带库或VTL作为关键业务的备份，虽在普通用户接触较少，但总体使用量还是比较大。

很多实例在做专业备份软件的同时会采用disk方式在本地或共享地址上再备一次，如果专业备份软件采用的是带库或VTL方式进行存储，在cross check后发现存在大量的备份集仍然无法删除，可以参考本文。

export ORACLE_SID=bzzh1
date >> /home/oracle/rman_log/rman_delete.log
rman target / append << EOF
configure device type disk parallelism 16;
allocate channel for maintenance device type disk;
run
{
crosscheck backup;
delete expired backup;
crosscheck archivelog all;
delete noprompt obsolete device type disk;
delete noprompt expired archivelog all;
}
release channel;

##for TAPE##
allocate channel for maintenance device type 'sbt_tape';
run
{
crosscheck backup;
delete expired backup;
crosscheck archivelog all;
delete noprompt obsolete device type 'sbt_tape';
delete noprompt expired archivelog all;
}
release channel;

EOF
date >> /home/oracle/rman_log/rman_delete.log

需要注意，仅当backupset的Device Type为SBT_TAPE是参考本文才有意义。

BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
3177 Incr 0 256.00K SBT_TAPE 00:00:47 30-JUL-15
BP Key: 3137 Status: AVAILABLE Compressed: NO Tag: HOT_DB_BK_LEVEL0
Handle: bk_3229_1_886451722 Media:
SPFILE Included: Modification time: 10-JUL-15

BS Key Size Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
3179 83.75M SBT_TAPE 00:00:57 30-JUL-15
BP Key: 3139 Status: AVAILABLE Compressed: NO Tag: TAG20150730T203744
Handle: al_3230_1_886451865 Media:

List of Archived Logs in backup set 3179
Thrd Seq Low SCN Low Time Next SCN Next Time
---- ------- ---------- --------- ---------- ---------
1 4005 12030094721658 30-JUL-15 12030095358801 30-JUL-15
1 4006 12030095358801 30-JUL-15 12030095373861 30-JUL-15

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