09-17-2008
estimating memory usage by database processes
Hi Guys,
I wonder what would be the best way to determine how much memory is in use on any given time by the database processes. I thought about using ipcs -m command but I wonder if there any better way to determine this. Thanks.
Harby.
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IPCS(1) User Commands IPCS(1)
NAME
ipcs - provide information on IPC facilities
SYNOPSIS
ipcs [resource-option] [output-format]
ipcs [resource-option] -i id
DESCRIPTION
ipcs provides information on the inter-process communication facilities for which the calling process has read access.
OPTIONS
-i, --id id
Print details only on the resource identified by id.
-h, --help
Display a help text and exit.
-V, --version
Display version information and exit.
Resource options
-q, --queues
Write information about active message queues.
-m, --shmems
Write information about active shared memory segments.
-s, --semaphores
Write information about active semaphore sets.
-a, --all
Write information about all three resources (default).
Output formats
Of these options only one takes effect: the last one specified.
-c, --creator
Show creator and owner.
-l, --limits
Show resource limits.
-p, --pid
Show PIDs of creator and last operator.
-t, --time
Write time information. The time of the last control operation that changed the access permissions for all facilities, the time of
the last msgsnd() and msgrcv() operations on message queues, the time of the last shmat() and shmdt() operations on shared memory,
and the time of the last semop() operation on semaphores.
-u, --summary
Show status summary.
Representation
These affect only the -l (--limits) option.
-b, --bytes
Print sizes in bytes.
--human
Print sizes in human-readable format.
SEE ALSO
ipcrm(1), ipcmk(1), msgrcv(2), msgsnd(2), semget(2), semop(2), shmat(2), shmdt(2), shmget(2)
CONFORMING TO
The Linux ipcs utility is not fully compatible to the POSIX ipcs utility. The Linux version does not support the POSIX -a, -b and -o
options, but does support the -l and -u options not defined by POSIX. A portable application shall not use the -a, -b, -o, -l, and -u
options.
AUTHOR
Krishna Balasubramanian <balasub@cis.ohio-state.edu>
AVAILABILITY
The ipcs command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux January 2013 IPCS(1)