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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>设置配置参数</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 6 页（共7 页）</nobr></font></td>
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<p>可以更改<i>实例</i>和<i>数据库</i>级别的配置参数来调优 DB2 的行为。请参考 <a href="../../db2cert7014/tutorial/index.html">监控 DB2 活动</a> 教程以获得有关这些参数的更多信息。可使用 DB2 控制中心和 DB2 命令来查看实例（也称为<i>数据库管理器</i>）和数据库配置参数。</p>
<p>在控制中心中，在要使用的实例或数据库上单击鼠标右键，然后选择 <b>Configure Parameters</b>。您将得到配置参数的列表，其中有对这些参数的描述以及当前值与暂挂值。</p>
<img src="images/db2cc_cfg2.gif" alt="用 DB2 控制中心管理配置参数"><p>也可以通过使用以下 DB2 命令得到相同的输出：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
db2 get database manager configuration
db2 get database configuration for <i>database_name</i>
					</code>
</pre>
<p>要在控制中心中更新数据库管理器或数据库配置参数的值，请打开 DBM 或 DB Configuration 窗口。找到要更改的参数并双击它的值。点击&ldquo;...&rdquo;图标将打开一个表单，其中包含关于如何设置变量的提示和允许取值范围的说明。</p>
<img src="images/db2cc_cfg_set.gif" alt="用 DB2 控制中心设置配置参数"><p>单击 <b>OK</b> 之后，就回到 Configuration 窗口。Pending Value Effective 列告诉您新值将于何时生效。如果该字段显示为&ldquo;After Instance Restart&rdquo;，则在实例重新启动以前，暂挂值将不会被设置为您选中的值。除此情况之外，新值将立即生效。</p>
<p>以下命令可分别用来设置数据库管理器或数据库配置参数的值：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
db2 update database manager configuration using <i>parameter new_value</i>
db2 update database configuration for <i>database_name</i> using <i>parameter new_value</i>
					</code>
</pre>
<p>如果参数不能立即生效，则出现一条警告消息：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">SQL1362W One or more of the parameters submitted for immediate modification
were not changed dynamically. Client changes will not be effective until the next time
the application is started or the TERMINATE command has been issued.  Server changes 
will not be effective until the next DB2START command.</code>
</pre>
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