Blog · Exam
DEA-C01: Data Engineer - Associate
2 articles, each explaining one topic from the documentation and ending at a stage you can play.
The DEA-C01 path56 stages, about 23 hours, $15
SCS-C03 · Security
Identity policy or bucket policy: which one has to allow?
In one account, either side can allow. Across accounts, both must. An account principal only delegates, and Block Public Access overrides a public policy.
Ends at Deny WinsFree6 min read · video coming
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