Re: MS SQL Server JDBC connections

Could be, and if so there's not much I can do.
Seems odd that PC has no trouble though...

-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On
Behalf Of Bill Layman
Sent: 22 February 2006 15:44
To: Websphere Development Studio Client for iSeries
Subject: Re: [WDSCI-L] MS SQL Server JDBC connections

Chris,
    Could it be a firewall issue connecting to the SQL server? Just a 
thought

Price, Chris wrote:

>Thanks for the reply guys, but the problem is occurring after the JVM has
>started - my timings are generated in the main method being executed.
Before
>creating the SQL Server connection, which is what seems to hang, an iSeries
>JDBC connection is already created, which is much quicker. 
>
>I think the problems are either:
>- something to do with the SQL Server JDBC driver, (perhaps a property
needs
>setting somewhere).
>- are network related (but since both the iSeries and development PC's are
>on the Lan and the SQL server is in a DMZ, I would have though that the
>connection speeds would be similar.)
>- resource related - it just happens to be at this point the jvm runs out
of
>memory and starts asking for more? (does anyone have any tuning pointers?)
>
>Once the connection created the actual data transfers take roughly the same
>amount of time.
>
>Regards,
>Chris.
>
>
>-----Original Message-----
>From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On
>Behalf Of Vernon Hamberg
>Sent: 22 February 2006 13:51
>To: Websphere Development Studio Client for iSeries
>Subject: Re: [WDSCI-L] MS SQL Server JDBC connections
>
>Glad to see I'm not crazy - oh, well, might be, but was right on this 
>one, anyway. Seems CRTJVAPGM does not affect JVM startup - makes 
>sense - it is really about shortcutting the JIT kind of thing (I'm 
>probably saying that wrong in some way, but do you get the idea?). 
>The JVM startup is not based on any of the created Java program 
>objects, what it is doing is the security and other authentication, 
>the more classes, the longer. At least, according to my colleague 
>across the aisle.
>
>We found one way to get around this is to use an NEP to do the Java 
>stuff. Definitely do NOT start new jobs for every Java evocation, and 
>the same goes for client/server kinds of things that often fire off a 
>new thread of job.
>
>HTH
>Vern
>
>At 07:36 AM 2/22/2006, you wrote:
>
>  
>
>>I tried some jave, and it happens exactly what vernon said, firs time the
>>job start the JVM, second and other time time was very good
>>----- Original Message -----
>>From: "Vernon Hamberg" <vhamberg@xxxxxxxxxxx>
>>To: "Websphere Development Studio Client for iSeries"
>>    
>>
><wdsci-l@xxxxxxxxxxxx>
>  
>
>>Sent: Wednesday, February 22, 2006 2:26 PM
>>Subject: Re: [WDSCI-L] MS SQL Server JDBC connections
>>
>>
>>    
>>
>>>A maybe - the JVM on the iSeries has not started up, so it has to go
>>>through its initial authentication. This always takes a long time.
>>>Whereas, in Eclipse, your JVM is already running. Consider how long
>>>it takes to start up Eclipse.
>>>
>>>So can you try doing the extract twice in one program (or job on the
>>>iSeries)? The second should be faster if my theory is anywhere close.
>>>
>>>HTH
>>>Vern
>>>
>>>At 04:38 AM 2/22/2006, you wrote:
>>>
>>>      
>>>
>>>>All,
>>>>
>>>>
>>>>
>>>>I have a JDBC based application that is extracting data from an iSeries
>>>>database, and writing it out to an MS SQL Server database. In eclipse
>>>>        
>>>>
>on
>  
>
>>my
>>    
>>
>>>>PC a simple extract takes about 5 secs. However when I move the code
>>>>        
>>>>
>onto
>  
>
>>>>the iSeries, the same extract takes 55 secs, a 10 fold increase.
>>>>        
>>>>
>Changing
>  
>
>>>>the iSeries database driver from jt400 to db2 makes no difference.
>>>>        
>>>>
>>Running
>>    
>>
>>>>crtjvapgm on all the jar's makes no difference.
>>>>
>>>>
>>>>
>>>>Looking at my log output, most of the time is spent creating the SQL
>>>>        
>>>>
>>server
>>    
>>
>>>>connection. Why would this take so long on the iSeries, but be
>>>>        
>>>>
>>practically
>>    
>>
>>>>instantaneous on my PC? (The SQL server database is not local to my PC
>>>>either, it's on the other side of a firewall). I'm using the MS
>>>>        
>>>>
>>sqljdbc.jar
>>    
>>
>>>>I downloaded from the MS website. Are there some tuning options I can
>>>>        
>>>>
>>play
>>    
>>
>>>>with? Is there a better jar to use?
>>>>
>>>>
>>>>
>>>>Anyone else had this problem?
>>>>
>>>>
>>>>
>>>>Regards,
>>>>
>>>>Chris.
>>>>
>>>>
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