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Sorting Question

Posted By:      Posted Date: September 04, 2010    Points: 0   Category :Sql Server
Background:  I am using SSIS / BIDS 2005 with multiple Sybase ASE 15.0 databases as the "source" for my ETL and SQL Server 2005 as the target where the transformed results will go.  I am converting an Access based ETL app I built in the past to SSIS. I have a bunch of tables that need to be joined together to create a large result set.  many of these tables are reference tables.  Creating a giant query that hits Sybase to pull all the data in one go causes Sybase to bog down.  The way I handled this in the past (Access) was I created smaller queries with 2-3 table joins and put the results in staging tables and then in turn joined those tables to get to my end result with another query.  This worked pretty well. In SSIS I have one DFT for this particular query.  In the DFT I have a series of OLE DB datasources some of which contain queries to Sybase that join 2-3 tables at a time.  I also have a series of raw files I created as outputs from other DFTs for later use (in lieu of stating tables).  I am now using sorts and merges to join all this data together in this single DFT to get to my desired end result. All the above said here comes my question... For the merge-joins and sorting I can basically use one of two approaches which I will describe as "serial" and "parallel".  "SERIAL" My

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Calculated field Sorting Now Working , but have performance question


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Also in order to get paging to work i had to rebind/filter the data again ... means looping through all 7000 records each time paging is called. This seems terribly ineffecient as i am already forced to use access instead of SQL.


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I'm currently getting to know the linqdatasource control. What would happen if several WHERE parameters are added to the linqdatasource control declaritively in the aspx page but no WHERE clause is defined? 

1. is there any issue with setting up multiple WHERE parameters in the aspx markup for linqdatasource but then deciding which ones actually get used at runtime by setting the actual WHERE clause at run time? Would the unused parameters simply be ignored and cause no issues?

2. when you need to modify WHERE clause or WHERE parameters at runtime do you need to do so in an event handler? such as linqdatasource.selecting?
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