oracle的启动与关闭原理-oracle的启动阶段
案例1：如何知道当前数据库是处于哪个阶段SQL> select instance_name,status from v$instance;
INSTANCE_NAME STATUS
-------------------------------- ------------------------
ORCL STARTED --nomount阶段
SQL> select instance_name,status from v$instance;
INSTANCE_NAME STATUS
---------------- ------------
ORCL MOUNTED --mount阶段
SQL> select instance_name,status from v$instance;
INSTANCE_NAME STATUS
---------------- ------------
ORCL OPEN --open阶段
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