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тАО07-18-2006 09:07 AM
тАО07-18-2006 09:07 AM
WARNING:Oracle instance running on a system with low open file descriptor
We have an Oracle database running on HPUX box, having the below warning in the alert.log file. Any help please?
WARNING:Oracle instance running on a system with low open file descriptor
limit. Tune your system to increase this limit to avoid
severe performance degradation
Kernel parameters for file related are as below:
maxfiles 2048 - 2048
maxfiles_lim 2048 Y 2048
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тАО07-18-2006 09:14 AM
тАО07-18-2006 09:14 AM
Re: WARNING:Oracle instance running on a system with low open file descriptor
file descriptors. When a process approaches this limit, the only alternative (other than failing to open a file) is to close a file. This means than many open()'s and close()'s will be required. You can increase these values using SAM and build a new kernel. You should probably have a look at nfile which is the system-wide number of open files but 10 processes can have the same file open and that only counts as 1 file with respect to the nfile limit.
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тАО07-18-2006 09:15 AM
тАО07-18-2006 09:15 AM
Re: WARNING:Oracle instance running on a system with low open file descriptor
Increase these two variables by another 25%, and also review the "nfile" variable in the kernel. You'd review that with the "sam" tool, make your changes, let it rebuild the kernel, and then it will require a reboot to complete.
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тАО07-18-2006 09:38 AM
тАО07-18-2006 09:38 AM
Re: WARNING:Oracle instance running on a system with low open file descriptor
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тАО07-18-2006 09:46 AM
тАО07-18-2006 09:46 AM
Re: WARNING:Oracle instance running on a system with low open file descriptor
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тАО07-18-2006 04:57 PM
тАО07-18-2006 04:57 PM
Re: WARNING:Oracle instance running on a system with low open file descriptor
nfiles: Maximum number of open files
This value is usually determined by the formula: ((NPROC*2)+1000)
NPROC is usually: ((MAXUSERS*5)+64)
For a MAXUSERS of 400, this works out to 5128. You can usually set it higher.
maxfiles: Soft file limit per process
For Oracle, you can estimate the required number of file descriptors (nofiles) with the following formula:
Total number of file descriptors required =
Parameter DB_FILES * 2 + Provision for controlfiles + provision for log files + Some buffer for other files (traces, etc)
maxfiles_lim: Hard file limit per process 2048 is the maximum value you can set through SAM for maxfiles and maxfiles_lim.
sks
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тАО02-06-2007 09:08 PM
тАО02-06-2007 09:08 PM
Re: WARNING:Oracle instance running on a system with low open file descriptor
Oracle instance running on a system with low open file descriptor limit. Tune your system to increase this limit to avoid severe performance degradation.
Could you please help me to tune maxfiles parameter? increasing only this parameter or other parameters?
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тАО02-07-2007 02:02 AM
тАО02-07-2007 02:02 AM
Re: WARNING:Oracle instance running on a system with low open file descriptor
maxfiles 3072 - 3072
maxfiles_lim 4096 Y 4096