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Question 68/168
A data engineer is writing a query to join two tables in Amazon Athena. The data engineer needs to choose the correct join order for the tables to optimize query performance. Which solution will meet these requirements?
Correct Answer: A
Amazon Athena (based on Presto/Trino) performs joins more efficiently when the smaller table is placed on the left side because it is used as the build side of the join and can be loaded into memory. This minimizes data shuffling and improves performance when joining with a larger table on the right side.
- Question List (168q)
- Question 1: A company needs a solution that restricts access to Amazon S...
- Question 2: A data engineer develops an AWS Glue Apache Spark ETL job to...
- Question 3: A university is developing an educational application that a...
- Question 4: A data engineer at a large company needs to create centraliz...
- Question 5: A company is creating a new data pipeline to populate a data...
- Question 6: A company is developing a log streaming pipeline that uses A...
- Question 7: A company needs to collect logs for an Amazon RDS for MySQL ...
- Question 8: A company stores server logs in an Amazon S3 bucket. The com...
- Question 9: A retail company uses AWS Glue for extract, transform, and l...
- Question 10: A car sales company maintains data about cars that are liste...
- Question 11: Two developers are working on separate application releases....
- Question 12: A company maintains an Amazon Redshift provisioned cluster t...
- Question 13: A media company uses software as a service (SaaS) applicatio...
- Question 14: A technology company currently uses Amazon Kinesis Data Stre...
- Question 15: An investment company needs to manage and extract insights f...
- Question 16: A company is building a data lake for a new analytics team. ...
- Question 17: A company loads transaction data for each day into Amazon Re...
- Question 18: A company has an application that uses a microservice archit...
- Question 19: A company has a production AWS account that runs company wor...
- Question 20: A company has a data processing pipeline that runs multiple ...
- Question 21: A data engineer notices slow query performance on a highly p...
- Question 22: A company needs to build a data lake in AWS. The company mus...
- Question 23: A company needs to implement real-time analytics for a retai...
- Question 24: A company needs a solution to store and query product data t...
- Question 25: A company is creating near real-time dashboards to visualize...
- Question 26: A manufacturing company wants to collect data from sensors. ...
- Question 27: A company needs to optimize storage costs for an Amazon S3 b...
- Question 28: A media company wants to improve a system that recommends me...
- Question 29: A global company currently uses Amazon Redshift to store dat...
- Question 30: A company uses AWS Key Management Service (AWS KMS) to encry...
- Question 31: You have been tasked with migrating an on-premises MySQL dat...
- Question 32: A company stores CSV files in an Amazon S3 bucket. A data en...
- Question 33: A company is using Amazon Redshift to build a data warehouse...
- Question 34: A retail company wants to implement real-time analytics for ...
- Question 35: A data engineer is configuring Amazon SageMaker Studio to us...
- Question 36: A company needs a solution to manage costs for an existing A...
- Question 37: A data engineer configured an AWS Glue Data Catalog for data...
- Question 38: A manufacturing company collects sensor data from its factor...
- Question 39: A data engineer maintains custom Python scripts that perform...
- Question 40: A data engineer needs to create an Amazon Athena table based...
- Question 41: A media company wants to use Amazon OpenSearch Service to an...
- Question 42: A retail company has a customer data hub in an Amazon S3 buc...
- Question 43: A retail company uses Amazon Aurora PostgreSQL to process an...
- Question 44: A data engineer runs Amazon Athena queries on data that is i...
- Question 45: A data engineer wants to orchestrate a set of extract, trans...
- Question 46: A company needs to build a data pipeline to process a 1-TB f...
- Question 47: A data engineer is using an AWS Glue ETL job to remove outda...
- Question 48: A company stores data in Amazon S3 and Amazon RDS. The compa...
- Question 49: A data engineer needs to schedule a workflow that runs a set...
- Question 50: A retail company is using an Amazon Redshift cluster to supp...
- Question 51: A data engineer uses AWS Lake Formation to manage access to ...
- Question 52: A company built a data lake and a data warehouse on AWS. The...
- Question 53: A retail company stores order information in an Amazon Auror...
- Question 54: A company stores sensitive transaction data in an Amazon S3 ...
- Question 55: A global ecommerce company processes customer transactions, ...
- Question 56: A data engineer is building a data pipeline on AWS by using ...
- Question 57: A company stores employee data in Amazon Resdshift. A table ...
- Question 58: A company has a data lake in Amazon S3. The company collects...
- Question 59: A company stores logs in an Amazon S3 bucket. When a data en...
- Question 60: A company hosts its applications on Amazon EC2 instances. Th...
- Question 61: A company is uploading log files from on-premises servers to...
- Question 62: A data engineer is building an automated extract, transform,...
- Question 63: A data engineer must ingest a source of structured data that...
- Question 64: A company uses Amazon RDS to store transactional data. The c...
- Question 65: A data engineer is building a data orchestration workflow. T...
- Question 66: A data engineer needs a fully automated solution to check fo...
- Question 67: A company has a data lake in Amazon S3. The company uses AWS...
- Question 68: A data engineer is writing a query to join two tables in Ama...
- Question 69: A company has used an Amazon Redshift table that is named Or...
- Question 70: A data engineer is troubleshooting an AWS Glue workflow that...
- Question 71: A company runs an Apache Spark application every night in an...
- Question 72: A global finance company needs to implement near real-time c...
- Question 73: A company uses AWS Glue ETL pipelines to process data. The c...
- Question 74: A company is developing an application that runs on Amazon E...
- Question 75: A data engineer needs to onboard a new data producer into AW...
- Question 76: A company stores sensitive data in an Amazon Redshift table....
- Question 77: In a data engineering pipeline, a company is using multiple ...
- Question 78: A company wants to combine data from multiple software as a ...
- Question 79: A company uploads .csv files to an Amazon S3 bucket. The com...
- Question 80: A telecommunications company collects network usage data thr...
- Question 81: A data engineer is using Amazon QuickSight to build a dashbo...
- Question 82: A data engineer must manage the ingestion of real-time strea...
- Question 83: A company is building data processing pipelines by using AWS...
- Question 84: A data engineer must orchestrate a series of Amazon Athena q...
- Question 85: A company uses Amazon S3 to store semi-structured data in a ...
- Question 86: A company stores petabytes of data in thousands of Amazon S3...
- Question 87: A company has an Amazon Redshift data warehouse that users a...
- Question 88: A company uses Amazon Redshift for its data warehouse. A dat...
- Question 89: A company wants to migrate data from an Amazon RDS for Postg...
- Question 90: A data engineer uses Amazon Redshift to run resource-intensi...
- Question 91: A data engineer maintains custom Python scripts that perform...
- Question 92: A data engineer uploads confidential documents to an Amazon ...
- Question 93: A company analyzes data in a data lake every quarter to perf...
- Question 94: A data engineer is building a data pipeline. A large data fi...
- Question 95: A retail company is expanding its operations globally. The c...
- Question 96: A data engineer is using an Apache Iceberg framework to buil...
- Question 97: A company uses Amazon S3 and AWS Glue Data Catalog to manage...
- Question 98: A data engineer needs to use AWS Step Functions to design an...
- Question 99: A company is developing machine learning (ML) models. A data...
- Question 100: In a data engineering pipeline, a company is using multiple ...
- Question 101: A hotel management company receives daily data files from ea...
- Question 102: A company is setting up a new Amazon SageMaker Unified Studi...
- Question 103: A company has a data pipeline that uses an Amazon RDS instan...
- Question 104: A data engineer must use AWS services to ingest a dataset in...
- Question 105: An online retailer uses multiple delivery partners to delive...
- Question 106: A media company uploads large video files to Amazon S3 for p...
- Question 107: A company uses an Amazon Redshift cluster as a data warehous...
- Question 108: A company stores details about transactions in an Amazon S3 ...
- Question 109: A company uses an organization in AWS Organizations to manag...
- Question 110: A company stores information about its subscribers in an Ama...
- Question 111: A company stores customer data tables that include customer ...
- Question 112: A company currently stores all of its data in Amazon S3 by u...
- Question 113: A retail company stores data from a product lifecycle manage...
- Question 114: A financial company recently added more features to its mobi...
- Question 115: A company needs to transform IoT sensor data in near real ti...
- Question 116: A company is planning to use a provisioned Amazon EMR cluste...
- Question 117: A company needs a solution to automatically ingest data from...
- Question 118: A marketing company uses Amazon S3 to store clickstream data...
- Question 119: The company stores a large volume of customer records in Ama...
- Question 120: A company extracts approximately 1 TB of data every day from...
- Question 121: A company aggregates high-frequency sensor telemetry into an...
- Question 122: A marketing company uses Amazon S3 to store marketing data. ...
- Question 123: A manufacturing company has many IoT devices in facilities a...
- Question 124: A retail company stores point-of-sale transaction data in an...
- Question 125: A company is using Amazon S3 to build a data lake. The compa...
- Question 126: A company wants to migrate a data warehouse from Teradata to...
- Question 127: A company wants to ingest streaming data into an Amazon Reds...
- Question 128: A marketing company collects clickstream data. The company s...
- Question 129: A data engineer must implement a data cataloging solution to...
- Question 130: A data engineer uses Amazon Managed Workflows for Apache Air...
- Question 131: A company needs to store and analyze a large amount of IoT s...
- Question 132: A data engineering team is using an Amazon Redshift data war...
- Question 133: A manufacturing company uses AWS Glue jobs to process IoT se...
- Question 134: A security company stores IoT data that is in JSON format in...
- Question 135: A data engineer is launching an Amazon EMR cluster. The data...
- Question 136: A company has an on-premises PostgreSQL database that contai...
- Question 137: A data engineer needs to securely transfer 5 TB of data from...
- Question 138: A company needs to generate a one-time performance report by...
- Question 139: A finance company receives data from third-party data provid...
- Question 140: A company wants to analyze sales records that the company st...
- Question 141: A company stores customer data in an Amazon S3 bucket. The c...
- Question 142: A company has a business intelligence platform on AWS. The c...
- Question 143: A company needs to optimize storage for an Amazon S3 bucket....
- Question 144: A company must retain specific data for 1 year. A data engin...
- Question 145: A data engineer is using an AWS Glue crawler to catalog data...
- Question 146: A data engineer finished testing an Amazon Redshift stored p...
- Question 147: A gaming company uses Amazon Kinesis Data Streams to collect...
- Question 148: A data engineer has a one-time task to read data from object...
- Question 149: A company implements a data mesh that has a central governan...
- Question 150: A data engineer needs to use Amazon Neptune to develop graph...
- Question 151: A company uses Amazon EMR as an extract, transform, and load...
- Question 152: A data engineer needs to optimize the performance of a data ...
- Question 153: An ecommerce company collects daily customer transaction log...
- Question 154: A company processes 500 GB of audience and advertising data ...
- Question 155: A retail company uses an Amazon Redshift data warehouse and ...
- Question 156: A gaming company uses a NoSQL database to store customer inf...
- Question 157: A data engineer needs to deploy a complex pipeline. The stag...
- Question 158: An ecommerce company operates a complex order fulfilment pro...
- Question 159: A data engineer must build an extract, transform, and load (...
- Question 160: A lab uses IoT sensors to monitor humidity, temperature, and...
- Question 161: A healthcare company stores patient records in an on-premise...
- Question 162: A company that operates globally must follow regulations tha...
- Question 163: A company is building a data stream processing application. ...
- Question 164: A company stores customer data that contains personally iden...
- Question 165: A company needs to set up a data catalog and metadata manage...
- Question 166: Which of the following best describes the type of data found...
- Question 167: A company uses Amazon RDS for MySQL as the database for a cr...
- Question 168: A company has a data lake on AWS. The data lake ingests sour...
