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Oracle Tips by Donald BurlesonMay 3, 2017

Question: I am facing issues with the Oracle SGA file permissions in Oracle 12102 on AIX. I want to give a user which is not an Oracle user the read permissions for the Oracle shared memory.

 I found the parameter ALLOW_GROUP_ACCESS_TO_SGA and set it True but even after doing that the Group in which the Oracle user and my User are, does not have read permissions for the SGA files. These are the results of the ipcs -m command ->

m 428867627 0x37009593 --rw------- user1dba
m 832569392 0xffffffff D-rw------- user1 dba

Do I need to do anything special other than setting the parameter ALLOW_GROUP_ACCESS_TO_SGA=TRUE to provide the group read permissions ?

Answer:  The allow_group_access_to_sga is a Boolean (default FALSE), that allows read access for SGA to users of Oracle owner group (dba group).

The OS user is independent from the Oracle parameter ALLOW_GROUP_ACCESS_TO_SGA.
You need to use a user ID that belongs to the dba group (from /etc/groups).

The allow_group_access_to_sga only an effect if you try to access the SGA from the OS level, for example, when you are attaching to the shared memory segment.

In the pre 12c behavior an OS user being in the same group can attach and read from the SGA. With the new 12c release 1,  “600” protection only the OWNER can attach to it – and read out the SGA.

This is the standard behavior in Oracle Database and onward.

SQL> show parameter allow_group

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
allow_group_access_to_sga            boolean     FALSE


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