RE: Oracle internal flaws?
Date: Tue, 15 Mar 2011 10:39:59 -0400
Message-ID: <1B861F1ABE40A84AA92AD585B20C558B26F808CCA0_at_EX7T2-CV06.TDBFG.COM>
the one comment to that post I think answers it all... :-)
Rui Amaral
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From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Joel Slowik Sent: Tuesday, March 15, 2011 10:35 AM
To: Mark.Brady_at_Constellation.Com
Cc: oracle-l_at_freelists.org
Subject: RE: Oracle internal flaws?
This stuck out to me:
"Especially noteworthy, because it uses file system files (not raw partitions), and the "caching" is outside, it relies heavily on (and is very sensitive to) the file system cache that you have set up. likewise, Oracle needs a massive amount of memory for these processes."
That's true if you are using ASM or the file system to manage data files. When creating a database, you can specify to oracle to use raw partitions as a storage mechanism.
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Brady, Mark
Sent: Tuesday, March 15, 2011 10:09 AM
Cc: oracle-l_at_freelists.org
Subject: Oracle internal flaws?
I saw this answer today on StackOverflow.
http://stackoverflow.com/questions/5307590/cpu-usage-of-oracle-installed-database-machine
Quote from PerformanceDBA, a notable Oracle basher.
"Oracle does not have a true server architecture (others have it). Rather than performing classic server tasks, such as multi-threading, caching of data pages, parallel processing (split a query across many devices) etc. within itself, it uses the o/s to do all that. That means for each user process (PL/SQL connection) there is one unix process; 1000 users means 1000 unix processes, all competing for the same resources. Especially noteworthy, because it uses file system files (not raw partitions), and the "caching" is outside, it relies heavily on (and is very sensitive to) the file system cache that you have set up. likewise, Oracle needs a massive amount of memory for these processes."
I'm not enough of an internals guy to accurately refute these declarations. Can anyone help me understand which of these statements are true and whether or not they are deficiencies?
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