如果已经有当前的完整备份了，就把归档日志删掉（直接删除文件即可）！
如果想备份：
下面的脚本备份归档日志：
RMAN> run {
2> allocate channel dev1 type disk;
3> backup
4> format '/ora/backups/log_t%t_s%s_p%p'
5> (archivelog all);
6> release channel dev1;
7> }
下面的脚本归档日志从# 90 to 100：
RMAN> run {
2> allocate channel dev1 type disk;
3> backup
4> format '/ora/backups/log_t%t_s%s_p%p'
5> (archivelog from logseq=90 until logseq=100 thread 1);
6> release channel dev1;
7> }
下面的脚本备份在两天内产生的归档日志，在备份完成后会自动删除归档日志。如果备份失败，归档日志不会被删除。
RMAN> run {
2> allocate channel dev1 type disk;
3> backup
4> format '/oracle/backups/log_t%t_s%s_p%p'
5> (archivelog from time 'sysdate-2' all delete input);
6> release channel dev1;
7> }
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d.归档模式转换
archivedlog -noarchivedlog
setp1.shutdown clearly
setp2.startup mount
setp3.alter database archielog/noarchivelog
setp4.alter databse archivelog;
setp5.alter system archive log start(启动自动存档)[archive log start/alter system archive log all]
setp6.alter database open;