RE: Oracle internal flaws?
- From: D'Hooge Freek <Freek.DHooge@xxxxxxxxx>
- To: "Mark.Brady@xxxxxxxxxxxxxxxxx" <Mark.Brady@xxxxxxxxxxxxxxxxx>
- Date: Tue, 15 Mar 2011 15:32:01 +0100
"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."
This guy seems to have never heard about the buffer cache, directIO and ASM
(and long before ASM, people where running oracle databases on raw devices).
"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."
No idea what his problem with this is.
To me, process handling is something that is the responsibility of the OS. And
which is something that differs from platform to platform.
To my knowledge the other RDBMS systems work on the same way (don't know if
there any niche products which are doing this).
In short, this guy is full of ...
Regards,
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Brady, Mark
Sent: dinsdag 15 maart 2011 15:09
Cc: oracle-l@xxxxxxxxxxxxx
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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