I installed oracle database on my windows 8.1 PC. I downloaded the zip files from oracle website viz. win64_11gR2_database_1of2 and win64_11gR2_database_2of2.

I followed the installation steps and while attempting to login through sysdba, i got the insufficient privileges issue. I used below command:

sqlplus "/as sysdba"

Please help me to resolve this issue.


2 Answers 2


There are some things which have to be set up correctly:

  1. The user you are logged on has to be a member of the ora_dba operating system group.
  2. The parameter SQLNET.AUTHENTICATION_SERVICES=(NTS) must be set correctly. It can include more options but "NTS" is required.
  3. You have to connect to the database correctly which is: sqlplus / as sysdba. You can also add these quotes but that was Oracle 9i style. But you need a space betweed "/" and "as".

Note: If you want to connect to Oracle as sysdba from a remote computer, you need a password file.

  • Also make sure your user is a member of Windows Group "ORA_DBA" Jan 5, 2015 at 17:46

In addition to what ora-600 posted: Did you create and Oracle service? Did you create a database? Can you find the diag directory for the database that you created and drill into the rdbms/SID_NAME/sid_name/trace directory? Installing software does not automatically give you a database. You need to create a database to have a database.

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