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.
Explanation:
SECTION SIZE sizeSpec Specifies the size of each backup section produced during a data
file backup.
By setting this parameter, RMAN can create a multisection backup. In a multisection backup,
RMAN creates a backup piece that contains one file section, which is a contiguous range of
blocks in a file. All sections of a multisection backup are the same size. You can create a
multisection backup for a data file, but not a data file copy.
File sections enable RMAN to create multiple steps for the backup of a single large data file.
RMAN channels can process each step independently and in parallel, with each channel
producing one section of a multisection backup set.
If you specify a section size that is larger than the size of the file, then RMAN does not use
multisection backup for the file. If you specify a small section size that would produce more
than 256 sections, then RMAN increases the section size to a value that results in exactly
256 sections.
Depending on where you specify this parameter in the RMAN syntax, you can specify
different section sizes for different files in the same backup job.
Note: You cannot use SECTION SIZE with MAXPIECESIZE or with INCREMENTAL LEVEL
1.