Blog · Domain

Data engineering

1 article, each explaining one topic from the documentation and ending at a stage you can play.

The Data engineering domain36 stages, about 14.5 hours, $25

DEA-C01 · Data engineering

Why Athena reads 1.2 TB to answer a four-column query

Athena bills the bytes it scans. Text is read whole; Parquet and ORC read only the columns a query names. How format, compression and file size set the bill.

Ends at Shape the FilesFree5 min read · video coming