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
oracle数据库怎么查询表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

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