shmall on Linux recommendation
- From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
- To: "Oracle L" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 12 Jan 2010 09:54:27 -0600
Folks, I've inherited a 4-node RAC plus DG environment that has a rather
curious shmall setting that I'd appreciate your thoughts on. I've done my best
to understand it's current setting but those that made the decision are no
longer with the company and/or client.
The system is running 10.2.0.2 on RHEL 4. Like I said, it's a 4-node RAC, 64
GB RAM, with the same for a physical standby. Currently the SGA of each
instance is 17 GB.
The install guide gives a minimum value of 2097152 (8 GB) while the current
value is 25165824 (96 GB). To me it seems just a wee bit aggressive to be
setting the total shared memory to be RAM + swap! MOS doc 301830.1 gives the
recommendation of the SUM SGAs on the server, so in this case 4456448 (17 GB).
Sizing shmall to be the SUM of the SGAs on the server makes sense, but I'm
curious if anyone has experience that suggests otherwise? Also, can anyone
think of a good reason to set shmall to RAM + swap (other than "'cuz it's
there")?
Thx.
Dave Herring | DBA, Acxiom Database Services
630-944-4762 office | 630-430-5988 cell | 630-944-4989 fax
1501 Opus Pl | Downers Grove, IL, 60515 | U.S.A. | www.acxiom.com
Service Desk: 888-243-4566
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