Re: Slow JDBC connection from remote server -- MIDRANGE-L

Do a traceroute from the new Windows box.

Also ping to check ping responses.

Did you do any queries with DBeaver or ACS Run SQL for that matter ?

Perhaps do an FTP transfer as well. Something to rule out other forms of communication.

Did you check the network speed ?

Is new server a VM or Hardware ?

Watch windows task manager when running queries as well.

Regards,
Richard Schoen
Web: http://www.richardschoen.net
Email: richard@xxxxxxxxxxxxxxxxx

----------------------------------------------------------------------

message: 1
date: Thu, 22 Jun 2023 22:40:32 -0400
from: Mark Murphy <jmarkmurphy@xxxxxxxxx>
subject: Re: Slow JDBC connection from remote server

No, there are no differences on the IBM i side. I am changing the Windows server. Both the old and new Windows servers are currently active and both Windows servers are connecting to the same IBM i, but the old server is fast, and the new server is slow.

On Thu, Jun 22, 2023 at 5:32?PM Diego E. KESSELMAN <diegokesselman@xxxxxxxxx>
wrote:

Hi Mark,

I should point to the DNS values (see below), but let me send you a
short checklist:

Have you changed anything on the connection string?
Have you checked the TCP buffers? (CHGTCPA) Suggestion: +1MB (1048576
on both receive and send buffer) Do you have different DNS value?
- Suggestion: Local DNS IP address or *NONE, *LOCAL, FQDN and
hostname entry on your host table.
Are you upgrading from a release previous to V7R2? Sometimes SQE makes
strange things and we need to change the QAQQINI to keep the old behavior.
Have you installed Db2 Symmetric Multiprocessing? Have you activated
this feature?
Have you changed your memory pools ?

Good luck!

--
Regards
Diego E. KESSELMAN

En 22/06/23 15:05, Mark Murphy escribi?:

As far as I can tell, the new server is noticeably faster than the
old server, except for the JDBC connection. I expect this because
the new server is a 4 socket 2.9Ghz Xeon with 64Gb of RAM while the
old server

is a

1 socket 2.0Ghz Xeon with 32Gb RAM. What I don't expect is the
slowness

of

the writes to IBM i

The new server is using a hotspot JVM vs the OpenJ9 JVM on the old

server.

That shouldnt make that much difference should it? The JDBC driver
is the same on both. jtOpen 9.8.

On Thu, Jun 22, 2023 at 4:54?PM Richard Schoen <

richard@xxxxxxxxxxxxxxxxx>

wrote:

Make sure the new server is running at gigabit speed.

Virus scanning/ransomware detection ?

32/64 bit Windows JVM ?

Install something like DBeaver and run some queries.

Just a few thoughts.

Regards,
Richard Schoen
Web: http://www.richardschoen.net
Email: richard@xxxxxxxxxxxxxxxxx

------------------------------

message: 3
date: Thu, 22 Jun 2023 15:25:21 -0400
from: Mark Murphy <jmarkmurphy@xxxxxxxxx>
subject: Slow JDBC connection from remote server

IBM i v7.2

I am experiencing some strange JDBC issues that frankly have me

baffled. I

am using Talend Open Studio to do some ETL with IBM i as the load

target.

It all runs with acceptable speed. I am getting a rate of over 1000
rows per second, but the server we are using to run the jobs is a
bit

limited,

and development speed is a little slow.

So we just got a new server to do the Talend development and
execution

on.

It is a beastly server with plenty of cores, threads, RAM and disk

space.

In fact it is much faster than the previous server. Except that now
I am only getting an insert rate of 10-20 rows per second on IBM i.
Same

driver,

same IBM i, same user profile. All three servers are on the same
network segment in the datacenter. The new Talend server is Running
Windows 2022 Datacenter, the old Talend server is running Windows
Server 2016 Datacenter. I am using the same JDBC driver on both
servers, and running the same JVM on both servers. The connection
is using the same set of

JDBC

jobs on IBM i. Why would one connection be 2 orders of magnitude
slower than the other?

Does anyone have any ideas how to troubleshoot this? Or know of any

tools

that I can use to determine what the issue might be? Or any

configurations

that I might look at? I have already checked the driver options,
and

they

are identical.

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