SHOW PARAMETER AUDIT
ALTER SYSTEM SET audit_trail=db SCOPE=SPFILE;

System altered.

SQL> SHUTDOWN
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> STARTUP
ORACLE instance started.

Total System Global Area  289406976 bytes
Fixed Size                  1248600 bytes
Variable Size              71303848 bytes
Database Buffers          213909504 bytes
Redo Buffers                2945024 bytes
Database mounted.
Database opened.

CONNECT sys/password AS SYSDBA
SQL> conn sys/sys as sysdba;
Connected to an idle instance.
SQL> CREATE USER audit_test IDENTIFIED BY audit_test1
  2    DEFAULT TABLESPACE users
  3    TEMPORARY TABLESPACE temp
  4    QUOTA UNLIMITED ON users;
CREATE USER audit_test IDENTIFIED BY audit_test1
*
ERROR at line 1:
ORA-01012: not logged on


SQL> shutdown
ORA-24324: service handle not initialized
ORA-24323: value not allowed
ORA-01090: shutdown in progress - connection is not permitted
SQL> startup
ORA-01031: insufficient privileges
SQL> conn sys/sys as sysdba;
Connected to an idle instance.
SQL> CREATE USER audit_test IDENTIFIED BY audit_test1
  2    DEFAULT TABLESPACE users
  3    TEMPORARY TABLESPACE temp
  4    QUOTA UNLIMITED ON users;
CREATE USER audit_test IDENTIFIED BY audit_test1
*
ERROR at line 1:
ORA-01012: not logged on


SQL> shutdown
ORA-24324: service handle not initialized
ORA-24323: value not allowed
ORA-01090: shutdown in progress - connection is not permitted
SQL> startup
ORA-01031: insufficient privileges
SQL> 
can anyone help me why its happening like this

SQL> shutdown
ORA-24324: service handle not initialized
ORA-24323: value not allowed
ORA-01090: shutdown in progress - connection is not permitted