Getting ORA-27123 & not able to run Oracle when logging to server by a user other than that installed Oracle although it belongs to the same group (Doc ID 730107.1)

Last updated on AUGUST 26, 2013

Applies to:

Oracle Database - Enterprise Edition - Version 8.1.7.4 to 10.2.0.4 [Release 8.1.7 to 10.2]
Information in this document applies to any platform.
This problem can occur on any platform.

Symptoms

When trying to connect "/ as sysdba" with a Unix user who belongs to group "dba" (but is not the user who installed Oracle), the following errors are reported:
ORA-27123: unable to attach to shared memory segment
SVR4 Error: 13: Permission denied

Cause

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