In this post, we are discussing about issue which I faced on fresh oracle software install.

[oracle@test1.test.com ] Ora:TEST2 $ sqlplus "/ as sysdba"
SQL*Plus: Release 11.2.0.4.0 Production on Mon May 30 12:30:31 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
ERROR:
ORA-01031: insufficient privileges

Normally this issue points to incorrect permissions on oracle binaries OR incorrect value for SQLNET.AUTHENTICATION_SERVICES in sqlnet.ora. But in my case both were correctly set.

After checking on metalink, I found following note related to the same issue, which explains different scenarios, on of them is if the OS user is part of the OSDBA group.

Troubleshooting ORA-1031 or ORA-1017 Errors When Connecting As SYSDBA (Doc ID 730067.1)

I tried to compare file “$ORACLE_HOME/rdbms/lib/config.s” with other oracle home where sqlplus “/ as sysdba” was working fine.

Note: config file name vary from OS to OS on some OS it is config.c and on some OS it is config.s

[oracle@test1.test.com ] Ora: TEST1 $ diff config.s /u01/app/oracle/TEST2/11.2.0.4/rdbms/lib/config.s
23c23
< .ascii "oinstall\0"
---
> .ascii "\0"

I found the culprit!!! In my new installation, Library file was missing group details. After making all necessary changes, I had to relink all oracle binaries.

For binary relink, perform following steps:

– Make sure that no oracle processes running
– Login as oracle
– Make sure LD_LIBRARY_PATH and ORACLE_HOME are set properly
– $ORACLE_HOME/bin/relink all

After binary relink, sqlplus “/ as sysdba” started working as expected.

Done!!!!!!!!!!

Hope so u will find this post very useful:-)

Cheers

Regards,

Adityanath