RE: Pass thru queries WAS: Maximum OBDC Query Size -- MIDRANGE-L

Thank you.

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Mark Waterbury
Sent: Tuesday, April 9, 2019 10:09 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Pass thru queries WAS: Maximum OBDC Query Size

Rob,

I think a "pass thru query" only applies when you are going through some interface like ODBC or JDBC, where perhaps it might somehow try to run the query "locally" ... e.g. on your PC. IIRC, Microsoft products like Access, Excel, etc., all use the "JET Engine" ... the JET engine normally copies all the data and runs the query locally. That's when you want to use a "pass thru" query.

By "Run SQL Scripts" do you mean in Access Client Solutions? Since ACS is an IBM i client, it is designed to send the query over and run it directly on IBM i ... So, no need to worry about any "pass thru query" vs. "local execution" AFAIK ...

Similarly, if you run STRSQL on IBM i in a 5250 session, or you run RUNSQLSTM on IBM i, it runs the query via the built-in Db2i SQL engine directly.

HTH,
Mark S. Waterbury

On Tuesday, April 9, 2019, 9:54:01 AM EDT, Rob Berendt <rob@xxxxxxxxx> wrote:

Does Run SQL Scripts automatically do pass thru queries?
We ran a query against our biggest table selecting a very small subset of rows and bytes across the line were more indicative that it did run a pass thru query.

create table rob.sample1 as(
SELECT *
FROM QSYS2.NETSTAT_INFO
) with data;

select *
from erplxf.glh
where lhdram = 273.41
;
create table rob.sample2 as(
SELECT *
FROM QSYS2.NETSTAT_INFO
) with data;

select * from rob.sample2
where remote_address = '10.10.9.30'
;

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Rob Berendt
Sent: Tuesday, April 9, 2019 7:20 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Maximum OBDC Query Size

Thank you for explaining that.

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Charles Wilt
Sent: Monday, April 8, 2019 5:11 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Maximum OBDC Query Size

"openquery" is the MS SQl Server function used to make pass-through queries.

In Access, it's done a different way..

In both cases, it's the client application deciding to read entire tables, not ODBC itself.

Charles

On Mon, Apr 8, 2019 at 12:45 PM Stefan Tageson <Stefan.Tageson@xxxxxxxx>
wrote:

Then I am thinking of something else.

Eventually you may remember an email sent on August 10, 2017 by a
gentleman Rob Berendt stating:
This is a common problem. This is why, when using ODBC connections,
using "openquery" to do a bulk of the sorting and selection up on the
server instead of doing the raw selection and ordering on the client
can make a phenomenal difference.

Best regards

stefan.tageson@xxxxxxxx
M +46 732 369934

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