[oracle@localhost archive]$ cd
[oracle@localhost ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.3.0 - Production on Mon Nov 22 11:11:14 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
SQL> conn /as sysdba
Connected.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/app/oracle/archive
Oldest online log sequence 109
Next log sequence to archive 111
Current log sequence 111
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 1.0737E+10 bytes
Fixed Size 2090600 bytes
Variable Size 1560283544 bytes
Database Buffers 9160359936 bytes
Redo Buffers 14684160 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 /u01/app/oracle/archive
Oldest online log sequence 109
Current log sequence 111
SQL>