Oracle OCP 1Z0 053 Q587(Backup as compressed backupset)
587.Compressed backups work with which of the following commands?
A. copy as backup
B. backup as copy
C. backup
D. copy
Answer: C
image copy不能压缩。
Full database backups should usually be either image copies or compressed backup sets. Image copies are more flexible than backup sets for some purposes (such as use in an incrementally updated backups strategy), and compressed backup sets make more efficient use of storage space, if the CPU overhead involved in creating them is tolerable.
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF107
备份数据库（IMAGE COPY）：backup database as copy;
压缩备份：backup database as compressed backupset;
A. copy as backup
B. backup as copy
C. backup
D. copy
Answer: C
image copy不能压缩。
Full database backups should usually be either image copies or compressed backup sets. Image copies are more flexible than backup sets for some purposes (such as use in an incrementally updated backups strategy), and compressed backup sets make more efficient use of storage space, if the CPU overhead involved in creating them is tolerable.
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF107
备份数据库（IMAGE COPY）：backup database as copy;
压缩备份：backup database as compressed backupset;
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