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Difficulty: EasyServerless Development with AWS Lambda

A developer is writing an AWS Lambda function that queries a relational database. To improve the function's performance, the developer wants to reuse the database connection across multiple invocations. How should the developer initialize the database connection client to achieve this?

  1. Initialize the database connection client outside the Lambda handler function.Answer
  2. B
    Initialize the database connection client inside the Lambda handler function.
  3. C
    Store the database credentials directly within the Lambda function initialization code.
  4. D
    Pass the database connection object as a parameter within the event payload.

Answer

Initialize the database connection client outside the Lambda handler function.
Initializing the database connection client outside of the Lambda handler function allows the connection to be established once during the cold start initialization phase. When subsequent invocations reuse the execution context (warm starts), the initialized database client is already available in memory, eliminating connection setup overhead.

Step-by-Step Solution

1
Analyze how AWS Lambda handles execution context reuse.
AWS Lambda reuses the execution context (the environment running the function) for subsequent invocations if they happen within a short period (warm starts).
This behavior allows variables and objects declared outside the handler to remain in memory and be reused.
2
Determine where to place resource-intensive initialization logic.
Database clients and connection pools should be declared outside the handler function scope.
Code outside the handler is executed once during the cold start initialization phase, while code inside the handler runs on every single invocation.

Key Concept

AWS Lambda Execution Context Reuse
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Topics

Serverless Development with AWS Lambda

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