My Oracle Support Banner

Instance start up reports ORA-27125: unable to create shared memory segment (Doc ID 1970546.1)

Last updated on MAY 12, 2021

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


The host ran out of disk space and ASM and the RDBMS were unable to create audit files.

The environment was shutdown to correct this.

After freeing up space the ASM instance is unable to start reporting the following errors

ASM Alert Log

Starting ORACLE instance (normal)
Thu Feb 12 16:09:45 2015
MEMORY_TARGET defaulting to 1128267776.
* instance_number obtained from CSS = 1, checking for the existence of node 0...
* node 0 does not exist. instance_number = 1
Starting ORACLE instance (normal)

Sqlplus reports:

[grid@<service_name> ~]$ sqlplus "/ as sysasm"

SQL*Plus: Release Production on Thu Feb 12 16:09:43 2015

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORA-27125: unable to create shared memory segment
Linux-x86_64 Error: 13: Permission denied
Additional information: 8388608
Additional information: 1


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

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

In this Document

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