Richard Ji,您好！
Hi ， how do you know that ISM is used even if multiple shared memory
segment are used in solaris 8?
======= 2003-06-26 09:24:00 您在来信中写道：=======
>Matt,
>
>Your SGA can still be larger than 4G even if SHMMAX is not larger than
>4G. When SGA size > SHMMAX, mutilple shared memeory segements will
>be allocated. There used to be a claim that if you can fit the SGA
>into a single shared memory segment, ISM will be used. This might
>be true for older version of Solaris, but I have seen ISM being used
>even when mutiple shared memory segments are allocated on Solaris 8.
>
>Regards,
>
>Richard
>
>-----Original Message-----
>Sent: Thursday, June 26, 2003 10:55 AM
>To: Multiple recipients of list ORACLE-L
>
>
>
>As long as you're running 64-bit solaris and 64-bit oracle, you can set
>SHMMAX to be larger than 4G, which will allow your SGA to be larger than
>4G. Keep an eye on your overall memory pressure, though, to make sure
>you don't oversubscribe the system. If you're running Solaris 8/9
>and/or using some sort of direct i/o (raw devices, veritas, etc.) you're
>good to go at that point. If you're running 7 or 2.6 (can you even run
>2.6 and 7 on the 4800? I doubt it), you'll want to turn on
>priority_paging in /etc/system to keep your sga from getting paged out
>in favor of filesystem buffers.
>
>Thanks,
>Matt
>
>--
>Matthew Zito
>GridApp Systems
>Email: [EMAIL PROTECTED]
>Cell: 646-220-3551
>Phone: 212-358-8211 x 359
>http://www.gridapp.com
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>> Behalf Of Zhai Jingmin
>> Sent: Thursday, June 26, 2003 5:34 AM
>> To: Multiple recipients of list ORACLE-L
>> Subject: SHMMAX setting on Sun 4800 box
>>
>>
>> Hello, List,
>>
>> Our Sun Fire 4800 server have 8 CPUs and 16G memory.I set the
>> SHMMAX kernel parameter to 4294967295 according to
>> installation guide on metalink.The SHMMAX is "max shared
>> memory segment size".What's the relationship between SHMMAX
>> and max size of SGA?Because our oracle's SGA may exceed
>> 4G,can I set this parameter to 8G,10G?
>>
>> Any suggestion is appreciated.
>>
>> Thanks,
>>
>> Zhai Jingmin
>> [EMAIL PROTECTED]
>> 2003-06-26
>>
>>
>>
>> --
>> Please see the official ORACLE-L FAQ: http://www.orafaq.net
>> --
>> Author: Zhai Jingmin
>> INET: [EMAIL PROTECTED]
>>
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>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.net
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>Author: Matthew Zito
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>Author: Richard Ji
> INET: [EMAIL PROTECTED]
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= = = = = = = = = = = = = = = = = = = =
致
礼！
chao_ping
[EMAIL PROTECTED]
2003-06-27
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Author: chao_ping
INET: [EMAIL PROTECTED]
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