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Re: NO DATA error message in Frontend when querying large datasets

From: Jens Kapp <jens-kapp(at)gmx(dot)de>
To: Korry Douglas <korry(dot)douglas(at)enterprisedb(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-odbc(at)postgresql(dot)org, pgsql-bugs(at)postgresql(dot)org
Subject: Re: NO DATA error message in Frontend when querying large datasets
Date: 2011-01-27 11:14:47
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugspgsql-odbc
  thanks a lot, "Declare/Fetch" fixed our issue!

Am 27.01.2011 00:36, schrieb Korry Douglas:
>> thanks a lot for your response.
>> the frontend we are trying to use is a well known and spread laboratory system. our consultant has experience with other databases (oracle, sql) that are a lot bigger - with no problems. however i'm wondering that postgres is not working with the lab system AND other common DB frontends using ODBC. i guess there is no setting for: "use cursor instead" ?
> "Use Declare/Fetch" may be the setting that you want.  That's a setting in the ODBC driver and you should be able to change that setting through the Windows ODBC Administrator.
> You may also want to change the "Server side prepare" setting.  (Be sure to change one setting at a time and test your application between changes).
>              		-- Korry
>> Am 26.01.2011 20:16, schrieb Tom Lane:
>>> Jens Kapp<jens-kapp(at)gmx(dot)de>   writes:
>>>> we have postgres 9.0.1 installed on a windows 2008 r2 server.
>>>> odbc is
>>>> the database has currently a size of around 800mb.
>>>> it works as expected on the server (pgadmin), but if we try queries for
>>>> large datasets we get the error message: "No data" from our frontend or
>>>> any other database tools thats using the ODBC connection (e.g. anysql
>>>> maestro).
>>>> 1.) first we will make a query with only 1 column. we get data.
>>>> 2.) then make the same query but with all columns: it says "No data".
>>>> 3.) Afterwards we try the query from before again, but still getting "No
>>>> data".
>>> I wonder whether you're running out of memory for the query result in
>>> the client side, and this "no data" is coming from some code that is not
>>> written to cope with that happening.
>>> You might consider using a cursor to fetch large results a few rows at a
>>> time.
>>> 			regards, tom lane
>> -- 
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> -----------------------------------------------------------------------
> Korry Douglas
> Senior Database Dude
> EnterpriseDB Corporation
> The Enterprise Postgres Company
> Phone: (804)241-4301
> Mobile: (620) EDB-NERD

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