You are managing an Oracle Database 11g database. You want to take the backup of MULT_DATA, a big file
tablespace of size 100 TB on tape drive, but you have tapedrives of only 10 GB each.
Which method would accomplish the task quickly and efficiently?
A.
parallel image copy backup
B.
backup with MAXPIECESIZE configured for the channel
C.
parallel backup with MAXPIECESIZE configured for the channel
D.
intrafile parallel backup
Explanation:
The MAXPIECESIZE option is to limit the size of backup piece. not to split the big file into pieces.
Configuring the Maximum Size of Backup Pieces
Backup piece size is an issue when it exceeds the maximum file size permitted by the file system or media
management software. You can use the MAXPIECESIZE parameter of the CONFIGURE CHANNEL or
ALLOCATE CHANNEL command to limit the size of backup pieces.
For example, to limit the backup piece size to 2 gigabytes or less, you can configure the automatic DISK
channel as follows and then run BACKUP DATABASE:
CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 2G;
BACKUP DATABASE;
We should use the SECTION SIZE option to split the big file into sections to the multiple backup devices.
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.