ORA-01075 you are currently logged on

$ sqlplus "/as sysdba"
 
SQL*Plus: Release 9.2.0.1.0 - Production on Tue Mar 9 14:05:49 2010
 
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
 
ERROR:
ORA-01075: you are currently logged on

ACTION

$ echo $ORACLE_SID
SSEAST1

$ ps -ef|grep SSEAST1

 oracle1  7597     1  0 13:15:35 ?         0:00 ora_lgwr_SSEAST1
 oracle1  7595     1  0 13:15:35 ?         0:00 ora_dbw0_SSEAST1
 oracle1  7593     1  0 13:15:35 ?         0:00 ora_pmon_SSEAST1
 oracle1 20020 16013  1 14:11:15 pts/ta    0:00 grep SSEAST1
 oracle1  7601     1  0 13:15:36 ?         0:00 ora_smon_SSEAST1
 oracle1  7599     1  0 13:15:35 ?         0:00 ora_ckpt_SSEAST1
 oracle1  7603     1  0 13:15:36 ?         0:00 ora_reco_SSEAST1
 oracle1 19341     1  0 14:10:46 ?         0:00 oracleSSEAST1 (LOCAL=NO)
 oracle1  7605     1  0 13:15:36 ?         0:00 ora_cjq0_SSEAST1

$ kill -9 7593

 Solution
Killed PMON ,SMON pids