Ravi Sir's Cards › AWS
Why is Scan OK in the lab list but not for production user lists?
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
Lab has few items; production must Query by user key.
Why it matters
Scan cost and latency grow with table size.
How / example
Add userId PK (or GSI) before real users arrive.