DEA-C01 Data Operations and Support Practice Question
A data engineer is troubleshooting a nightly AWS Glue ETL job that reads from an Amazon RDS for MySQL table and writes to an Amazon S3 bucket in Parquet format. The job runs successfully most days, but occasionally fails with the error 'ERROR: An error occurred while calling o67.pyWriteDynamicFrame. The transaction log for the database is full due to 'LOG_BACKUP'.' What is the MOST likely cause of this error?
⚠ Common exam trap
Many exam-takers confuse a database-side resource exhaustion error (transaction log full) with a permissions or configuration issue in AWS Glue, leading them to incorrectly select options related to Glue permissions or method syntax.
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
✓
The MySQL database transaction log needs to be backed up to free space.
The error message 'The transaction log for the database is full due to 'LOG_BACKUP'' indicates that the MySQL database's transaction log has reached its maximum size because it has not been backed up and truncated. In MySQL, the transaction log (often the InnoDB redo log or binary log) must be backed up periodically to free space; otherwise, write operations fail. This is a database-side issue, not a Glue or permissions problem, so the correct action is to back up the transaction log to release space.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The MySQL database has reached its maximum number of concurrent connections.
Why it's wrong here
The error message specifically mentions transaction log, not connection limits.
- ✗
The AWS Glue job does not have sufficient permissions to write to the S3 bucket.
Why it's wrong here
The error is about the source database transaction log, not S3 write permissions.
- ✗
The AWS Glue job is configured with an incorrect 'writeDynamicFrame' method.
Why it's wrong here
The error is not related to the method call but to the source database condition.
- ✓
The MySQL database transaction log needs to be backed up to free space.
Why this is correct
The error 'LOG_BACKUP' indicates that the transaction log is full and requires a backup to truncate it.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
Related to this question
About these practice questions
One of 1,711 original DEA-C01 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.