delete obolete 不能加从句吗？
还是delete obolete 只是针对备份集？
delete obolete copy;
delete obsolete backup;
这两个都不行，而下面的可以：
delete expired copy;
delete expired backup;
先弄懂这两个expired obolete区别：
expired 标示 备份被手工删除或损坏。
obolete 是指备份过期了。
delete obolete 不能加从句
delete obolete 针对过期 的备份集和副本。
You can automatically delete obsolete backups and copies by issuing the DELETE OBSOLETE command. For example, you can enter:
# delete obsolete backups and copies displayed when you issue REPORT OBSOLETE
DELETE OBSOLETE;
# delete obsolete backups and copies according to a specified recovery window
DELETE OBSOLETE RECOVERY WINDOW OF 7 DAYS;
# delete obsolete backups and copies according to a specified redundancy
DELETE OBSOLETE REDUNDANCY = 2;
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