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| Section | Weight | Objectives |
|---|---|---|
| Data Store Management | 26% | - Understand data cataloging
|
| Data Operations and Support | 22% | - Automate data pipelines
|
| Data Security and Governance | 18% | - Implement data quality checks
|
| Data Ingestion and Transformation | 34% | - Apply programming concepts
|
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NEW QUESTION # 287
A data engineer is configuring an AWS Glue Apache Spark extract, transform, and load (ETL) job. The job contains a sort-merge join of two large and equally sized DataFrames.
The job is failing with the following error: No space left on device.
Which solution will resolve the error?
Answer: A
Explanation:
A sort-merge join generates large shuffle files, leading to "No space left on device" errors when both datasets are large. Using a broadcast join sends a smaller dataset to all executors, avoiding shuffle and disk I/O overhead.
"Broadcast joins reduce shuffle I/O by distributing the smaller dataset to all worker nodes, mitigating disk space and shuffle errors."
- Ace the AWS Certified Data Engineer - Associate Certification - version 2 - apple.pdf This is the most cost-effective and direct fix for large shuffle-stage failures.
NEW QUESTION # 288
Files from multiple data sources arrive in an Amazon S3 bucket on a regular basis. A data engineer wants to ingest new files into Amazon Redshift in near real time when the new files arrive in the S3 bucket.
Which solution will meet these requirements?
Answer: A
Explanation:
For near real-time processing of new files in S3,event-driven ingestionis optimal. S3 Event Notifications can triggerAWS Lambdato immediately load data into Amazon Redshift, eliminating latency associated with batch scheduling.
"Event-based triggers using S3 notifications and Lambda functions are effective for near real-time ingestion pipelines into Amazon Redshift."
-Ace the AWS Certified Data Engineer - Associate Certification - version 2 - apple.pdf Option C (Glue bookmarks) is best for batch jobs, and zero-ETL applies toAurora to Redshift, not S3.
NEW QUESTION # 289
A company uses Amazon Redshift as its data warehouse. Data encoding is applied to the existing tables of the data warehouse. A data engineer discovers that the compression encoding applied to some of the tables is not the best fit for the data. The data engineer needs to improve the data encoding for the tables that have sub- optimal encoding.
Which solution will meet this requirement?
Answer: B
Explanation:
Option B is correct because ANALYZE COMPRESSION is the Amazon Redshift command specifically used to evaluate existing table data and recommend better compression encodings for columns. AWS states that ANALYZE COMPRESSION performs compression analysis and produces a report with the suggested compression encoding for the tables analyzed. AWS also states that when you already have data in an existing table, you can use ANALYZE COMPRESSION to view the recommended encodings for that table.
Option A is incorrect because the standard ANALYZE command updates optimizer statistics; it does not recommend column compression settings. Options C and D are vacuum operations related to sorting, reclaiming space, or clustering behavior, not choosing better compression encodings. AWS also notes that Redshift supports automatic encoding management with ENCODE AUTO, but when the question asks how to improve encoding for existing suboptimal tables, the direct diagnostic command is ANALYZE COMPRESSION.
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NEW QUESTION # 290
A company uses an Amazon Redshift cluster that runs on RA3 nodes. The company wants to scale read and write capacity to meet demand. A data engineer needs to identify a solution that will turn on concurrency scaling.
Which solution will meet this requirement?
Answer: C
Explanation:
Concurrency scaling is a feature that allows you to support thousands of concurrent users and queries, with consistently fast query performance. When you turn on concurrency scaling, Amazon Redshift automatically adds query processing power in seconds to process queries without any delays. You can manage which queries are sent to the concurrency-scaling cluster by configuring WLM queues. To turn on concurrency scaling for a queue, set the Concurrency Scaling mode value to auto. The other options are either incorrect or irrelevant, as they do not enable concurrency scaling for the existing Redshift cluster on RA3 nodes. Reference:
Working with concurrency scaling - Amazon Redshift
Amazon Redshift Concurrency Scaling - Amazon Web Services
Configuring concurrency scaling queues - Amazon Redshift
AWS Certified Data Engineer - Associate DEA-C01 Complete Study Guide (Chapter 6, page 163)
NEW QUESTION # 291
A company uses Amazon RDS for MySQL as the database for a critical application. The database workload is mostly writes, with a small number of reads.
A data engineer notices that the CPU utilization of the DB instance is very high. The high CPU utilization is slowing down the application. The data engineer must reduce the CPU utilization of the DB Instance.
Which actions should the data engineer take to meet this requirement? (Choose two.)
Answer: B,D
Explanation:
Amazon RDS is a fully managed service that provides relational databases in the cloud. Amazon RDS for MySQL is one of the supported database engines that you can use to run your applications. Amazon RDS provides various features and tools to monitor and optimize the performance of your DB instances, such as Performance Insights, Enhanced Monitoring, CloudWatch metrics and alarms, etc.
Using the Performance Insights feature of Amazon RDS to identify queries that have high CPU utilization and optimizing the problematic queries will help reduce the CPU utilization of the DB instance. Performance Insights is a feature that allows you to analyze the load on your DB instance and determine what is causing performance issues. Performance Insights collects, analyzes, and displays database performance data using an interactive dashboard. You can use Performance Insights to identify the top SQL statements, hosts, users, or processes that are consuming the most CPU resources. You can also drill down into the details of each query and see the execution plan, wait events, locks, etc. By using Performance Insights, you can pinpoint the root cause of the high CPU utilization and optimize the queries accordingly. For example, you can rewrite the queries to make them more efficient, add or remove indexes, use prepared statements, etc.
Implementing caching to reduce the database query load will also help reduce the CPU utilization of the DB instance. Caching is a technique that allows you to store frequently accessed data in a fast and scalable storage layer, such as Amazon ElastiCache. By using caching, you can reduce the number of requests that hit your database, which in turn reduces the CPU load on your DB instance. Caching also improves the performance and availability of your application, as it reduces the latency and increases the throughput of your data access. You can use caching for various scenarios, such as storing session data, user preferences, application configuration, etc. You can also use caching for read-heavy workloads, such as displaying product details, recommendations, reviews, etc.
The other options are not as effective as using Performance Insights and caching. Modifying the database schema to include additional tables and indexes may or may not improve the CPU utilization, depending on the nature of the workload and the queries. Adding more tables and indexes may increase the complexity and overhead of the database, which may negatively affect the performance. Rebooting the RDS DB instance once each week will not reduce the CPU utilization, as it will not address the underlying cause of the high CPU load. Rebooting may also cause downtime and disruption to your application. Upgrading to a larger instance size may reduce the CPU utilization, but it will also increase the cost and complexity of your solution. Upgrading may also not be necessary if you can optimize the queries and reduce the database load by using caching. Reference:
Amazon RDS
Performance Insights
Amazon ElastiCache
[AWS Certified Data Engineer - Associate DEA-C01 Complete Study Guide], Chapter 3: Data Storage and Management, Section 3.1: Amazon RDS
NEW QUESTION # 292
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