cmd>set ORACLE_SID=DBSID
cmd>sqlplus sys/passwd as sysdba;
SQL>SELECT LOG_MODE FROM SYS.V$DATABASE;
cmd>sqlplus sys/passwd as sysdba;
SQL>shutdown immediate
SQL>startup mount
SQL> startup mount
ORACLE instance started.
Total System Global Area 184549376 bytes
Fixed Size 1300928 bytes
Variable Size 157820480 bytes
Database Buffers 25165824 bytes
Redo Buffers 262144 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
cmd>rman target /
RMAN> list copy of archivelog until time 'SYSDATE-3';
RMAN> delete archivelog until time 'SYSDATE-3';//delete archivelog until sequence 999;