroppedthedatabasewillbeputinquiescemode.
----------------------------------------------------------------------
Doyouwishtocontinue?[yes(Y)/no(N)]:Y
ListenerORACLE_HOME[/soft/ora11g/11202]:
PasswordforSYSuser:
PasswordforDBSNMPuser:
PasswordforSYSMANuser:
Emailaddressfornotifications(optional):
OutgoingMail(SMTP)serverfornotifications(optional):
-----------------------------------------------------------------
Youhavespecifiedthefollowingsettings
DatabaseORACLE_HOME................/soft/ora11g/11202
Localhostname................Core-Nbu-Rollback
ListenerORACLE_HOME................/soft/ora11g/11202
Listenerportnumber................1521
DatabaseSID................test
Emailaddressfornotifications...............
OutgoingMail(SMTP)serverfornotifications...............
-----------------------------------------------------------------
----------------------------------------------------------------------
WARNING:Whilerepositoryisdroppedthedatabasewillbeputinquiescemode.
----------------------------------------------------------------------
Doyouwishtocontinue?[yes(Y)/no(N)]:Y
Nov23,20123:52:33PMoracle.sysman.emcp.EMConfigperform
INFO:Thisoperationisbeingloggedat/soft/ora11g/cfgtoollogs/emca/test/emca_2012_11_23_15_52_07.log.
Nov23,20123:52:35PMoracle.sysman.emcp.util.DBControlUtilstopOMS
INFO:StoppingDatabaseControl(thismaytakeawhile)...
Nov23,20123:52:56PMoracle.sysman.emcp.EMReposConfiginvoke
INFO:DroppingtheEMrepository(thismaytakeawhile)...
Nov23,20123:54:56PMoracle.sysman.emcp.EMReposConfiginvoke
INFO:Repositorysuccessfullydropped
Nov23,20123:54:57PMoracle.sysman.emcp.EMReposConfigcreateRepository
INFO:CreatingtheEMrepository(thismaytakeawhile)...
Nov23,20123:57:30PMoracle.sysman.emcp.EMReposConfigcreateRepository
WARNING:ORA-00001:uniqueconstraint(SYSMAN.PARAMETERS_PRIMARY_KEY)violated
ORA-06512:at"SYSMAN.EMD_LOADER",line4986
ORA-06512:atline1
Nov23,20123:57:30PMoracle.sysman.emcp.EMReposConfiginvoke
SEVERE:Errorcreatingtherepository
Nov23,20123:57:30PMoracle.sysman.emcp.EMReposConfiginvoke
INFO:Refertothelogfileat/soft/ora11g/cfgtoollogs/emca/test/emca_repos_create_<date>.logformoredetails.
Nov23,20123:57:30PMoracle.sysman.emcp.EMConfigperform
SEVERE:Errorcreatingtherepository
Refertothelogfileat/soft/ora11g/cfgtoollogs/emca/test/emca_2012_11_23_15_52_07.logformoredetails.
Couldnotcompletetheconfiguration.Refertothelogfileat/soft/ora11g/cfgtoollogs/emca/test/emca_2012_11_23_15_52_07.logformoredetails.