plsql登录数据库出错,ora-01034:oracle not available ora-27101: shared memory realm does not exis
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ora-01034 的原因有很多种,通常是数据库服务没启动,或者没有正常启动造成的。
ora-27101是因为前面错误引起的,只要把前面错误解决了。这个错误可能就不存在了。
建议先检验环境,再分析原因:
1、数据库监听是否正常启动。如果启动错误,转到命令行模式下手工启动,这样可以看到准确的错误编码及提示。
2、数据库是否正常启动。如果启动错误,转到命令行模式下手工启动,这样可以看到准确的错误编码及提示。
3、数据以前是否可以正常登录?最近是否有修改机器名、IP地址设置?
4、磁盘空间是否足够、操作系统中数据库用户的权限是否修改过?
总之,保证监听和数据库的正常启动,上面的问题应该可以解决。ora-01034 是一个很大的错误号,手工启动时会有更准确的其它错误号,根据错误号基本都能在网上找到详细的解决方案。
ORA-12560:原因有三:
1.监听服务没有起起来。进windows服务,启动oraclehome92TNSlistener服务。
2.database instance没有起起来。进服务,启动oracleserviceXXXX
3.注册表问题。regedit,然后进入HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOME0将该环境变量ORACLE_SID设置为XXXX,或者进入sqlplus前,在cmd下输set oracle_sid=XXXX,XXXX就是你数据库的SID
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