oracle数据库的启动和关闭操作

[oracle@mylinux ~]$ sqlplus " / as sysdba"　//通过sqlplus工具用户sysdba

SQL*Plus: Release 11.1.0.6.0 - Production on Fri May 28 01:41:50 2010

Copyright (c) 1982, 2007, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup // 启动数据库实例
ORACLE instance started.

Total System Global Area 422670336 bytes
Fixed Size 1300352 bytes
Variable Size 293603456 bytes
Database Buffers 121634816 bytes
Redo Buffers 6131712 bytes
Database mounted.
Database opened.
SQL> select * from t_staff;

STAFFNO STAFFNAME STAFFTYPE STATUS
---------- ------------------------------ ---------- ----------
0 levin 1 01
1 xieyx 2 01
3 zhaob 2 02

SQL> shutdown immediate　　//关闭数据库
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> quit　// 退出
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@mylinux ~]$