DP-300 Practice Question: Monitor, configure, and optimize database resources
You are troubleshooting a transaction log growth issue on an Azure SQL Database. Which THREE conditions can cause the transaction log to grow unexpectedly?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Replication that has not delivered transactions to the subscriber
Options A, C, and D are correct. A long-running uncommitted transaction (C) prevents log truncation, causing growth. Replication with undelivered transactions (A) holds log space until delivery completes. Excessive updates due to a missing index (D) generate many log records, increasing log size. Option B is incorrect because memory-optimized tables use a different logging mechanism (e.g., native redo) that does not inherently cause more log growth than disk-based tables. Option E is incorrect because page compression reduces the size of data pages, which can decrease log record size for changes, not cause growth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Replication that has not delivered transactions to the subscriber
Why this is correct
Log space held for replication.
- ✗
A memory-optimized table with a large number of rows
Why it's wrong here
Memory-optimized tables log differently but not inherently more.
- ✓
A long-running transaction that has not been committed
Why this is correct
Prevents log truncation.
- ✓
A missing index on a large table that causes excessive updates
Why this is correct
Large updates generate many log records.
- ✗
Page compression enabled on tables
Why it's wrong here
Compression reduces log size.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
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