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Oracle - UNIX and Oracle  parameters

Oracle Database Tips by Donald Burleson

Oracle MOSC Note Relationship Between Common Init.ora Parameters and Unix Kernel Parameters, has a great summary of Oracle kernel related UNIX/Linux parameters:


Init.ora Parameter

Unix Kernel Parameter



db_files   (maxdatafiles)

nfile, maxfiles






nproc, semmsl, semmns




The following Kernel Parameters tend to be generic across most Unix platforms.  However, their names may be different on your platform.  Consult your Installation and Configuration Guide (ICG) for the exact names.

maxfiles - Soft file limit per process.
maxuprc - Maximum number of simultaneous user processes per userid.
nfile - Maximum number of simultaneously open files systemwide at any given time.
nproc - Maximum number of processes that can exist simultaneously in the system.
shmmax - The maximum size(in bytes) of a single shared memory segment.
shmmin - The minimum size(in bytes) of a single shared memory segment.
shmmni - The number of shared memory identifiers.
shmseg - The maximum number of shared memory segments that can be attached by a process.
semmns - The number of semaphores in the system.
semmni - The number of semaphore set identifiers in the system; determines the number of semaphore sets that can be created at any one time.
semmsl - The maximum number of sempahores that can be in one semaphore set. It should be same size as maximum number of Oracle processes.

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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