oracle冗余度2,rman中REDUNDANCY参数的设置似乎对归档日志的备份集不产生作用？

oracle冗余度2,rman中REDUNDANCY参数的设置似乎对归档日志的备份集不产生作用？

自己的一个库，备份冗余设置的为2， 备份脚本如下

://wwwdba/tianxiadishi/article/3016

run{

CONFIGURE RETENTION POLICY TO REDUNDANCY 2;

allocate channel t1 type disk;

allocate channel t2 type disk;

allocate channel t3 type disk;

configure controlfile autobackup on;

configure controlfile autobackup format for device type disk to '/home/oracle/test/jmgs_%T_control_%F_yhc01';

backup database format '/home/oracle/test/jmgs_%T_datafile_%d_%u_%t_%U_yhc';

sql'alter system switch logfile';

sql'alter system archive log current';

backup as compressed backupset archivelog all format '/home/oracle/test/jmgs_%T_archive_%d_%u_%t_%U_yhc';

report obsolete;

Delete noprompt obsolete;

crosscheck backup;

delete noprompt expired backup;

crosscheck archivelog all;

delete noprompt expired archivelog all;

release channel t1;

release channel t2;

release channel t3;

}

这个脚本执行多次，://wwwdba/tianxiadishi/article/3016://wwwdba/tianxiadishi/article/3016

结果如下：

1.当数据文件、控制文件和参数文件，只要超过三份，就会把最早的那个备份集删除掉，

2.归档日志的备份集，通过以上脚本，冗余度超过2份以上，也不会删除，

请问大师，这个情况是正常的吗？

crosscheck backup;

delete noprompt expired backup;

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