Oracle 11g升级后遇到问题及解决
Oracle 11g升级后遇到问题及解决，Oracle 11gR2单机测试数据软件及库升级，操作系统Linux6.3
实验环境，Oracle 11gR2单机测试数据软件及库升级，操作系统Linux6.3
oracle版本 11.2.0.1 升级包11.2.0.3
数据库软件及库升级成功后，测试expdp导出全库实验，总是提示如下错误：
[oracle@linuxtest ~]$ expdp oracle/oracle@orcl directory=DATA_PUMP_DIR dumpfile=daochu.dmp logfile=daochu.log full=yes
Export: Release 11.2.0.3.0 - Production on Mon Oct 28 09:47:18 2013
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
UDE-12154: operation generated ORACLE error 12154
ORA-12154: TNS:could not resolve the connect identifier specified
1.根据提示尝试的解决办法：
sqlplus / as sysdba 连接数据库，GRANT CREATE USER,DROP USER,ALTER USER ,CREATE ANY VIEW ,DROP ANY VIEW,EXP_FULL_DATABASE,IMP_FULL_DATABASE,DBA,CONNECT,RESOURCE,CREATE SESSION TO oracle（用户名字） 这里我选择了新建的oracle用户。
然后检查lisenter.ora及tnsnames.ora文件，，发现都正常，但我还是用netca命令重建了监听，再测试expdp发现还是一样的问题。
2.最终解决办法：
su - oracle 用户下查看监听文件发现如下问题：
[oracle@linuxtest admin]$ cat tnsnames.ora
cat: tnsnames.ora: Permission denied
提示权限不够，之前是在root用户下查看的，所以没留意到这个问题。所以猜测问题出在oracle home目录的权限问题。
实验开始的时候我在升级数据库软件时oracle提示oracle_home目录不能与之前的重复即必须新建目录，后来我选择了在原oracle_home目录下创建11.2.3的子目录，同时11.2.0的子目录依然存在，依照提示chown -R oracle:oinstall /oracle/*给oracle_home目录重新赋予权限，再次到oracle用户下查看监听文件，发现可以读取。
尝试expdp 导出全库，发现导出可以正常运行了。
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