This CV0-004 practice question tests your understanding of deployment. 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 is deploying a cloud-based application that requires consistent, low-latency access to shared database files. Which storage option should be used for the database files?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block storage volumes attached to the database server
Block storage volumes (e.g., Amazon EBS or Azure Managed Disks) provide consistent, low-latency I/O performance because they are directly attached to the database server via a high-speed network and support protocols like NVMe or SCSI. This allows the database to perform synchronous writes and reads with minimal jitter, which is critical for transactional workloads that require ACID compliance. Unlike shared file systems or object storage, block storage offers the raw disk-level access that database engines (e.g., MySQL, PostgreSQL, SQL Server) expect for their data and log files.
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.
✓
Block storage volumes attached to the database server
Why this is correct
Block storage offers high performance and low latency for random I/O, making it ideal for databases.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network file system (NFS) mount
Why it's wrong here
NFS adds network latency and may not provide the consistent low-latency access required for databases.
✗
Object storage (e.g., Amazon S3)
Why it's wrong here
Object storage has higher latency and is not designed for transactional database workloads.
✗
Ephemeral instance storage
Why it's wrong here
Ephemeral storage is temporary and data is lost upon instance stop/termination, not suitable for persistent database files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that NFS is suitable for database workloads because it provides shared access, but the trap is that NFS lacks the low-latency, synchronous write guarantees required for transactional databases, and candidates overlook the performance penalties of network file locking and cache coherency protocols.
Detailed technical explanation
How to think about this question
Block storage volumes are presented as raw devices that the database server can format with a filesystem (e.g., ext4, XFS) or use directly as raw partitions for Oracle ASM or SQL Server. Under the hood, modern cloud block storage uses distributed storage fabrics (e.g., AWS Nitro, Azure Hyper-V) that replicate data across multiple physical hosts to ensure durability while maintaining sub-millisecond latency through dedicated network paths. In a real-world scenario, a database administrator might configure multiple EBS volumes in a RAID 0 stripe to maximize throughput for a high-transaction OLTP workload, which is not possible with NFS or object storage.
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 practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Block storage volumes attached to the database server — Block storage volumes (e.g., Amazon EBS or Azure Managed Disks) provide consistent, low-latency I/O performance because they are directly attached to the database server via a high-speed network and support protocols like NVMe or SCSI. This allows the database to perform synchronous writes and reads with minimal jitter, which is critical for transactional workloads that require ACID compliance. Unlike shared file systems or object storage, block storage offers the raw disk-level access that database engines (e.g., MySQL, PostgreSQL, SQL Server) expect for their data and log files.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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