Oper account not created but how can i get sysoper privilege

Question

Hello Everyone ;
Hello Everyone ;
When installing oracle i did not create oper account.
now  i am checking my personal database;
SQL> show user;
USER is "SYS"
SQL> select * from system_privilege_map where name like '%SYS%';
PRIVILEGE  NAME      PROPERTY
  -3    ALTERSYSTEM    0
  -4    AUDIT SYSTEM  0
  -83    SYSDBA        0
  -84    SYSOPER 0
SQL> select count(*) from session_privs;
  COUNT(*)
  166
>> Connecting as sysoper
I   can connect  SYS  /as SYSOPER  but  this  session has only 3 privilegs - why ?
SQL> conn /as sysoper
Connected.
SQL> select count(*) from session_privs;
  COUNT(*)
  3
SQL> select * from system_privilege_map where name like '% SYS%';
PRIVILEGE NAME PROPERTY
  -3  ALTER SYSTEM  0
  -4  AUDIT SYSTEM  0
SQL> select * from session_privs;
PRIVILEGE
CREATE SESSION
RESTRICTED SESSION
SYSOPER
SQL> show user;
USER is "PUBLIC"
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
Even i did NOT create oper account for sys user then how can i get all sysoper privilege for public user.

Answer 1

Thanks for quick response;
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2659418700346202574
sysoper is another role, if you connect as sysoper, you'll be in a schema "public" a
i am getting confused  from  given link and your answer.
because  system is displaying  USER is "PUBLIC" .
when i review  (See $ORACLE_HOME/rdbms/lib/config.c in your installation).
/*  SS_DBA_GRP defines the UNIX group ID for sqldba adminstrative access.  */
/*  Refer to the Installation and User's Guide for further information.  */
#define SS_DBA_GRP "dba"
#define SS_OPER_GRP "dba"
char *ss_dba_grp[] = {SS_DBA_GRP, SS_OPER_GRP};
~
I am sorry for comparing both replies.
please clarify little more.