How to Check Current Shared Memory, Semaphore Values for oracle database?

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ram.jpgOracle uses UNIX resources such as shared memory and semaphores extensively for IPC interprocess communication. If your parameter kernel settings are insufficient for Oracle,then you will experience problems during installation and instance startup. Review your kernel parameter settings to ensure that they meet Oraclerequirements.

- These semaphore kernel parameters are mandatory to check:

[code lang="bash"]SEMMSL - Defines the maximum number of semaphores in a semphore set.
SEMMNS - Defines the maximum number of semphores in the system
SEMOPM - Defines the maximum number of operations per semop call.
SEMMNI - Defines the maximum number of semaphore sets in the entire system. [/code]

Minimum values required:
SEMMSL = 100
SEMMNS = 256
SEMOPM = 100
SEMMNI = 100

You can verify the actual values of these by this command:
[code lang="bash"]
# cat /proc/sys/kernel/sem
[/code]
The output lists, in order,
the values for the SEMMSL, SEMMNS, SEMOPM, and SEMMNI parameters.
The following example shows how the output appears:

250 256000 32 1024

You can change these values by the following command syntax:

[code lang="bash"] # cd /proc/sys/kernel
# echo SEMMSL_value SEMMNS_value SEMOPM_value SEMMNI_value > sem [/code]

- This shared memory segments kernel parameters are mandatory to check:

SHMMAX – Defines the maximum size of one shared memory segment
SHMMNI – Defines the maximum number of shared memory segments in the system
SHMSEG – Defines the maximum number of shared memory segments one process can attach.
SHMALL – Defines the maximum total shared memory system wide.

Minimum values required:
SHMMAX = 2147483648
SHMMNI = 100

You can verify the actual values of these by this command:

[code lang="bash"] # cat /proc/sys/kernel/shmmax
# cat /proc/sys/kernel/shmmni [/code]

The following example shows how the output appears:

[code lang="bash"] # cat /proc/sys/kernel/shmmax
2147483648

# cat /proc/sys/kernel/shmmni
4096 [/code]

You can change these values by the following command syntax:

[code lang="bash"] # cd /proc/sys/kernel
# echo SHMMAX_value > shmmax
# echo SHMMNI_value > shmmni [/code]

For Linux, use the ipcs command to obtain a list of the system?s current shared
memory segments and semaphore sets, and their identification numbers and owner.

1. To find out the currently configured semaphore limits:
[code lang="bash"] # ipcs -ls [/code]

The following example shows how the output appears:

[code lang="bash"] ------ Semaphore Limits --------
max number of arrays = 1024 <==== semmni
max semaphores per array = 250 <==== semmsl
max semaphores system wide = 256000 <==== semmns
max ops per semop call = 32 <==== semopm
semaphore max value = 32767 [/code]

2. To find out the currently configured shared memory limits:
[code lang="bash"] # ipcs -lm

------ Shared Memory Limits --------
max number of segments = 4096 <==== shmmin
max seg size (kbytes) = 32768 <==== shmmax
max total shared memory (kbytes) = 8388608 <==== SHMALL
min seg size (bytes) = 1 <==== SHMSEG [/code]

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