Oracle : Disable Archive Log

c:\>sqlplus /nolog
SQL*Plus: Release 10.2.0.2.0 – Production on Thu Apr 3 11:14:46 2008
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
SQL> connect sys/[PASSWORD]@[DB] as sysdba
Connected.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 1694498816 bytes
Fixed Size 2054072 bytes
Variable Size 687867976 bytes
Database Buffers 989855744 bytes
Redo Buffers 14721024 bytes
Database mounted.
SQL> alter database noarchivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination E:\oracle\QAS\oraarch\QASarch
Oldest online log sequence 939
Current log sequence 946
SQL> quit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 – 64
bit Production
With the Partitioning, OLAP and Data Mining options