My Oracle Support Banner

How are the Number of Semaphores per set Calculated on a Unix platforms? (Doc ID 261421.1)

Last updated on AUGUST 10, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 8.1.5.0 to 9.2.0.1 [Release 8.1.5 to 9.2]
Information in this document applies to any platform.
Information in this document applies to any platform.

Goal

With the following parameters given, how are the number of semaphores needed by Oracle, calculated?

Unix kernel parameters:

SEMMNI = 100 # semaphore identifiers
SEMMSL = 50 # max semaphores per id or set
SEMMNS = 500 # semaphores in system

Oracle parameter:

PROCESSES=150

Solution

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.