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ListGrid with progressive loading

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Hi,

Good morning,

I have some queries related to ListGrid for progressive loading. Table contains thousands of records and the data page size is set to 50.

Now ListGrid internally calls to database 3 times for getting 150 records in advance.

My Queries:

1. Does it fetches all the records for each database call?
2. Does it truncate the data at server side and send the paginated data to the client?
3. If I uses the ROWNUM for oracle database queries pagination, will it improve the performance?
4. Should I use progressive loading?

Sample DS.xml

Code:


<DataSource ID="test_view" serverType="sql"
        tableName="test_view" autoDeriveSchema="true">
       
       
        <operationBindings>
                <operationBinding operationId="test_data" operationType="fetch" progressiveLoading="true">
              ...

Here is other detail:

BuildDate Wed Mar 05 15:52:00 IST 2014
Version 4.1p
SCVersionNumber v9.1p_2014-03-05

Thanks

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