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Mladen Gogala discusses direct I/O for Oracle

Mladen Gogala, author of "Easy Oracle PHP" has published an excellent paper on direct I/O for Oracle:
Gogala concludes that direct I/O for Oracle is most beneficial in cases where the server experiences high paging activity (page-in in vmstat) and a large percentage of CPU time spent in kernel mode:
"What are the indications for looking into the direct I/O? When should you start thinking about it, in the first place? The most significant indication is significant paging activity and large percent of CPU time spent in the kernel mode. That can diagnosed by using utilities like “sar” or “top”.
Never make changes which are not needed. If your system is not spending large amount of CPU time in kernel, it is unlikely that the introduction of direct I/O will have any positive effect on your system."

Mladen's new book is available here:



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