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<a name="navskip"></a><td height="25" colspan="4"><img alt="3.捕获事件监视器数据" src="imagemaster/titlebar3.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>打开和关闭监视器</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 6 页（共10 页）</nobr></font></td>
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<p>可以随时打开和关闭事件监视器。事件监视器<code> state </code> 值表明事件监视器是否正在运行。</p>
<p>
下面是打开或关闭监视器的命令：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
db2 set event monitor eventMonitorName state [0|1]
</code>
</pre>
<p>
<code>eventMonitorName</code> 是已创建的事件监视器的名称。0 将关闭监视器，而 1 将打开监视器。</p>
<p>监视器的当前状态可以通过使用 SQL 命令来决定。DB2 目录表也包含有关已创建的事件监视器的信息。</p>
<p>
						
<b>SQL 命令</b>
					
</p>
<p>SQL 函数 <code>EVENT_MON_STATE</code> 根据指定的名称返回事件监视器的状态。下面是该 SQL 命令的示例（所使用的表是个空表，通常起占位符的作用）：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
SELECT EVENT_MON_STATE('drewTest) FROM SYSIBM.SYSDUMMY1
</code>
</pre>
<p>
						
<b>目录表</b>
					
</p>
<p>SYSIBM.SYSEVENTMONITORS 表及该表的视图 SYSCAT.EVENTMONITORS 包含有关已创建的事件监视器的信息。可以对这些表运行 SQL 查询，以确定监视器的状态：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
SELECT evmonname, target_type, target, 
FROM syscat.eventmonitors
where evmonname LIKE 'drew%'
</code>
</pre>
<p>
						
<b>autostart 选项</b>
					
</p>
<p>用于创建事件监视器的命令中的 <code>autostart</code> 选项表明，每当数据库启动时，自动启动事件监视器。</p>
<p>
						
<b>清空事件监视器</b>
					
</p>
<p>还可将事件监视器数据清空到磁盘中。如果您希望记录这类信息，如通常仅当终止所有连接时才写的数据库事件，那么这非常有用。下面是一个示例命令：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
db2 flush event monitor eventMonitorName
</code>
</pre>
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