Ravi Sir's Cards › AWS
Why can Scan cost more than Query?
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
What it is
You pay for items examined, not only items returned.
Why it matters
Filters run after read, so they do not save RCU the way keys do.
How / example
10 GB table Scan to find 3 rows still reads ~10 GB.