Ravi Sir's Cards › AWS
What problem does a GSI solve?
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
Querying by an attribute that is not the table's primary key.
Why it matters
Avoids Scan for a second access pattern.
How / example
Orders by orderId; GSI by customerId+createdAt for "my orders".