Raw versus fs : Pure provocation or real knowledge ?

While I was reading an article on :

http://www.ixora.com.au/tips/creation/raw_datafiles.htm

I found :

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All operating systems maintain a read/write lock for each file system based datafile. Read/write locks allow multiple concurrent readers, but ensure exclusive access for each writer. This means that concurrent readers and writers must contend for file access.
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It is first time I hear than Unix is doing exclusive flock() to update an Oracle file. The article is so interesting, and the author is so obviously commited to RAW devices, than it is worth clarifying this point.

Does anybody has enough knowlegde (and guts) to assert or not this point ?

B. Polarski

http://www.geocities.com/bpolarsk
Email : bpolarsk_at_yahoo.com

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Before you buy. Received on Mon Feb 21 2000 - 11:48:20 CST