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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>DB2 控制器规则</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 页（共5 页）</nobr></font></td>
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<p>
						
<b>所需的规则</b>
					
</p>
<p>您必须指定一个关于应何时唤醒守护程序以监控数据库的规则。该规则包含有关要监控哪个数据库、CUP 利用率（在 Windows 中不可用）以及监控之间的休眠时间间隔等信息。</p>
<p>
下面是一个样本规则：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
interval 30; dbname drew_db; account 45;
</code>
</pre>
<p>该规则每隔 30 秒就激活守护程序。如果未提供时间间隔值，则使用缺省值 120 秒。在本示例中，数据库是 drew_db 数据库，每隔 45 秒就将检查 CPU 信息。</p>
<p>规则的子句必须遵循如下所示的特定顺序进行输入：</p>
<ul>
<li>
							
<code>desc</code>（可选）：有关规则的注释，用引号括起。</li>
<li>
							
<code>time</code>（可选）：一天中对规则进行评估的时间。</li>
<li>
							
<code>authid</code>（可选）：一个或多个权限标识，应用程序在该标识下执行语句。</li>
<li>
							
<code>applname</code>（可选）：连接到数据库的可执行文件或对象文件的名称。该名称是区分大小写的。</li>
<li>
							
<code>setlimit</code>：控制器检查的极限值。它们可以是 CPU 时间、返回的行数以及空闲时间等几项值中的某个值。</li>
<li>
							
<code>action</code>（可选）：达到极限值时采取的操作。如果未指定操作，那么当达到极限值时，控制器会把为应用程序工作的代理程序的优先级减低 10 个级别。针对应用程序的操作包括，降低其代理程序的优先级、强制其断开与数据库的连接，或者设置其操作的调度选项。</li>
</ul>
<p>
下面是更多的示例规则：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
desc "Restrict the Unit of Work to be less then 30 minutes"
setlimit uowtime 1800 action force;

desc 'Slow the use of the java tools down for the training user'
authid training
applname javaw.exe
setlimit cpu 5 locks 100 rowssel 1000;


desc "Increase the priority of an important application so it always completes quickly"
applname importantApp .exe
setlimit 
cpu 1 
locks 1 
rowssel 1 
action priority -20;

desc "During day hours do not let anyone run for more than 10 seconds"
time 8:30 17:00 
setlimit cpu 10 
action force;
</code>
</pre>
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