Trying a few test should help you narrow things down a bit.
1. Run without DB connection. (Done runs fast)
2. Run with a DB connect but no query.
3. Run with a simple query and do nothing with it.
4. Run with a simple query and post results in page. Only move forward through result set.
5. Run with a simple query and post results in page. Move around in the result set (Only if you do this in your page).
At some point in these test you should see a dramatic jump in the response time. If it is a steady climb, then you may have multiple issues.
Report back what you find and we'll make suggestions from there.
Doug
----- Original Message ----- From: "Charles P. Killmer" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Tuesday, January 04, 2005 11:23 AM
Subject: RE: Speed issues with SQL Server 2000 and JTDS
Could this speed issue be caused by a poor setup? When I remove the database connection from my code, the pages run fast. Though I obviously need the database portion of the code in there.
Thanks Charles
-----Original Message----- From: David Boyer [mailto:[EMAIL PROTECTED] Sent: Monday, January 03, 2005 9:05 AM To: tomcat-user@jakarta.apache.org; Charles P. Killmer Subject: RE: Speed issues with SQL Server 2000 and JTDS
You could try using something like jProfiler to see where the bottleneck is.
I don't see anything unusual in your code example, although it looks like the only thing it does is create the connection. I use jTDS and it works fine without doing anything exceptional.
[EMAIL PROTECTED] 01/03 8:55 am >>>
This is some representative code that is being very slow.
import java.sql.*;
public class SomeClass {
public Connection conn;
public int ID;
public String Name;
public String Address;
public String City;
public String OtherStuff;
public SomeClass() throws Exception {
try {Class.forName(net.sourceforge.jtds.jdbc.Driver);
} catch (ClassNotFoundException ex) {}
try {conn =
DriverManager.getConnection(jdbc:jtds:sqlserver://111.222.333.444:1433/
someDB;user=someuser;password=somepassword);
} catch (Exception e) {throw e;
}
}
public int Audit() throws Exception {
return 5;
}
public ResultSet GetData() throws Exception {
ResultSet rs = null;
return rs;
}
public int DeleteSomething() throws Exception {
return 2;
}
}
I don't have anything special in any XML files. I will try to make my
code work like yours is. But if someone has an idea why the way I have
it written is slow, I would love to hear it.
Thank You
Charles
-----Original Message-----
From: Randall Svancara [mailto:[EMAIL PROTECTED]
Sent: Monday, January 03, 2005 8:20 AM
To: Tomcat Users List
Subject: RE: Speed issues with SQL Server 2000 and JTDS
I have been using JTDS with SQL Server 2000 in conjunction with Tomcat
without any problems. Perhaps if you post some your database connection
code, someone could provide you with assistance. You might also try
posting to the JTDS Mailing list. Are you using Database Connection
Pooling (DBCP)??
I am including an example the code I use to access a stored procedure on
SQL Server 2000 using DBCP.
/* Here are the things I import */
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.*;
import javax.sql.*;
Public class SomeClass{* A public class that returns an Applicant object
* @return the applicant as applicant
*/
public Applicant SomeApplicantMethod(){Applicant app = new Applicant();
Connection conn = null;
Statement stmt = null;
ResultSet rst = null;
try{Context ctx = new InitialContext(); /* Declare initial
context */
if(ctx == null ){logger.error(Error creating new context for some
reason);
throw new Exception(No context);
}
/* Throw an exception if it is null */
DataSource ds =
(DataSource)ctx.lookup(java:comp/env/jdbc/summitexec);
conn = ds.getConnection();
if(conn != null) {stmt = conn.createStatement();
rst = stmt.executeQuery(sp_SelectApplicant +
canidateid);
while(rst.next()){
// Add result set to applicant object,
NOT SHOWN HERE!!!
}
//Make sure you close everything, else you end up
with object leaks....
if(stmt != null){stmt.close();
}
if(rst != null){rst.close();
}
if(conn != null){conn.close();
}
}
}catch(Exception E){logger.error(EXCEPTION ERROR Getting Applicant: +
E.toString());
} finally{// Close out of any open connections if they exist, this is
important
// in order to release resources for connection pooling
try{ if(stmt != null){stmt.close();
stmt=null;
}
}catch(SQLException E){} try{ if(rst != null) {rst.close();
rst = null;
}
}catch(SQLException E){} try{ if(conn != null) {conn.close();
conn = null;
}
}catch(SQLException E){}}
}
}
This is the quirky part about Tomcat, in version 5.0 or ealier, I have
to use this xml code in my webapp context file for DBCP.
<Resource name=jdbc/summitexec auth=Container
type=javax.sql.DataSource />
<ResourceParams name=jdbc/summitexec>
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:jtds:sqlserver://192.168.0.2:1433/summitexec;User=someuser;P
assword=somepassword</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>net.sourceforge.jtds.jdbc.Driver</value>
</parameter>
<parameter>
<name>user</name>
<value>someuser</value>
</parameter>
<parameter>
<name>password</name>
<value>somepassword</value>
</parameter>
</ResourceParams>
In 5.5 I have to use this xml for DBCP. If someone could provide
details why this is, I would appreciate it.
<Resource name=jdbc/summitexec
auth=Container
type=javax.sql.DataSource
driverClassName=net.sourceforge.jtds.jdbc.Driver
url=jdbc:jtds:sqlserver://192.168.0.3:1433/summitexec
username=someuser
password=somepassword
maxActive=20
maxIdle=10
maxWait=10/>
Thanks,
Randall
-----Original Message-----
From: Charles P. Killmer [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 02, 2005 2:13 PM
To: Tomcat Users List
Subject: Speed issues with SQL Server 2000 and JTDS
I bought the Core Servlets and Java Server Pages and read it over the
weekend. Happy New Year to me. I did get out to a few parties though.
;) I am having trouble getting JTDS to return results quickly.
Has anyone got any example code for how to properly query a SQL Server
2000 database? The code I write needs to work with both SQL Server 2000
and SQL Server 7. In creating the connection, I am specifying
TYPE_SCROLL_INSENSITIVE and TYPE_CONCUR_READ_ONLY. I tried not
specifying anything and got errors about not being able to scroll the
results. Is the only solution to this, use FORWARD_ONLY and buffer the
contents myself? I hoping there is a better way.
Thank you
Charles Killmer
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