Interview Q&A / AWS & Cloud
AWS & Cloud interview questions
EC2, S3, Lambda, IAM and VPC basics, with when to pick which service.
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- What is RDS Proxy and why would you use it with Lambda?
RDS Proxy sits between your application and the database and pools connections. It stops many short-lived Lambda functions from opening thousands of connections that exhaust the database, and it speeds up failover handling.
AdvancedQuick answer1 min read - What is the difference between reserved and provisioned concurrency in Lambda?
Reserved concurrency sets aside part of your account's concurrency for one function and also caps it. Provisioned concurrency keeps a number of environments pre-initialised so invocations avoid cold starts, and it is billed for the time it is kept ready.
AdvancedQuick answer1 min read