You administer a Microsoft SQL Server 2012 server that hosts a transactional database and a
reporting database. The transactional database is updated through a web application and is
operational throughout the day. The reporting database is only updated from the transactional
database.
The recovery model and backup schedule are configured as shown in the following table:
At 14:00 hours, you discover that pages 71, 520, and 713 on one of the database files are corrupted
on the reporting database.
You also need to ensure that data loss is minimal.
What should you do?
A.
Perform a partial restore.
B.
Restore the latest full backup, and restore the latest differential backup. Then, restore each log
backup taken before the time of failure from the most recent differential backup.
C.
Restore the latest full backup.
D.
Restore the latest full backup, and restore the latest differential backup. Then, restore the latest
log backup.
E.
Perform a page restore.
F.
Restore the latest full backup. Then, restore each differential backup taken before the time of
failure from the most recent full backup.
G.
Perform a point-in-time restore.
H.
Restore the latest full backup. Then, restore the latest differential backup.
Explanation:
Restores a file or filegroup in a multi-filegroup database. Note that under the simple recovery model,
the file must belong to a read-only filegroup. After a full file restore, a differential file backup can be
restored.
Page restore
Restores individual pages. Page restore is available only under the full and bulk-logged recovery
models
Piecemeal restore
Restores the database in stages, beginning with the primary filegroup and one or more secondary
filegroups. A piecemeal restore begins with a RESTORE DATABASE using the PARTIAL option and
specifying one or more secondary filegroups to be restored
The most recent backup taken was the Differential Backup at 13:00, which is linked to the Full Backup taken at 01:00. So the answer is (H), first restore the last Full Backup, followed by the last Differential Backup.
H is clear, but let’s unpack “each differential backup taken before the time of
failure from the most recent full backup”. Normally you make a backup “of” something, not “from” something, but “from” can imply the word “after”, albeit awkwardly. I will diet starting from after New Year’s. Restore the differential backup (taken before the time of the failure) from [after] the most recent full backup. It sounds like that 14:00 differential that H refers to. A direct interpretation makes no sense. How do you take a differential backup from a full backup? You would restore a backup from a disk or drive. If its’ the differential backup that occurs after the last full backup, h and f are the same. It’s just really poor English designed to trick people who don’t live in America.
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