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RE: Disk Async IO

From: Kevin Closson <kevinc_at_polyserve.com>
Date: Wed, 6 Sep 2006 12:09:05 -0700
Message-ID: <5D2570CAFC98974F9B6A759D1C74BAD0E5AF44@ex2.ms.polyserve.com>

          

>Our UNIX SA says " Cooked Filesystems have their own
Asynchronous Mechanisim that equally replaces Oracle Async IO"          

    ...Uh, tell him to keep his day job. Having buffers copied into kernel buffers from the SGA so that bdflush can eventually get to them is in no way a tradeoff for Oracle making async I/O calls. Not to mention,
all the important writes (dbwr,lgwr) are synced (either with open(,O_SYNC,) or
fsync so the topic is nonsensical.

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Received on Wed Sep 06 2006 - 14:09:05 CDT

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