Re: Bad performance on Linked Server

<snip>
Finally note that it can be used for SELECT queries or INSERT/DELETE.
</snip>
Is that another whack with the 2x2, as I had an example of a delete below?

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 7310 Innovation Blvd, Suite 104
Ft. Wayne, IN 46818
Ship to: 7310 Innovation Blvd, Dock 9C
Ft. Wayne, IN 46818
http://www.dekko.com


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Charles Wilt
Sent: Wednesday, February 24, 2021 9:33 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Bad performance on Linked Server

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Hmm... I recognize those examples... :)

And just to clarify...

"openquery" is SQL Server's implementation of "SQL pass-through"

Finally note that it can be used for SELECT queries or INSERT/DELETE.

Charles



On Wed, Feb 24, 2021 at 7:10 AM Rob Berendt <rob@xxxxxxxxx> wrote:

I think openquery may be the answer. I have a monthly reminder to beat

me

up side the head with a 2x2 to remind me of this:


<snip>
openquery is just MS SQL Server's technique for a "linked server". Some
sql engines always do it. Some do it within setup or connection
configuration.

openquery:
I assume you're trying to set up a linked server?

https://www-01.ibm.com/support/docview.wss?uid=nas8N1014514

Once you get connected, note the following:

-- Pull all rows from the table(s) back to MS SQL server and do the where
locally
select * from LINKEDSVR.MYIBMI.MYLIB.MYTBL where locnbr = '00335';

-- Sends the statement to linked server for processing
select * from openquery(LINKEDSVR, 'select * from MYTBL where locnbr =
''00335''');

--OPENQUERY() isn't just for SELECTS
delete from openquery(LINKEDSVR, 'select * from MYTBL where locnbr =
''00335''');
</snip>


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 7310 Innovation Blvd, Suite 104
Ft. Wayne, IN 46818
Ship to: 7310 Innovation Blvd, Dock 9C
Ft. Wayne, IN 46818
http://www.dekko.com


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Justin Taylor
Sent: Wednesday, February 24, 2021 8:59 AM
To: MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Bad performance on Linked Server

CAUTION: This email originated from outside of the organization. Do not
click links or open attachments unless you recognize the sender and know
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I have a local SQL Server instance running on my PC with a Linked Server
connected to my IBMi. Running a simple query (select column_list_here

from

SCHEMA.TABLE) takes about 9x longer than SQuirreL (using JT400.jar) on my
PC.

Any suggestions on shrinking that performance gap?

TIA
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