oracle 启动四种状态
启动:
shutdown 关闭
nomount 启动
mount 挂载
open 打开
关闭:
shutdown
shutdown abort;不硬盘落地(不论提交不提交)
shutdown immediate;将提交的写回硬盘,然后关闭数据库
shutdown transaction;等待现有连接都提交后关闭数据库
shutdown normal;等待所有回话连接终断后关闭数据库
启动:
startup;
startup mount;
startup open;
select open_mode from v$database;
select status from v$instance;
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