解决连接Oracle 11g报ORA-01034和ORA-27101的错误
我本机安装的数据库版本是Oracle 11G R2，用plsql连接时候，报ora-12514如下错误：
但是在cmd里用sqlplus连接已经创建的用户时候，报如下错误：
ORA-01034 - Oracle not available
ORA-27101 - shared memory realm does not exist
网上查了几个解决资料，说是oracle home和sid的问题，或者是让使用Net Configuration Assistant重建本地网络服务名。实践了一下，，都不管用。
经过总结，使用如下方法解决比较好：
1、首先看一下 ORACLE_BASE\ORACLE_HOME\DATABASE 下面的 ORADIM.LOG 文件
E:\app\psun\product\11.2.0\dbhome_1\database：
看日志才发现原来报的下面的错误！！
ORA-00119: invalid specification for system parameter LOCAL_LISTENER
ORA-00132: syntax error or unresolved network name 'LISTENER_ORCL'
2、进过查找该错误，发现是tnsnames.ora文件中少了如下语句的原因
LISTENER_MAXIMO =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
添加后，重启数据库实例服务，重启监听程序：
再次使用SQLPLUS、plsql连接，好了，呵呵！
更多Oracle相关信息见Oracle 专题页面 ?tid=12
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