How to refresh the content of an external file

Hi guys.
I need to use an external file, no matter the extension(txt .xls .xml .mdb .csv) in the oracle BI rpd.
I Use this file like a center table in my star schema and this file need to refresh frequently.
How i can see, dynamically, the changes in the file without restart the services?I've tried by Answer to see all the record in the file, but if i change the file content and after, by answer, try to see the content.... it's the same as first!
I can do something to overcome this problem? or i have to use external table??
Thanks in advance.
Best reguards

It seems to me that you are trying to reinvent the wheel here. Having the BI Server load a 100,000 rows file is nto a good idea. The BI Server is not an ETL tool. While I could see why you may want to refresh the file frequently a better process would be to load it using standard ETL tools, create indexes etc and the move it to current table for OBIEE to see. You can use the OBIEE's Event Polling to clear the cache. Another simpler option if you are using an Oracle database is to use external tables. External tables allow you to define a table in an Oracle database that it's source is a text file. Google it and you will plenty of samples.

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