Top 20 AWS Athena interview Question and answer
What is Amazon Athena?
Answer: Amazon Athena is a serverless, interactive query service that allows you to analyze data in Amazon S3 using SQL.
How does Amazon Athena work?
Answer: Amazon Athena uses Presto, an open-source distributed SQL query engine, to execute SQL queries against data stored in Amazon S3. You can use Athena to query data stored in a variety of formats, including CSV, JSON, Apache ORC, and Parquet.
What is the pricing model for Amazon Athena?
Answer: Amazon Athena charges per query, with the cost being based on the amount of data scanned by the query. You can use the Athena query editor to estimate the cost of a query before you run it.
What are some common use cases for Amazon Athena?
Answer: Some common use cases for Amazon Athena include:
Analyzing log data stored in S3
Querying data stored in S3 for business intelligence and reporting purposes
Transforming data stored in S3 for use with other AWS services, such as Amazon Redshift or Amazon EMR
How do you access Amazon Athena?
Answer: You can access Amazon Athena through the AWS Management Console, the Athena API, or the Athena query editor, which is a web-based tool for running queries and displaying results.
Can you use Amazon Athena with other AWS services?
Answer: Yes, Amazon Athena can be used in conjunction with other AWS services. For example, you can use Athena to query data stored in Amazon S3, and then use the results of that query to populate a dashboard in Amazon QuickSight or to train a machine learning model using Amazon SageMaker.
What is the difference between Amazon Athena and Amazon Redshift?
Answer: Amazon Redshift is a fully managed data warehouse service, while Amazon Athena is a query service that allows you to analyze data stored in S3. Redshift is designed for large-scale data warehousing and analytics, while Athena is better suited for ad-hoc queries and interactive analysis.
Can you use Amazon Athena with data stored in a database other than S3?
Answer: No, Amazon Athena can only be used to query data stored in S3.
How do you optimize performance in Amazon Athena?
Answer: There are a few ways to optimize performance in Athena:
Use columnar file formats, such as Apache Parquet or Apache ORC, which are optimized for efficient querying
Use partitioning to organize your data in a way that makes it easier to filter and aggregate
Use filtering and aggregation to reduce the amount of data that is scanned by your queries
Can you use Amazon Athena with data stored in multiple S3 buckets?
Answer: Yes, you can use Amazon Athena to query data stored in multiple S3 buckets, as long as those buckets are in the same AWS Region.
How do you secure data in Amazon Athena?
Answer: You can secure data in Athena by using S3 access control lists (ACLs) and bucket policies to restrict access to your data, as well as by using encryption to protect your data at rest and in transit.
Can you use Amazon Athena with data stored in a private VPC?
Answer: Yes, you can use Amazon Athena with data stored in a private VPC by creating a VPC endpoint for Athena and connecting to it using a VPN or AWS Direct Connect.
What is the Athena query editor?
The Athena query editor is a web-based tool for running queries and displaying results in Amazon Athena. It allows you to write and execute SQL queries against data stored in Amazon S3, and provides a variety of features to help you work with your data, such as a visual query builder, query history, and the ability to save and share queries. You can access the Athena query editor through the AWS Management Console.
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