几种不同oracle数据库启动方式的对比，及启动状态的切换、查询

说明：几种不同oracle数据库启动方式的对比，及启动状态的切换、查询

1 状态查询

启动状态

SQL语句

结果

nomount

select status from v$instance;

STARTED

select open_mode from v$database;

ERROR at line 1:

ORA-01507: database not mounted

mount

select status from v$instance;

MOUNTED

select open_mode from v$database;

MOUNTED

open

select status from v$instance;

OPEN

select open_mode from v$database;

READ WRITE 或者 READ ONLY

2 实验过程

SQL> startup nomount;

Oracle instance started.

 

Total System Global Area  125829120 bytes

Fixed Size                  1247684 bytes

Variable Size              92276284 bytes

Database Buffers           25165824 bytes

Redo Buffers                7139328 bytes

 

SQL> select status from v$instance;

 

STATUS

------------

STARTED

 

SQL> select open_mode from v$database;

select open_mode from v$database

*

ERROR at line 1:

ORA-01507: database not mounted

 

SQL> alter database mount;

 

Database altered.

 

SQL> select status from v$instance;

 

STATUS

------------

MOUNTED

 

SQL> select open_mode from v$database;

 

OPEN_MODE

----------

MOUNTED

 

SQL> alter database open;

 

Database altered.

 

SQL> select status from v$instance;

 

STATUS

------------

OPEN

 

SQL> select open_mode from v$database;

 

OPEN_MODE

----------

READ WRITE