1. database 정상종료

2. vi init<SID>.ora
log_archive_start = true
log_archive_dest_1 = "location=/opt/oracle/arch/log MANDATORY"
log_archive_dest_2 = "location=/opt/oracle/arch/log2 OPTIONAL"
log_archive_dest_3 = "location=/opt/oracle/arch/log3 OPTIONAL"
log_archive_format = "%s.ARC"
log_archive_min_succeed_dest=2

3. startup mount

4. alter database archivelog;

5. alter database open;