oracle em启动失败--ORACLE_UNQNAME not defined

客户的服务器启动不了em

报错Environment variable ORACLE_UNQNAME not defined. Please set ORACLE_UNQNAME to database unique name.

需要做的比对

1，oracle 目录下的TNS 、LSN配置文件hostname

2，linux /etc/hosts 里的hostname

3，oracle 用户下 .bash_profile 或者是 .bashrc

能配置hostname的地方是否都一致

我出现的问题是，用户改动过hostname,oracle 下的.bash_profile 申明的hostanme 和oracle 数据库的不一致所以报错，修改一致

source .bash_profile 可以使用

如果你确认hostname 和 sid 实例名都没有错

那么建议你进行emc重建操作

$ sqlplus / as sysdba
SQL> alter user dbsnmp identified by py123456;
User altered.

SQL> drop role MGMT_USER;
Role dropped.

SQL> drop user MGMT_VIEW cascade;
User dropped.

SQL> drop user sysman cascade;
User dropped.

SQL> drop user sysman cascade;

SQL> drop PUBLIC SYNONYM MGMT_TARGET_BLACKOUTS;
Synonym dropped.

SQL> drop public synonym SETEMVIEWUSERCONTEXT;
Synonym dropped.
SQL>quit

$ emca -config dbcontrol db -repos create

进行创建操作

STARTED EMCA at May 26,2017 10:37:01 AM
EM Configuration Assistant,Version 11.2.0.3.0 Production
Copyright (c) 2003,2011,Oracle. All rights reserved.

Enter the following information:
Database SID: oracle11
log4j:WARN No appenders could be found for logger (emSDK.config).
log4j:WARN Please initialize the log4j system properly.
Listener port number:
Listener ORACLE_HOME [ ]:
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):

WARNING: ORA-00955: name is already used by an existing object--- 告警这个的话是配置没清除干净

使用

$ emca -config dbcontrol db -repos recreate

执行

按步骤操作

最后可以使用em

（编辑：李大同）

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