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Can the output file be written to the file systems buffer cache?

April 26, 2017buffer cache file output system written

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Can the output file be written to the file systems buffer cache?

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Yes, this is what happens if you are using normal (non-direct or unbuffered) writes. In this case your sort program should flush the output file to disk before exiting. The entire output file must be written to disk during the elapsed time measured for the sort.