Quick Answer
The answer is an Azure Log Analytics workspace because it is the only Azure service that combines long-term retention with native queryability for compliance and analysis. Azure Log Analytics workspaces, part of Azure Monitor, can ingest logs from multiple Azure services and support extended retention up to seven years, while allowing interactive analysis using Kusto Query Language (KQL). On the AZ-305 exam, this question tests your ability to distinguish between storage services optimized for different workloads—a common trap is choosing Azure Blob Storage for cost reasons, but Blob Storage lacks built-in query capabilities for log analysis. Remember that for compliance-driven log retention where you need to run queries, Log Analytics is the correct choice, not a cheaper storage-only option. A useful memory tip is “Logs need Logs”—Log Analytics for logs, Blob for blobs.
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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.
You need to design a solution to store log data from multiple Azure services. The data must be retained for 7 years for compliance purposes and should be queryable for analysis. Which Azure service should you use as the primary storage for these logs?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Azure Data Lake Storage
Why wrong: Data Lake is for analytics, not log management.
Azure SQL Database
Why wrong: SQL Database is not cost-effective for high-volume log storage.
Azure Blob Storage
Why wrong: Blob Storage can archive logs but is not query-friendly without additional tools.
Azure Log Analytics workspace
Log Analytics provides long-term retention and powerful KQL querying.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Log Analytics workspace
Option B is correct because Azure Log Analytics workspaces (part of Azure Monitor) can ingest logs from multiple services, retain data for up to 7 years (with extended retention), and support KQL queries. Option A (Azure Blob Storage) can store logs but is not optimized for interactive querying. Option C (Azure Data Lake Storage) is for big data analytics, not primarily for logs. Option D (Azure SQL Database) is not designed for high-volume log ingestion and may be costly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure Data Lake Storage
Why it's wrong here
Data Lake is for analytics, not log management.
Azure SQL Database
Why it's wrong here
SQL Database is not cost-effective for high-volume log storage.
Azure Blob Storage
Why it's wrong here
Blob Storage can archive logs but is not query-friendly without additional tools.
Azure Log Analytics workspace
Why this is correct
Log Analytics provides long-term retention and powerful KQL querying.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Log Analytics workspace — Option B is correct because Azure Log Analytics workspaces (part of Azure Monitor) can ingest logs from multiple services, retain data for up to 7 years (with extended retention), and support KQL queries. Option A (Azure Blob Storage) can store logs but is not optimized for interactive querying. Option C (Azure Data Lake Storage) is for big data analytics, not primarily for logs. Option D (Azure SQL Database) is not designed for high-volume log ingestion and may be costly.
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This AZ-305 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-305 exam.
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