1Z0-060 Question #102: Real Exam Question with Answer & Explanation

Question

Options

• ABackup change tracking will sometimes reduce I/O performed during cumulative incremental backups.
• BThe change tracking file must always be backed up when you perform a full database backup.
• CBlock change tracking will always reduce I/O performed during cumulative incremental backups.
• DMore than one database block may be read by an incremental backup for a change made to a single block.
• EThe incremental level 1 backup that immediately follows the enabling of block change tracking will not read

Explanation

A: In a cumulative level 1 backup, RMAN backs up all the blocks used since the most recent level 0 incremental backup. E: Oracle Block Change Tracking Once enabled; this new 10g feature records the modified since last backup and stores the log of it in a block change tracking file using the CTW (Change Tracking Writer) process. During backups RMAN uses the log file to identify the specific blocks that must be backed up. This improves RMAN's performance as it does not have to scan whole datafiles to detect changed blocks. Logging of changed blocks is performed by the CTRW process which is also responsible for writing data to the block change tracking file. * An incremental level 0 backup backs up all blocks that have ever been in use in this database.

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