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From "Parsons Technical Services" <parsonstechni...@earthlink.net>
Subject Re: Speed issues with SQL Server 2000 and JTDS
Date Fri, 07 Jan 2005 21:20:31 GMT
Since the addition of the query does not add to the time then using a 
connection pool will return your speed to normal. You may wish to dive into 
the connection issue and determine what is causing it to be so slow to 
connect. IE put a sniffer on the line and see what is going back and forth. 
It could also be in the drivers or a number of other issues.

There may be some parameters on the connection that will give you a faster 
connect time.

At this point I think you are down to two choices:

1. Use pooling to eliminate the connection lag time(that's what it was 
developed for in the first place).

2. Try different drivers and/or parameters to speed up the connect time.

Doug


----- Original Message ----- 
From: "Charles P. Killmer" <charlesk@netgaintechnology.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Friday, January 07, 2005 2:43 PM
Subject: RE: Speed issues with SQL Server 2000 and JTDS


I tried pinging the server and responses are all <1ms.  I have also
tried without a DB Connection, Fast, with a DB Connection and no query,
slow, and with a DB Connection and with a query, just as slow.

Charles

-----Original Message-----
From: Randall Svancara [mailto:rsvancara@adaweb.net]
Sent: Wednesday, January 05, 2005 2:25 PM
To: Tomcat Users List
Subject: RE: Speed issues with SQL Server 2000 and JTDS

Try pinging the server with Microsoft SQL Server from the server running
tomcat.  You might use a traceroute to see where the network bottleneck
may exist.

What are your ping times.  Are you experiencing network latency?  Are
you going through a Firewall?  I am using JTDS and I have not
experienced any problems with it.

Randall



-----Original Message-----
From: Charles P. Killmer [mailto:charlesk@netgaintechnology.com]
Sent: Wednesday, January 05, 2005 11:57 AM
To: Tomcat Users List
Subject: RE: Speed issues with SQL Server 2000 and JTDS

I tried setting that parameter to false and still the same slow issue.
The fields in the database are all char or varchar.  No unicode.

Charles

-----Original Message-----
From: Victor Cardona [mailto:vcardona@covad.net]
Sent: Wednesday, January 05, 2005 11:44 AM
To: Tomcat Users List
Subject: Re: Speed issues with SQL Server 2000 and JTDS

Charles P. Killmer wrote:

>Thanks.  I had already done this but maybe not communicated them as
>concisely.
>
>Thanks
>Charles
>
>-----Original Message-----
>From: Parsons Technical Services
>[mailto:parsonstechnical@earthlink.net]
>
>Sent: Tuesday, January 04, 2005 6:23 PM
>To: Tomcat Users List
>Subject: Re: Speed issues with SQL Server 2000 and JTDS
>
>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. (Done runs slow)
>
>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" <charlesk@netgaintechnology.com>
>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:david@bvu.edu]
>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.
>
>
>
>
>
>>>>charlesk@netgaintechnology.com 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:rsvancara@adaweb.net]
>
>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:charlesk@netgaintechnology.com]
>
>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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>
>.
>
>
>
How are your tables set up? Do they use CHAR/VARCHAR or NCHAR/NVARCHAR?

You might need to change the setting of the
"sendStringParametersAsUnicode" attribute.  See
http://jtds.sourceforge.net/faq.html for more details.

Victor


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