B14231 第131页

alter system suspend语句挂起数据文件和控制文件的I/O操作。挂起状态可以避免备份数据库时的IO操作。当数据库试图进入挂起状态时，允许当前活动的事务完成，新发起的事务会进入队列中。

下面演示将数据库挂起以及恢复的过程

[@more@]

登录数据

ora_test@oracle[/home/oracle]> sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Mar 11 09:49:32 2010

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

挂起数据库

sys@CNHTM> alter system suspend;

System altered.

查询数据库状态，显示为挂起

sys@CNHTM> select database_status from v$instance;

DATABASE_STATUS
-----------------
SUSPENDED

这时，在另一窗口中用用scott用户登录，登录处于挂起状态

ora_test@oracle[/home/oracle]> sqlplus scott/tiger

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Mar 11 10:04:35 2010

Copyright (c) 1982, 2005, Oracle. All rights reserved.

恢复数据库的正常状态

sys@CNHTM> alter system resume;

System altered.

这时，另一窗口中登录数据库的操作，已经成功

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

scott@CNHTM>

查询数据库状态，显示为active

sys@CNHTM> select database_status from v$instance;

DATABASE_STATUS
-----------------
ACTIVE

--end--

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oracle数据库的挂起(Suspending)和恢复(Resuming)

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