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Without proper partitioning, Athena will scan large data sets and therefore it could end up costing a lot. It is very important to partition the data correctly - https://docs.aws.amazon.com/athena/latest/ug/partitions.html
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Yep Indranil is right about the partitioning. For a tutorial and tips about this, also see https://www.linkedin.com/pulse/using-athena-partition-projection-query-cloudtrail-other-kinsman/. It uses AWS logs as examples but the information is generic.
