Re: How to improve JDBC performance?

[chrisd@xxxxxxxxxxxxx]

>Hi all
>Are there some tips to improve JDBC jt400 performance connecting
>to an as400 database!

Whoa!  Deja, vu! :)

Without knowing much about your application, it is difficult to give you a
"silver bullet" to solve any JDBC performance issues you may have.

One of the easiest way to improve database performance with JDBC is to make
sure that your queries are as efficient as they can be.  For this, you
might want to use Operations Navigator's "Run SQL" function and then
explain your queries.  This will tell you if you need to build indices for
any of your queries, or identify which queries might need to be
re-implemented.

Another suggestion might have to do with the way you are getting
connections.  Creating JDBC connections takes a lot of time.  If you can,
use a single connection that is created once, or use a connection pool to
create connections.

Also, if you are executing a single statement many times that only has
different parameters each time, you might want to consider using a
PreparedStatement instead of a Statement object.  PreparedStatement allows
you to just plug in the different parameters for each execution, which
saves processing time.

Depending on system loads, you may need to do some tuning to the iSeries
server itself to make the performance of JDBC better.

If you can give some more information, the list might be able to help you
better.

>Thanks in Advance
You are quite welcome.

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Chris DeLashmutt
Senior R&D Analyst
LeasePlan USA
1165 Sanctuary Pkwy., Alpharetta, GA  30004
Phone: 678-202-8695
Fax: 678-566-8551
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