Oracle9i数据库异常关闭后的启动
正在看的ORACLE教程是:Oracle9i数据库异常关闭后的启动。Oracle shutdown的时候突然断电,导致使用sql/plus启动时无法连接到数据库,具体描述为:connection can not permitted, shut in progress.
到dos 提示符 键入:
c:\> sqlplus /nolog
显示:
sql/plus: Realease9.0.2……..all rights reserved
sql> connect /as sysdba
显示已连接至空闲例程
sql>startup 显示shutdown in progress.
到sqlplus 里面连接:
sys/manager@orcl92 显示信息连接成功。
Sql: select * from tab;
显示norows selected;
表明:没有启动数据库。 后来查阅相关资料:得出解决方法:
到dos 提示符 键入:
c:\> sqlplus /nolog
显示 sql/plus: Realease9.0.2……..all rights reserved
sql> connect /as sysdba
显示已连接至空闲例程
sql> startup force
显示:已启动。数据库已正常启动。
也可以先将 windows services中将oraclehome92 service 停止,再启动oracle enterprise manager console,选择独立启动,选择数据库,点击orcl(全局数据库名),弹出对话框,输入用户名system密码password,连接身份:sysdba,选择例程,配置,在一般信息标签下将例程状态先改为关闭,在打开。如果提示oraclehome92 service 停止,则将这个服务启动起来,再启动数据库,也可解决问题。
附:startup force 强制启动一个没有关闭或没能正常启动的数据库;过程:先关闭实例,再启动。
Startup restrict 以限制模式启动数据库,从而限制访问数据库,只有具有 restricted session 权限的用户能与数据库连接
alter system [enable/disable] restricted session 在数据库打开后,该语句启动或关闭访问限制功能。如果相对主结构做更改或想得到导出一致性,应将数据库设置为限制模式。 只有具有alter system权限,才可以用alter system [enable/disable] restricted session 命令改变数据库的可用性。
当一个实例以nomount状态启动时,只能访问sga读取数据的视图。关于 v$thread,v$controlftle等信息从sga 读取数据的词典视图。当数据库被装配时,关于 v$thread,v$controlftle等信息从控制文件中被读出。
分析,当数据库异常关闭时,shutdown在程序里没有退出,因此启动实例时检测到shutdown,则系统报错。因此需要先关闭数据库,再启动数据库。

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