Best way to sort a Table

Hi Gurus,
I'm using a EJB to read Data from a DB and write it into a Context Node "SourceNode" in my Component Controller.
In the View, I've got a Node "DisplayNode", which is not mapped to "SourceNode" and but is filled using a supplaymethod that uses WDCopyService to copy the content of "SourceNode" to "DisplayNode". In the View, I've got a Node "FilterNode" that holds the entered filter attributes and a Node "TempNode" for looping on the diffrent filter attributes.
So everytime filter attributes are entered, I reduce the content of "DisplayNode" and when the filter attributes are reseted, I copy back the hole "SourceNode" to "DisplayNode".
The question is, if there is a more efficient way to do this, since if my SourceNode hast got 10.000 an more entries, this gonna take long to filter and to reset filter.
Thanks in advance.
Helpful answers will be rewarded with points.

This is semi-related to my other post about the MINUS statement. The full query that I'm playing with can be viewed there.
Currently, two field of the table must be specified in the where clause of the query: a bank_account_id and a date range. There are 4 other fields that can be used to restrict the search results, but they are not expected to be a primary means of searching.
The anticipated number of records in the table at any given time is expected to be between 1 million and 1.5 million records spanning 50 bank accounts over a period of 3-6 months.
Currently the indexes that I have specify the bank account ID as the first field of every index followed by the fields in the order by clause (which include the date field).
-Shawn Smiley
null

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[Overwriting Several Lines Using an Internal Table|http://help.sap.com/saphelp_bw33/helpdata/en/fc/eb3a94358411d1829f0000e829fbfe/content.htm]
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Thanks ejp but initially if the combo box is not empty. that means if he did not typed any letter i will be displaying all the names.No. That's the mistake. Don't do that. A combobox with 1000 or 5000 items is completely useless.Do it the way I said.
My problem is if there are 5000 customers then what? will it not create a performance issue.Of course it will. It will also create a major performance issue for the user.
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