The answer is to set the DEADLOCK_PRIORITY to LOW on the blocking session and set LOCK_TIMEOUT to 5000. This configuration works because LOCK_TIMEOUT specifies the maximum milliseconds a session will wait for a lock to be released, and when combined with a low deadlock priority, the blocking session becomes the preferred victim if it exceeds that 5-second threshold, effectively terminating it automatically. On the DP-300 exam, this scenario tests your understanding of how to handle high blocking in Azure SQL Managed Instance without application changes, often appearing as a trap where candidates confuse snapshot isolation or resource governor with timeout-based termination. A common mistake is thinking READ COMMITTED SNAPSHOT kills blockers, but it only avoids blocking by using row versioning. Remember the mnemonic: “Low priority, short wait — the blocker meets its fate.”
DP-300 Practice Question: Monitor, configure, and optimize database resources
This DP-300 practice question tests your understanding of monitor, configure, and optimize database resources. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 are a database administrator for an e-commerce company that uses Azure SQL Managed Instance. You have a database that experiences high blocking due to long-running transactions. You need to configure a solution that automatically terminates the blocking process after it has been waiting for more than 5 seconds. The solution should be set at the database level and should not require any application changes. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the DEADLOCK_PRIORITY to LOW on the blocking session and set LOCK_TIMEOUT to 5000.
Option A is correct because setting the DEADLOCK_PRIORITY to LOW and using a lock timeout of 5 seconds will cause the blocking session to be killed if it exceeds the timeout. Option B is wrong because resource governor is not available in Managed Instance at the database level. Option C is wrong because read committed snapshot isolation does not kill blocking processes. Option D is wrong because changing transaction isolation level does not automatically terminate processes.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable read committed snapshot isolation (RCSI) on the database.
Why it's wrong here
RCSI reduces blocking but does not kill blocking processes.
✗
Create a resource governor workload group with a maximum grant time of 5 seconds.
Why it's wrong here
Resource governor is not supported in Azure SQL Managed Instance.
✓
Set the DEADLOCK_PRIORITY to LOW on the blocking session and set LOCK_TIMEOUT to 5000.
Why this is correct
This combination causes the session to be killed if it cannot acquire a lock within 5 seconds.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set the transaction isolation level to SNAPSHOT for all sessions.
Why it's wrong here
Snapshot isolation does not automatically terminate long-running transactions.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the DEADLOCK_PRIORITY to LOW on the blocking session and set LOCK_TIMEOUT to 5000. — Option A is correct because setting the DEADLOCK_PRIORITY to LOW and using a lock timeout of 5 seconds will cause the blocking session to be killed if it exceeds the timeout. Option B is wrong because resource governor is not available in Managed Instance at the database level. Option C is wrong because read committed snapshot isolation does not kill blocking processes. Option D is wrong because changing transaction isolation level does not automatically terminate processes.
What should I do if I get this DP-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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