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<a name="navskip"></a><td height="25" colspan="4"><img alt="5.数据库和表空间恢复" src="imagemaster/titlebar5.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>数据库恢复</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 1 页（共4 页）</nobr></font></td>
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<p>在本章中，我们将讨论 <code>RESTORE</code> 实用程序，该实用程序将备份文件用作输入，
而将新的或现有数据库作为输出。请注意，尽管我们讨论的是数据库<i>恢复（recovery）</i>，但我们将使用的实用程序名为
<code>RESTORE</code>，而不是 <code>RECOVER</code>。</p>
<p>要恢复到现有数据库，需要 SYSADM、SYSCTRL 或 SYSMAINT 权限。要恢复到新数据库，需要 SYSADM 或 SYSCTRL 权限。
</p>
<p>下面是 <code>RESTORE</code> 命令的语法：
</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
RESTORE DATABASE source-database-alias { restore-options | CONTINUE | ABORT }

restore-options:
  [USER username [USING password]] [{TABLESPACE [ONLINE] |
  TABLESPACE (tblspace-name [ {,tblspace-name} ... ]) [ONLINE] |
  HISTORY FILE [ONLINE]}] [INCREMENTAL [AUTOMATIC | ABORT]]
  [{USE {TSM | XBSA} [OPEN num-sess SESSIONS] |
  FROM dir/dev [ {,dir/dev} ... ] | LOAD shared-lib
  [OPEN num-sess SESSIONS]}] [TAKEN AT date-time] [TO target-directory]
  [INTO target-database-alias] [NEWLOGPATH directory]
  [WITH num-buff BUFFERS] [BUFFER buffer-size]
  [DLREPORT file-name] [REPLACE EXISTING] [REDIRECT] [PARALLELISM n]
  [WITHOUT ROLLING FORWARD] [WITHOUT DATALINK] [WITHOUT PROMPTING]
</code>
</pre>
<p>
让我们研究一个示例。要执行 sample 数据库的恢复，请使用以下命令：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
(1)RESTORE DATABASE sample
(2)  FROM  C:\DBBACKUP
(3)  TAKEN AT 20030314131259
(4)  WITHOUT ROLLING FORWARD
(5)  WITHOUT PROMPTING
</code>
</pre>
<p>
						让我们更仔细地研究该命令：
					</p>
<ol>
						
<li>指明要恢复的数据库映像的名称。</li>
						
<li>指定要从什么位置读取输入备份文件。</li>
						
<li>如果目录中有多个备份映像，那么该选项将根据时间戳记（它是备份名称的一部分）确定特定的备份。</li>
						
<li>如果为数据库启用了归档日志记录，那么当恢复该数据库时，它将自动被置于前滚暂挂状态。
这行告诉 DB2 不要使数据库处于前滚暂挂状态。</li>
						
<li>在执行 <code>RESTORE</code> 时，不会提示您。</li>
					
</ol>
<p>
请注意，语法中没有关键字 <code>OFFLINE</code>，因为这是缺省方式。事实上，对于 <code>RESTORE</code> 实用程序，这是数据库允许的唯一方式。
					</p>
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