(Charles, I hope you did not measure the time for the first request only - which indeed includes compilation time, but for subsequent calls too).
So to me opening the connection is the major problem. Because the code itself contains html-output, I think using jsp is quite ok.
The code would be much cleaner, if Charles used the JSTL tag-library:
<%@ page language="java"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"; %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql"; %>
<sql:query sql="SELECT * FROM accounts" var="accounts" dataSource=”jndi/myDataSource”/>
<table>
<c:forEach var="acc" items="${accounts}">
<tr>
<td><c:out value="${acc.ID}"/></td>
<td><c:out value="${acc.Name}"/></td>
</tr>
</c:forEach>
</table>
Best regards, Tex
David Smith wrote:
Ok. You're doing this in a jsp. That means Tomcat is:
1) Compiling your jsp to a servlet class.
2) Building a connection from scratch as opposed to picking up a pooled connection
3) Running the query.
Of these, the first one is the most expensive operation followed by two. If you want fast, try
doing this with a pooled connection and from compiled servlet code.
--David
Charles P. Killmer wrote:
Network results Ping statistics for *.*.*.*: Packets: Sent = 140, Received = 140, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms Query Analyzer returns 85 rows in 0 seconds. I modified it to only return Name and ID and it still runs slow. So it cant be row size, network latency, hardware should be ruled out by the fact that it runs super fast through query analyzer, and PHP and ASP.NET. Its only when I write the code in JSP for Tomcat that it slows down.
Charles
-----Original Message-----
From: Allistair Crossley [mailto:[EMAIL PROTECTED] Sent: Monday, February 07, 2005 11:37 AM
To: Tomcat Users List
Subject: RE: JTDS help
Hi,
There's no real reason relating to Tomcat or jTDS that this would run slow. You are more likely to find answers with your hardware, network latency, database load or row size and other environmental factors.
Allistair.
-----Original Message----- From: Charles P. Killmer [mailto:[EMAIL PROTECTED] Sent: 07 February 2005 17:34 To: Tomcat Users List Subject: JTDS help
I am trying to get Tomcat talking to my database quickly. This code takes about 2-3 seconds to load. Anyone got any idea's why? Or if you run this in your environment, how well does it run?
<%@ page language="java" import="java.sql.*"%> <% Connection conn = DriverManager.getConnection("jdbc:jtds:sqlserver://*.*.*.*:143 3/dbname;u ser=******;password=*******");
Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); ResultSet rs;
rs = stmt.executeQuery("SELECT * FROM accounts");
out.println("<table>"); String name; String ID; while (rs.next()) { name = rs.getString("Name"); ID = rs.getString("ID"); out.println("<tr><td>" + ID + "</td><td>"+name+"</td></tr>" ); }
out.println( "</table>" );
conn.close(); %>
This is just a JSP script, nothing is compiled. I know it is better to compile, but I am trying to chase down this DB slowness first.
Charles Killmer Netgain Technology [EMAIL PROTECTED] Office: (320) 251-4700 ext 107
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