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Question 104 - DP-300 discussion

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You have an Always On availability group deployed to Azure virtual machines. The availability group contains a database named DB1 and has two nodes named SQL1 and SQL2. SQL1 is the primary replica. You need to initiate a full backup of DB1 on SQL2.

Which statement should you run?

A.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (Differential, STATS=5, COMPRESSION);
Answers
A.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (Differential, STATS=5, COMPRESSION);
B.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (COPY_ONLY, STATS=5, COMPRESSION);
Answers
B.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (COPY_ONLY, STATS=5, COMPRESSION);
C.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (File_Snapshot, STATS=5, COMPRESSION);
Answers
C.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (File_Snapshot, STATS=5, COMPRESSION);
D.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (NoInit, STATS=5, COMPRESSION);
Answers
D.
BACKUP DATABASE DB1 TO URL='https://mystorageaccount.blob.core.windows.net/mycontainer/DB1.bak' with (NoInit, STATS=5, COMPRESSION);
Suggested answer: B

Explanation:

BACKUP DATABASE supports only copy-only full backups of databases, files, or filegroups when it's executed on secondary replicas. Copy-only backups don't impact the log chain or clear the differential bitmap. Incorrect Answers:

A: Differential backups are not supported on secondary replicas. The software displays this error because the secondary replicas support copy-only database backups.

Reference: https://docs.microsoft.com/en-us/sql/database-engine/availability-groups/windows/active-secondaries-backup-on-secondary-replicas-always-on-availability-groups

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asked 02/10/2024
Massimo Cerqui
38 questions
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