Which solution will meet these requirements MOST efficiently?
Create a Lambda environment variable to store the table name. Use the standard method for the programming language to retrieve the variable.
Store the table name in a file. Store the file in the /tmp folder. Use the SDK for the programming language to retrieve the table name.
Create a file to store the table name. Zip the file and upload the file to the Lambda layer. Use the SDK for the programming language to retrieve the table name.
Create a global variable that is outside the handler in the Lambda function to store the table name.
Explanations:
Using a Lambda environment variable to store the table name allows the developer to change the table name without modifying the code. Environment variables are easy to manage and can be updated in the Lambda configuration without deploying new code.
Storing the table name in a file within the /tmp folder is not efficient. While it could work, it requires file I/O operations, which can introduce latency and complexity. Additionally, the /tmp folder is ephemeral and could lead to issues if the Lambda function scales or is invoked concurrently.
Creating a file to store the table name and uploading it to a Lambda layer adds unnecessary complexity. This approach involves packaging and maintaining additional files, which complicates deployments and could introduce versioning issues. It is not as efficient as using environment variables.
Using a global variable outside the handler may retain the value between invocations but does not solve the issue of changing the table name. If the table name needs to be updated, the Lambda function code would still require modification and redeployment, contradicting the requirement of avoiding code changes.
I arrange that the answer is:
Create a Lambda environment variable to store the table name. Use the standard method for the programming language to retrieve the variable.