Which two are true about RMAN Multisection backups when a very large data file is divided into four sections? (Choose two.)
Which two are true about RMAN Multisection backups when a very large data file is divided into four sections? (Choose two.)
In RMAN multisection backups, a very large data file divided into multiple sections allows each section to be processed independently. The sections can be created either serially or in parallel, depending on the number of allocated channels. This flexibility in processing ensures efficient and faster backups of large data files by distributing the workload. Therefore, the two true statements about RMAN multisection backups are that the sections can be created serially and they can be created in parallel.
B, D Depending on number of allocated channels (can be created serially/parallel). Starting with Oracle Database 12c Release 1 (12.1), you can create multisection full backups that are stored as image copies. e.g. backup as copy database section size 500m;
I recheck and agree with you.
https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/backing-up-database-advanced.html#GUID-F2D9FF2D-9E1C-4D38-AD8E-88B6B32F02B4 If you specify the SECTION SIZE parameter on the BACKUP command, then RMAN creates a backup set in which each backup piece contains the blocks from one file section. The option E mentions backup "sets" (more than one backup set), making the option wrong.
DE If you specify the SECTION SIZE parameter on the BACKUP command, then RMAN can create a multisection backup. In this case, a single backup set can contain multiple backup pieces, each containing a file section. The purpose
D,E is the correct answer. The question is simply about RMAN Multisection backups and as per oracle docs "The purpose of multisection backups is to enable RMAN channels to back up a single large file in parallel." https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/backing-up-database-advanced.html#GUID-F2D9FF2D-9E1C-4D38-AD8E-88B6B32F02B4 Therefore this question should be answered assuming all the pre-requisties are already in place for multisection backups (eg SECTION SIZE parameter, enough channels allocated for parallelism)
I think DE is correct because as the documentation says (https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/backing-up-database-advanced.html#GUID-BC32C333-F0EB-4F17-AD79-8882E224D2F4) "If a multisection backup completes successfully, then no backup set generated during the backup contains a partial data file", so the conclusion is all four sections must be contained in backup set (E)
Reading at your link: To make a multisection backup: Start RMAN and connect to a target database and recovery catalog (if used). If necessary, configure channel parallelism so that RMAN can make the backup parallel.
B, D : https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/glossary.html#GUID-44B5A820-D859-47F5-99CC-56A95AF4BB3E You create a multisection backup by specifying the SECTION SIZE parameter on the BACKUP command. An RMAN channel can process each file section independently, either serially or in parallel. Thus, in a multisection backup, multiple channels can back up a single file.
DE correct
Update: mporislav is right. B,D correct
Thus, DE are my answers The purpose of multisection backups is to enable RMAN channels to back up a single large file in parallel. RMAN divides the work among multiple channels, with each channel backing up one file section in a file.
here is the link https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/backing-up-database-advanced.html#GUID-F2D9FF2D-9E1C-4D38-AD8E-88B6B32F02B4
DE i think
BD , my mistake, sorry
B,D https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/backing-up-database-advanced.html#GUID-F2D9FF2D-9E1C-4D38-AD8E-88B6B32F02B4
DE https://docs.oracle.com/cd/E25054_01/backup.1111/e10642/rcmbckad.htm#:~:text=The%20purpose%20of%20multisection%20backups,of%20backups%20of%20large%20datafiles.
I agree with mporislav