053-146

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.

　　相关题 134
　　通过设置 section size ，RMAN 可以对一个数据文件进行复合备份（不能进行拷贝）。主要是在单个大数据文件时，RMAN 通道可以并行的进行备份，每个通道生成多段备份集中的一个。最多只能生成 256 个文件，和选择的大小有关。其参数可以和 MAXPICESIZE 或 INCREMENTAL LEVEL 1 选项一起使用
A,错误，没有设置并行度和通道，那么会使用默认的通道，c 对，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
D,错误，并不一定要设置并行度为 3，不设置并行度也是可以进行备份的。