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Don Burleson Blog 







ORA-01920: user name 'string' conflicts with another user or role name

Expert Oracle Database Tips by Donald BurlesonNovember 29, 2015

The error "ORA-01920: user name 'string' conflicts with another user or role name" occurs most commonly when creating users or assigning roles.

 The oerr utility notes this on the ORA-01920 error:

ORA-01920: user name 'string' conflicts with another user or role name

Cause: There is already a user or role with that name.

Action: Specify a different user name.

Common causes for the ORA-01920 error include:

  • Attempting to create a user that already exists
  • Attempting to assign a role that has already been assigned

The ORA-01920: user name 'string' conflicts with another user or role name prevents the creation of duplicate entries in the dba_users table.  If an ORA-01920 is returned during the attempted creation of a user, the dba_users table should be queried to determine what users already exist:

select owner, username from dba_users, order by 1;

At this point, resolving the ORA-01920 should be easy.  If the user does indeed already exist in the dba_users table, either use the existing user or create a user with a different user name.  Attempting to drop an existing user, particularly from a production database can be very tricky and dangerous.

ORA-01920 can also occur when attempting to assign user roles that have already been assigned.  Querying user_role_privs can help determine which roles have been assigned and by whom.

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