Oracle-L: Unrecognized shared memory "entry"

From: Louis Avrami <avramil_at_concentric.net>
Date: Mon, 11 Mar 2002 09:09:17 -0800
Message-ID: <F001.00424B6B.20020311090917@fatcity.com>

Hi folks,

We're running an Oracle 8.1.7.2 database on a Sun 420R, Solaris 2.6.

Recently we had a look at the shared memory allocation via the 'ipcs -a'
command and noticed that there is a "no-entry" listing in the semaphore
section:

$ ipcs -a

IPC status from <running system> as of Sun Mar 10 15:07:42 2002 Message Queue facility not in system.

T         ID      KEY        MODE        OWNER    GROUP  CREATOR
CGROUP NATTCH      SEGSZ  CPID  LPID   ATIME    DTIME    CTIME
Shared Memory:
m          0   0x50000a88 --rw-r--r--     root     root     root
root      1         68   248   248 21:24:00 21:24:00 21:24:00
m       1301   0x03309dc4 --rw-rw----   oracle      dba   oracle
dba     15  687087616 14289 14409 15:06:06 15:06:08 15:04:26
T         ID      KEY        MODE        OWNER    GROUP  CREATOR

CGROUP NSEMS OTIME CTIME
Semaphores:
s 3801088 0xe8945334 --ra-ra---- oracle dba oracle dba 152 15:05:09 15:04:36
s 1048577 0xe8945335 --ra-ra---- oracle dba oracle dba 152 no-entry 15:04:36
s 851970 0xe8945336 --ra-ra---- oracle dba oracle dba 152 15:04:39 15:04:36

This doesn't appear on any of our other Solaris 2.6, 2.7 or 2.8 servers.

Does anyone know what the "no-entry" semaphore listing means?

The specific OS version is:

$ uname -a

SunOS scmsdb01 5.6 Generic_105181-29 sun4u sparc SUNW,Ultra-60

Lou Avrami

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Author: Louis Avrami
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Received on Mon Mar 11 2002 - 11:09:17 CST