Why do they use flatfiles ???

Dear Experts....
In real world applications/warehouse....why do ppl use external tables for flat files ?
Is it because the data in flat file changes constantly ????
An reason...??? pls explain ?
rgds
s

Hi
Do you mean why use external table over SQLLoader? Oracle advises external table over SQLLoader, you can later the external table to point to another real file and read from it, you can also have many data files (configure external tables and add many data files) and read in parallel and also there are some cool features such as the pre-processor so you can read from compressed files or whatever (since the preprocessor can do whatever you want).
See the following on using the preprocessor with external tables in OWB 11gR1/10gR2
http://blogs.oracle.com/warehousebuilder/2009/06/file_staging_using_external_table_preprocessor.html
Or the following illustration using 11gR2;
http://blogs.oracle.com/warehousebuilder/2009/10/owb_11gr2_bulk_file_loading_-morefaster_easier.html
Cheers
David

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Why do they use flatfiles ???

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