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When you create a new table schema in Athena, Athena stores the schema in a data catalog and uses it when you run queries. Athena uses an approach known as schema-on-read, which means a schema is projected on to your data at the time you run a query. This eliminates the need for data loading or transformation. Nov 29, 2021 · As Athena is serverless, it needs extra services to contain and structure the data. And remember that DDL operations (such as CREATE, ALTER and DROP), partition administration, and failed queries are free of charge.It is also important to know how it works: Athena is a combination of Presto syntax and ANSI SQL.. Facts about Athena..
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