Understanding buffered i/o and direct i/o

Oracle documentation, it seems that direct i/o is recommended compare with buffer I/O

http://download.Oracle.com/docs/CD/E10530_01/doc/EPM.931/html_esb_dbag/frameset.htm?dstcache.htm

Understanding buffered i/o and direct i/o

The nucleus of Essbase uses buffer IO (input/output) by default, but direct i/o is available on most operating systems and file systems that support the Essbase. For the list of supported platforms, see the Hyperion Essbase - 9 Installation Guide.

I/O buffering uses the file system buffer cache.

Direct i/o bypasses the file system buffer cache and is able to perform the asynchronous i/o, overlapped. The following services are provided:

* More rapid response time. A user waiting less time for Essbase return data.
* Scalability and predictability. Essbase allows you to customize sizes optimal cache for its databases.

http://download.Oracle.com/docs/CD/E10530_01/doc/EPM.931/html_esb_dbag/frameset.htm?dstcache.htm
If you use direct i/o, generally the largest index cache that the system resources allow. If you use I/O in the buffer, making the cache index as small as possible.

http://download.Oracle.com/docs/CD/E10530_01/doc/EPM.931/html_esb_techref/config/indexcachesize.htm
* An integer expressed in bytes (B), in kilobytes (KB), Mo (M), or gigabytes (G)
* Minimum value: 1 megabyte (1 M)
* Maximum value: 2 gigabytes (2 G)
* Default value: 10 MB (10 M)
* If a value is given without qualifier B, K, M, or G, it is assumed that the value is in bytes.
* The qualifier can be uppercase or lowercase, and can be entered adjacent value (10M) or separated by one space (10 M).

We are now using I/O buffers, so it's average must be set to the size of the key cache as small as possible? that is 1 MB?

I know we have a thread going on index caches elsewhere but I will repeat what I heard and seen - almost no one uses direct i/o. I will also pass on this - I heard that in some cases he peut be faster, but yet once, it is not commonly used.

This is the default for awhile (Essbase 6 x, I think) and was so buggy, misunderstood, etc, etc, he's got a reputation contaminated. Of course, Hyperion/Oracle have had enough time to solve the problems and I don't think that buggy is the problem any longer, but again, this is not the default mode.

Re your index caches sizing - if it was my task, I would determine that a collection representative of the calculations can be, compare their times with the current of the cache, the cache of low index settings, stop the db, restart the db, reference again, and then do the same for all (or like) the index in memory long live. <--That is="" the="" true="" path="" to="" index="" size="" enlightenment.="" i="" would="" do="" the="" above="" for=""> each cache setting and I do for each database - they are all different.

BTW, this is for the world of the OSB.

Kind regards

Cameron Lackpour

Tags: Business Intelligence

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