Slow Page Draws

Ok here is the problem when ever I add a SELECT statement to my code it just gets slower and slower. Without the SQL statement it takes less than 1 second to draw the page, with the statement it is taking over 3 seconds. For every Sql statement I add to the page it takes about 2-3 seconds longer to draw so 3 Select statements would take almost 10 seconds to draw tha page. All of this is running locally on a Win2003 Web Ed. Server running Tomcat 5.0.24 and MySQL version 4.x. Here is the code
<%@ taglib uri='http://java.sun.com/jsp/jstl/core' prefix='c' %>
<%@ taglib uri='http://java.sun.com/jsp/jstl/sql' prefix='sql' %>
<%@ taglib uri="/WEB-INF/rssutils.tld" prefix="rss" %>
<sql:setDataSource var="dataSrc2" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/hrp?autoReconnect=true" user="root" password="password" />
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>


<html>
<body>
<table border="0" cellspacing="0" cellpadding="2" bordercolor="black" width = "750" height="300">
     <TR>
          <TD valign="top" width="50%">
               <table border="0" cellspacing="0" cellpadding="2" bordercolor="red" width="100%">
                    <TR>
                         <TD valign="top" width="100%"><B>Industry News & Information</B><BR><BR>
                              <rss:feed url="http://www.microsite.reuters.com/rss/businessNews"feedId="example3"/>
                         <table>
                           <tr>
                             <td width="79%" valign="top">
                                   <ul>
                                        <rss:channelImage feedId="example3" height="16" width="72"/>  <font face="Arial, Helvetica, sans-serif" color="#808080" size="1"><rss:channelTitle feedId="example3"/></font><br>
                                        <rss:forEachItem feedId="example3" startIndex="0" endIndex="5">
                                             <li><a href='<rss:itemLink feedId="example3"/>' class='navlink' target="_cnn"><rss:itemTitle feedId="example3"/></a></li>
                                        </rss:forEachItem>
                                   </ul>
                              </td>
                           </tr>
                         </table><BR><BR>
                    </TR>
                    <TR>
                         <TD valign="top" width="100%"><B>Industry Quick Links</B>
                    <c:set var="catid" value="${param.catid}" scope="page" />
                    <c:if test="${empty catid}">
                         <c:set var="catid" value="0" scope="page" />
                    </c:if>
                    <sql:query var="CatalogName" dataSource="${dataSrc2}">
                       select * from linkexcatalog where parentid= ${catid} order by catalogname
                    </sql:query>
                    <ul>
                    <c:forEach var='row' items='${CatalogName.rows}'>
                         <li><a href = 'er_link.jsp?catid=<c:out value='${row.catalogid}'/>' class="navlink"><c:out value='${row.catalogname}'/></a></li>
                    </c:forEach>
                              </ul>
                         </TD>
                    </TR>
               </TABLE>
          </TD>
     </TR>
</TABLE>Any help or pointers would be greatly appreciated.

Ok here is the problem when ever I add a SELECT statement to my code it just
gets slower and slower. Well what would you expect?
You are adding
1 - database processing time
2 - jsp code accessing the data
3 - page rendering.
My guess is that the time will mainly be spent on the database processing. Looking at your page, you don't seem to be doing much more than spitting the data straight back out.
Couple of things to speed things up
1) Use database connection pooling.
Currently every time you run the page it creates a new connection to the database. This is quite a bit of overhead in the scheme of things.
The easiest way is to set up a JNDI datasource in Tomcat:
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/jndi-datasource-examples-howto.html
However instead of modifying server.xml like that page says, I prefer adding the resource tags into a context.xml file as specified here:
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/config/context.html
The settings remain exactly the same, just they are in a different file.
You then change your setDataSource tag to use this JNDI name
eg
if you created a resource under the name: hrpData
<sql:setDataSource var="dataSrc2" dataSource="hrpData"/>2) Tune your queries.
select * from linkexcatalog where parentid= ${catid} order by catalogname
consider indexing the table linkexcatalog to speed up the query. An index on parentid field would let the query run faster.
3)
I am also a fan of using prepared statements and the <sql:param> tag rather than putting the ${catId} parameter directly into the query. That also might make it more efficient.
Hope this helps some,
evnafets

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