SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence
Current log sequence
SQL> shutdown immediate;
Database closed
Database dismounted
ORACLE instance shut down
SQL> startup mount;
ORACLE instance started
Total System Global Area
Fixed Size
Variable Size
Database Buffers
Redo Buffers
Database mounted
SQL> alter database archivelog;
Database altered
SQL> alter database open;
Database altered
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence
Next log sequence to archive
Current log sequence
SQL> archive log start;
Statement processed
SQL> startup mount;
SQL> alter database noarchivelog;
SQL> alter database open;
log_archive_start = true
From:http://tw.wingwit.com/Article/program/Oracle/201311/17367.html