What is the purpose and application of the AWS Athena service?

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Reading the documentation of AWS Athena - It is noticed that this service offers a way to make queries in files stored in S3 through traditional SQL and without going through an ETL. That’s the basic idea.

But I don’t know exactly what the motivation for using this service is. It would be a kind of Elastic service?

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No, it would be more like a External table in a Hive or Oracle, for example.

You use Glue Crawler to do the infer schema and store the metadata.
From there, just do select * from sua_tabela;.

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