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тАО04-07-2010 01:46 PM
тАО04-07-2010 01:46 PM
Why do I have 5 shared memory segments
I installed oracle using all of the default installation parameters.
I created a database using dbca and unselected use enterprise manager and set the SGA to 1 GB.
Unlike oracle 10G I now have 5 shared memory segments instead of 1. My shmmax is set to 2 GB so my SGA is only using 1 shared memory segment. Any idea what the other segments are used for .
Points will be generous. Replies appreciated
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тАО04-07-2010 11:22 PM
тАО04-07-2010 11:22 PM
Re: Why do I have 5 shared memory segments
_enable_NUMA_optimization=FALSE
in the Oracle parameter file...
See metalink note nr. 399261.1
Unix operates with beer.
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тАО04-07-2010 11:27 PM
тАО04-07-2010 11:27 PM
Re: Why do I have 5 shared memory segments
I had a customer say that I should not have multiple shared memory segments even at 11.1
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тАО04-08-2010 11:38 AM
тАО04-08-2010 11:38 AM
Re: Why do I have 5 shared memory segments
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тАО04-12-2010 01:01 AM
тАО04-12-2010 01:01 AM
Re: Why do I have 5 shared memory segments
ipcs -mac
should give you the owner and the creator of the process using that shared memory segment.
Maybe not all shared memory segments from your system are created by Oracle.
Horia.
Horia.
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тАО04-12-2010 03:45 AM
тАО04-12-2010 03:45 AM
Re: Why do I have 5 shared memory segments
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тАО04-12-2010 04:11 AM
тАО04-12-2010 04:11 AM
Re: Why do I have 5 shared memory segments
How big is SEGSZ reported by ipcs?
Horia.
Horia.
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тАО04-12-2010 04:20 AM
тАО04-12-2010 04:20 AM
Re: Why do I have 5 shared memory segments
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тАО04-12-2010 04:50 AM
тАО04-12-2010 04:50 AM
Re: Why do I have 5 shared memory segments
Can you post your kernel configuration parameters here?
Horia.
Horia.
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тАО04-12-2010 04:52 AM
тАО04-12-2010 04:52 AM
Re: Why do I have 5 shared memory segments
I lost system so I need to rebuild the oracle instance.
Kernel paramater shmmax was 2 GB which was larger than the 1.2 GB of SGA that was configured when I installed oracle.
all kernel parameters were set by tune-n-tools which set them correct for oracle