Ravi Sir's Cards › AWS
Query vs Scan
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
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Query
Reads one partition key.
Scan
Reads the whole table.
Key points
Fast and cheap.
Slow and costly.
Example
--key-condition-expression
Use when
Normal app reads.
Rare exports and admin jobs.