146.You want to take the backup of the USERS tablespace. It has a single data file of 900 MB. You have tape drives of 300 MB each. The SBT channel is configured for the RMAN. To accomplish the backup, you issued the following RMAN command:
RMAN> BACKUP SECTION SIZE 300M TABLESPACE users;
Which two statements are true regarding the execution of the above command? (Choose two.)
A. The RMAN parallelizes the backup although the parallelism is not set for a channel.
B. The backup piece size will be limited to 300 MB.
C. The operation is accomplished using the default channel available.
D. Three channels for the tape drive must be configured by setting the parallelism to three.
Answer: BC
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF
A错误，如果没有设置并行度，那么备份时只能使用默认的CONFIGURE里面配置的并行度执行，但是默认并行度为1，即只能通过一个通道来备份，并不是并行备份的。
B正确，指定每个备份的大小为300M，所以每个备份片被限制为300M。
C正确，使用默认的可用的通道来完成备份。
D错误，不是一定，只是多配置几个通道，速度会更快点，但不一定要配置3个，使用默认的一个通道也是可以备份的。
RMAN> BACKUP SECTION SIZE 300M TABLESPACE users;
Which two statements are true regarding the execution of the above command? (Choose two.)
A. The RMAN parallelizes the backup although the parallelism is not set for a channel.
B. The backup piece size will be limited to 300 MB.
C. The operation is accomplished using the default channel available.
D. Three channels for the tape drive must be configured by setting the parallelism to three.
Answer: BC
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF
A错误，如果没有设置并行度，那么备份时只能使用默认的CONFIGURE里面配置的并行度执行，但是默认并行度为1，即只能通过一个通道来备份，并不是并行备份的。
B正确，指定每个备份的大小为300M，所以每个备份片被限制为300M。
C正确，使用默认的可用的通道来完成备份。
D错误，不是一定，只是多配置几个通道，速度会更快点，但不一定要配置3个，使用默认的一个通道也是可以备份的。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2120896/ ，如需转载，请注明出处，否则将追究法律责任。
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