How do I limit the number of rows retrieved at a time using RefCursor?

I have a PL/SQL package in use, that returns a REF CURSOR. This is currently being used in a Forms 6i application. Now I want to develop an ASP.NET web application that displays exactly the same information as my Forms 6i module. In fact those two applications will be used concurrently for a while.
I looked at the sample code provided on otn.oracle.com and decided to use the OracleDataAdapter.Fill()-method to fill a dataset and bind that dataset to a pageable GridView. Now I wonder, whether this method retrieves ALL records of the query at once and how I can limit the number of rows fetched? The Select statement retrieves up to 10000 rows at a time. Most of the time, a user is only interested in the first 20-30 rows. Forms 6i fetches more rows as the user scrolls down, how can I implement the same behavior in ODP.NET?
- Markus

Excuse me, but the reply does not quite answer my question. Maybe I did not explain my concerns clear enough:
I understand the use of the two properties (RowSize and FetchSize) to reduce the amount of round trips needed to transfer the data - not the number of rows fetched in total. This would still lead to a situation where all rows are transferred, when I am using the OracleDataAdapter.Fill()-Method. Is this correct or did I misunderstand the function of this method?
I quote the otherwise really helpful article you send me:
Of course, there is a cost if the fetch size is arbitrarily large. More client-side memory and processor cycles will be needed to store and manage a larger amount of data. The goal is to find a high-performing balance between the number of round trips and the amount of data retrieved per trip.
My RowSize is for sure a bit larger than the one in the given example. The query will probably be used by up to 100 users at a time, so I would like to limit the resource-costs not only on the network by the number of round trips, but also on the web-server which is storing all these records in it's memory per user-request.

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null

Debbie (guest) wrote:
: Chad Nale (guest) wrote:
: : How can I limit the number of rows returned by a select
: : statement. I have a query where I return the number of
: stores
: : that are located in a given area.. I only want to return the
: : first twenty-five stores. In some instances there may be
: over
: : 200 stores in a given location.
: : I know is SQL 7 that I can set the pagesize to be 25....
: : Anything similiar in Oracle 8i?
: If you are in Sql*Plus, you could add the statement
: WHERE rownum <= 25
: Used together with an appropriate ORDER BY you
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order the 25 selected
null

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sunny@oimnewbie wrote:
Hi All,
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If this answers your question please mark it accordingly. If this post is helpful, please vote as helpful by clicking the upward arrow mark next to my reply.

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Yvan KOENIG (VALLAURIS, France) dimanche 4 septembre 2011 21:27:41
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.0
My iDisk is : <http://public.me.com/koenigyvan>
Please : Search for questions similar to your own before submitting them to the community

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How do I limit the number of rows retrieved at a time using RefCursor?

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