Question : MS SQL Server hanging

I have a SQL Server db on which I run a series of queries 5-6 times a day. The queries don't change at all; rather the data the queries act on changes. Yesterday the application started to hang. I have isolated the command causing the problem but cannot figure out why. Here is the command:

update bnlist
set quantity = 0
where bnlist.isbn < '0226143406'
and not exists (select * from tmp_DBase_Editor where bnlist.sku=tmp_DBase_Editor.sku)
GO

basically the object is to create a zero quantity for each record in bnlist if the record does not exist in tmp_DBase_Editor. Any help much appreciated.

Answer : MS SQL Server hanging

Well I found a solution.  I change the javascript used to display the divs to an onload function and I created a php variable to set the initial status of the style display of the div.  Then onchange the javascript forces the div display status to a new setting.  Below is the code.
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 <?php

require_once("cmscommon.inc");


?>
<html>
<head>
<title>CMS Article Entry/Edit</title>
<STYLE TYPE="text/css">
	.headw  { font: BOLD 14pt arial, helvetica, sans-serif; }
	.headw { color: #336600; }
	.headk  { font: BOLD 11pt arial, helvetica, sans-serif; }
	.headk { color: #336600; }
	.smallk { font: 10pt arial, helvetica, sans-serif; }
	.smallgk { font: 10pt arial, helvetica, sans-serif; }
	.smallgk { color: #336600; }
	.tinyk  { font: 8pt arial, helvetica, sans-serif; }


    </style>

  <script type="text/javascript">
    window.onload = function() 
	{
        var eSelect = document.getElementById('appselect');
		
        eSelect.onchange = function() 
		{
            if(eSelect.selectedIndex === 0) 
			{
           document.getElementById('cdiv2').style.display='none';
		   document.getElementById('cdiv3').style.display='none';
		   }
		    else if(eSelect.selectedIndex === 1)
			 {
           document.getElementById('cdiv2').style.display='none';
		   document.getElementById('cdiv3').style.display='none';
            }
			 else if(eSelect.selectedIndex === 2)
			 {
           document.getElementById('cdiv2').style.display='block';
		   document.getElementById('cdiv3').style.display='none';
            }
		   else if(eSelect.selectedIndex === 3)
			 {
           document.getElementById('cdiv2').style.display='none';
		   document.getElementById('cdiv3').style.display='block';
            }
        }
    }
  </script>
 </head>
 
<?php

	  
	  $sql = "SELECT * FROM cmsmain WHERE cmsid = 100606";
	  $result = db_query($sql, $db);        
      $myrow = mysql_fetch_array($result);
	  $coveragearea=$myrow["coveragearea"];
	  $application=$myrow["application"];
	  $topicid = $myrow["topicid"];


		$sql = "SELECT * FROM cmstopic";
		$topicresult = db_query($sql, $db);

  ?> 

<body link="#336600" alink="#669966" vlink="#669966" >
	
<form name="addarticle" method="post" action="2.3EditorUpdateDatabase.php">


<input type="hidden" name="cmsid" value="<?php echo $cmsid?>">


  <table width="100%" cellpadding="0" cellspacing="4" border="0" bgcolor="#FFFFFF">
	<tr>
	<td align="left" width="20%" class="smallgk"><b>Application:</b></td>
	<td width="30%" align="left"><select id="appselect"  name="application" >
          <option  <?php if($application == ""){?> selected <?php } ?>value="">Please Select</option>
          <option <?php if($application == "Need To Know Guides"){?> selected <?php } ?>value="Need to Know Guides">Need To Know Guides</option>
          <option <?php if($application == "Buying Guides"){?> selected <?php } ?>value="Buying Guides">Buying Guides</option>
		  <option <?php if($application == "Local Page Articles"){?> selected <?php } ?>value="Local Page Articles">Local Page Articles</option>
        </select></td>
	
	<?php if($application == 'Buying Guides'){$topicstatus='block';}else{$topicstatus='none'; } ?>
	<?php if($application == 'Local Page Articles'){$castatus='block';}else{$castatus='none'; } ?>	
	
<td width="49%" align="left" class="smallgk"><b>

	<div   id="cdiv2" style="display: <?php echo $topicstatus; ?>;" >

	Topic:&nbsp;&nbsp;&nbsp;&nbsp;
	  <select  name="topic">
	  <option value="" selected>- Select -</option>
	  <?php
	     while ($mytopic = mysql_fetch_array($topicresult))
			{
			?>
			<option value="<?php echo $mytopic["topicid"]; ?>"	<?php if($topicid == $myrow["topicid"]){?>selected<?php } ?>><?php echo $mytopic["topicname"] ?></option>
			<?php
			}
			?>
		</select>
			  </div>
<div   id="cdiv3" style="display: <?php echo $castatus; ?>;" >

	
	    Coverage Area:&nbsp;&nbsp;&nbsp;&nbsp;
                  <select  name="coveragearea">
				  <option value="0" selected>- Select -</option>
				<option	<?php if($coveragearea == "Alaska"){?>selected<?php } ?>>Alaska	</option>
				<option	<?php if($coveragearea == "Arizona"){?>selected<?php } ?>>Arizona</option>
				<option	<?php if($coveragearea == "Arkansas"){?>selected<?php } ?>>Arkansas</option>
				<option	<?php if($coveragearea == "California"){?>selected<?php } ?>>California</option>
				<option	<?php if($coveragearea == "Colorado"){?>selected<?php } ?>>Colorado</option>
				<option	<?php if($coveragearea == "Connecticut"){?>selected<?php } ?>>Connecticut</option>
				<option	<?php if($coveragearea == "Delaware"){?>selected<?php } ?>>Delaware</option>
				<option	<?php if($coveragearea == "Florida"){?>selected<?php } ?>>Florida</option>
				<option	<?php if($coveragearea == "Georgia"){?>selected<?php } ?>>Georgia</option>
				<option	<?php if($coveragearea == "Hawaii"){?>selected<?php } ?>>Hawaii</option>
				<option	<?php if($coveragearea == "Idaho"){?>selected<?php } ?>>Idaho</option>
				<option	<?php if($coveragearea == "Illinois"){?>selected<?php } ?>>Illinois</option>
				<option	<?php if($coveragearea == "Indiana"){?>selected<?php } ?>>Indiana</option>
				<option	<?php if($coveragearea == "Iowa"){?>selected<?php } ?>>Iowa</option>
				<option	<?php if($coveragearea == "Kansas"){?>selected<?php } ?>>	Kansas</option>
				<option	<?php if($coveragearea == "Kentucky"){?>selected<?php } ?>>Kentucky</option>
				<option	<?php if($coveragearea == "Louisiana"){?>selected<?php } ?>>Louisiana</option>
				<option	<?php if($coveragearea == "Maine"){?>selected<?php } ?>>Maine</option>
				<option	<?php if($coveragearea == "Maryland"){?>selected<?php } ?>>Maryland</option>
				<option	<?php if($coveragearea == "Massachusetts"){?>selected<?php } ?>>Massachusetts</option>
				<option	<?php if($coveragearea == "Michigan"){?>selected<?php } ?>>Michigan</option>
				<option	<?php if($coveragearea == "Minnesota"){?>selected<?php } ?>>	Minnesota</option>
				<option	<?php if($coveragearea == "Mississippi"){?>selected<?php } ?>>	Mississippi</option>
				<option	<?php if($coveragearea == "Missouri"){?>selected<?php } ?>>Missouri</option>
				<option	<?php if($coveragearea == "Montana"){?>selected<?php } ?>>Montana</option>
				<option	<?php if($coveragearea == "Nebraska"){?>selected<?php } ?>>Nebraska</option>
				<option	<?php if($coveragearea == "Nevada"){?>selected<?php } ?>>Nevada</option>
				<option	<?php if($coveragearea == "New Hampshire"){?>selected<?php } ?>>New Hampshire</option>
				<option	<?php if($coveragearea == "New Jersey"){?>selected<?php } ?>>New Jersey</option>
				<option	<?php if($coveragearea == "New Mexico"){?>selected<?php } ?>>New Mexico</option>
				<option	<?php if($coveragearea == "New York"){?>selected<?php } ?>>New York</option>
				<option	<?php if($coveragearea == "North Carolina"){?>selected<?php } ?>>North Carolina	</option>
				<option	<?php if($coveragearea == "North Dakota"){?>selected<?php } ?>>North Dakota</option>
				<option	<?php if($coveragearea == "Ohio"){?>selected<?php } ?>>Ohio</option>
				<option	<?php if($coveragearea == "Oklahoma	"){?>selected<?php } ?>>Oklahoma</option>
				<option	<?php if($coveragearea == "Oregon"){?>selected<?php } ?>>	Oregon</option>
				<option	<?php if($coveragearea == "Pennsylvania"){?>selected<?php } ?>>Pennsylvania</option>
				<option	<?php if($coveragearea == "Rhode Island"){?>selected<?php } ?>>Rhode Island</option>
				<option	<?php if($coveragearea == "South Carolina"){?>selected<?php } ?>>South Carolina</option>
				<option	<?php if($coveragearea == "South Dakota"){?>selected<?php } ?>>South Dakota</option>
				<option	<?php if($coveragearea == "Tennessee"){?>selected<?php } ?>>Tennessee</option>
				<option	<?php if($coveragearea == "Texas"){?>selected<?php } ?>>Texas</option>
				<option	<?php if($coveragearea == "Utah"){?>selected<?php } ?>>Utah</option>
				<option	<?php if($coveragearea == "Vermont"){?>selected<?php } ?>>Vermont</option>
				<option	<?php if($coveragearea == "Virginia"){?>selected<?php } ?>>	Virginia</option>
				<option	<?php if($coveragearea == "Washington"){?>selected<?php } ?>>Washington</option>
				<option	<?php if($coveragearea == "West Virginia"){?>selected<?php } ?>>	West	Virginia</option>
				<option	<?php if($coveragearea == "Wisconsin"){?>selected<?php } ?>>Wisconsin</option>
				<option	<?php if($coveragearea == "Wyoming"){?>selected<?php } ?>>Wyoming</option>
				<option	<?php if($coveragearea == "District of Columbia"){?>selected<?php } ?>>District of Columbia</option>


</select></div>

</td>


		</tr>
  </table>
  
</form>
</body>
</html>
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