Error: "ORA-28009: connection as SYS should be as SYSDBA or SYSOPER" (4264655)

Error: "ORA-28009: connection as SYS should be as SYSDBA or SYSOPER"

Error: "ORA-28009: connection as SYS should be as SYSDBA or SYSOPER" when attempting to use the sys account as the functional account of a Oracle system.

ORA-28009 oracle error is raised when the sys user tries to connect without providing "as sysdba" . This is controlled by the O7_DICTIONARY_ACCESSIBILITY parameter. When this parameter value is set to FALSE, sys users experience this ORA-28009 error. Access to dictionary objects is restricted to the users with the system privileges SYSDBA and SYSOPER. Connecting as SYSDBA gives a user unrestricted privileges to perform any operation on a database or the objects within a database. Data dictionary objects is under SYS schema and is protected by O7_DICTIONARY_ACCESSIBILITY to FALSE settings.

BFER6461

Note that the ability to connect to Oracle using the SYS account via PSM -- BFER 6541 ("PSM session using SYS account not working for Oracle platforms.") was added in TPAM 2.5.921.