HP-UX Buffer Cache

From: Ed Bittel <ebittel_at_yahoo.com>
Date: Fri, 23 Jun 2000 09:10:36 -0700
Message-Id: <10537.110250@fatcity.com>

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I have a HP9000 server running HP-UX 11.0 with Oracle 8.0.5.=20

I've been reviewing memory usage stats with my SA. Our server has 2GB = of physical memory, with 1GB reserved for the HP-UX buffer cache and 1GB = available to users (i.e., Oracle). I've read in the Administrator's = Reference manual, that Oracle does not need to use the HP-UX buffer = cache if the system is using raw devices. I have been unable to find = any good information on how to size the HP-UX buffer cache when using = file systems. =20

Because we're getting a little tight on memory, I'm wondering if it is = possible and/or advisable to reduce the size of the HP-UX buffer cache = to free up additional memory for user processes. What effect would this = have on system and database performance? Any other recommendations or = comments on this subject would be appreciated.

Thanks,=20

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<DIV><FONT size=3D2>I have a HP9000 server running HP-UX 11.0 with =
Oracle=20
8.0.5. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I've been reviewing memory usage stats with my =
SA.  Our=20
server has 2GB of physical memory, with 1GB reserved for the HP-UX = buffer cache=20
and 1GB available to users (i.e., Oracle).  I've read in the=20 Administrator's Reference manual, that Oracle does not need to use the = HP-UX=20
buffer cache if the system is using raw devices.  I have been = unable to=20
find any good information on how to size the HP-UX buffer cache when = using file=20
systems.  </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Because we're getting a little tight on =
memory, I'm=20
wondering if it is possible and/or advisable to reduce the size of the = HP-UX=20
buffer cache to free up additional memory for user processes.  =
</FONT><FONT=20

size=3D2>What effect would this have on system and database = performance?  Any=20
other recommendations or comments on this subject would be=20 appreciated.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Thanks, </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Ed</FONT></DIV></BODY></HTML>

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