The correct answer is to use an online index rebuild with resumable operation. This strategy is optimal because it allows the index to be rebuilt while the table remains fully available for both reads and writes, directly addressing the performance degradation from fragmentation without causing blocking or downtime. The resumable feature is particularly critical for large, frequently updated tables in Azure SQL Database, as it lets you pause and later resume the rebuild if it is interrupted by a failover or resource pressure, ensuring the maintenance completes without restarting from scratch. On the DP-300 exam, this scenario tests your understanding of balancing index maintenance with high availability, often appearing in questions about minimizing impact on production workloads. A common trap is choosing an offline rebuild, which locks the table, or a non-resumable online rebuild, which fails entirely if interrupted. Remember the mnemonic “ORR” for Online, Resumable, Resilient—the three pillars of safe index maintenance in Azure SQL Database.
DP-300 Plan and implement data platform resources Practice Question
This DP-300 practice question tests your understanding of plan and implement data platform resources. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has an Azure SQL Database with a large table that is frequently updated. They notice performance degradation due to index fragmentation. Which maintenance strategy should you recommend to minimize impact on availability and performance?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use online index rebuild with resumable operation.
Option B is correct because online index rebuild with resumable operation allows the index to be rebuilt while the table remains available for reads and writes, minimizing downtime. The resumable feature lets you pause and resume the rebuild if it is interrupted, which is critical for large tables that are frequently updated. This approach reduces performance impact compared to offline rebuilds and avoids blocking issues associated with other online methods.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Schedule an offline index rebuild during off-peak hours.
Why it's wrong here
Offline rebuild locks the table, causing downtime.
✓
Use online index rebuild with resumable operation.
Why this is correct
Online rebuild allows concurrent access and resumable in case of failure, minimizing impact.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable and rebuild indexes manually during maintenance window.
Why it's wrong here
Disabling indexes degrades performance and is not a standard maintenance practice.
✗
Use online index reorganize with low priority locks.
Why it's wrong here
Reorganize is less effective for high fragmentation and may not fully resolve it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'online index reorganize' (which is less impactful but insufficient for high fragmentation) with 'online index rebuild' (which is the correct solution for severe fragmentation), or they assume offline operations are acceptable despite the availability requirement.
Detailed technical explanation
How to think about this question
Online index rebuild in Azure SQL Database uses the database engine's ability to create a new index structure while the old index remains available for queries and modifications, using row versioning to handle concurrent transactions. The resumable operation (introduced in SQL Server 2017 and available in Azure SQL Database) writes checkpoints to the transaction log, allowing the rebuild to be paused and resumed without restarting from scratch—critical for large tables where a single rebuild might exceed maintenance windows. Under the hood, the rebuild uses a SORT operator and allocates new pages, while the old index is only dropped after the new one is fully built and transactionally consistent.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Plan and implement data platform resources — This question tests Plan and implement data platform resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use online index rebuild with resumable operation. — Option B is correct because online index rebuild with resumable operation allows the index to be rebuilt while the table remains available for reads and writes, minimizing downtime. The resumable feature lets you pause and resume the rebuild if it is interrupted, which is critical for large tables that are frequently updated. This approach reduces performance impact compared to offline rebuilds and avoids blocking issues associated with other online methods.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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