DBS-C01 Monitoring and Troubleshooting Practice Question
Exhibit
Refer to the exhibit. ``` # CloudWatch Logs log group: /aws/rds/cluster/mycluster/error # Log stream: production-2024-05-01 2024-05-01T10:00:00Z [ERROR] [MY-000001] [Server] Table 'mydb.temp_data' is marked as crashed and should be repaired 2024-05-01T10:01:00Z [ERROR] [MY-000002] [InnoDB] Database page corruption on disk or a failed file read of page ```
Refer to the exhibit. A DBA sees the above log entries for an Amazon Aurora MySQL cluster. What is the most likely cause?
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
✓
There is underlying storage corruption
The logs show page corruption and checksum errors, which are classic symptoms of underlying storage corruption in Aurora MySQL. Storage corruption can occur due to hardware failures or software bugs, and Aurora's distributed storage layer can sometimes experience such issues that manifest as corrupted pages. Option B is incorrect because reader lag would show replication delay metrics and possibly 'seconds behind master' warnings, not corruption-related errors. Option C is incorrect because connection exhaustion would generate errors like 'too many connections' or timeouts, not page corruption. Option D is incorrect because a failed backup restore would typically result in errors during the restore process, not ongoing page corruption after the instance is running.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
There is underlying storage corruption
Why this is correct
Page corruption errors indicate storage issues.
- ✗
The reader instance is lagging behind the writer
Why it's wrong here
Replication lag does not cause corruption.
- ✗
The DB instance has run out of connections
Why it's wrong here
Errors indicate corruption, not connection limits.
- ✗
A recent backup restore operation failed
Why it's wrong here
Backup restore would not cause corruption.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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