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Optimizing AWS Cron Jobs: How to Schedule a Lambda Function Every Minute for Two Hours on Saturdays

Learn how to efficiently schedule your AWS Lambda function with cron expressions to avoid unnecessary costs while running it every minute for a specific timeframe on Saturdays.
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This video is based on the question https://stackoverflow.com/q/69600841/ asked by the user 'Collin Bell' ( https://stackoverflow.com/u/9967715/ ) and on the answer https://stackoverflow.com/a/69600874/ provided by the user 'Marcin' ( https://stackoverflow.com/u/248823/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: AWS cron jobs to run every minute across a span of time across two hours?

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license.

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Optimizing AWS Cron Jobs: How to Schedule a Lambda Function Every Minute for Two Hours on Saturdays

Managing AWS resources effectively is essential for any developer or system administrator. One common task is scheduling AWS Lambda functions to run at specific times using cron expressions. However, what if your initial setup is not as efficient as it could be? This guide dives into a real-world scenario where we will optimize a Lambda function's schedule to avoid unnecessary costs while efficiently running it each minute within a defined timeframe.

The Problem: Inefficient Scheduling

You may find yourself in a situation similar to one shared by a user. The Lambda function is currently scheduled using the following cron expression:

[[See Video to Reveal this Text or Code Snippet]]

This setup means the function runs every minute from 19:00 to 20:59 on Saturdays, which is not optimal since the actual need is only for a specific period from 19:50 to 20:30. Running the function for that additional hour is unnecessary and results in unwarranted charges.

The Solution: Splitting the Cron Expressions

To effectively narrow down the function’s schedule, we can split the cron job into two separate expressions. This way, the function will run only during the required timeframes.

Step-by-Step Instructions

Schedule the First Expression (19:50 - 19:59)
Here, we want the function to kick off at the time of 19:50 and stop at 19:59.

The cron expression will look like this:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

50/1 means start at minute 50 and execute every 1 minute until the hour ends.

19 indicates the 19:00 hour.

? signifies "no specific value" for the day of the month.

* means every month.

SAT confines it to Saturdays.

Schedule the Second Expression (20:00 - 20:30)
The next portion of the schedule is from 20:00 until 20:30.

The cron expression for this schedule will be:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

0-30/1 specifies that the function will run from minute 0 to minute 30 every minute.

20 indicates the hour 20:00.

The rest of the expression remains the same as described above.

Summary of Cron Expressions

Time PeriodCron Expression19:50 - 19:5950/1 19 ? * SAT *20:00 - 20:300-30/1 20 ? * SAT *Conclusion: Efficient AWS Scheduling

By adjusting your cron expressions as outlined above, you can effectively reduce the runtime of your AWS Lambda function on Saturdays. This strategy not only conserves resources but also helps manage costs, allowing you to focus on productivity without the worry of unnecessary charges.

Remember, optimizing your AWS resources is always a good practice. When in doubt, evaluate your cron jobs and adjust the scheduling to suit your actual needs—like running your function every minute only during necessary times.

Implement these tips today and watch your AWS billing reflect the efficiency you've introduced!

Видео Optimizing AWS Cron Jobs: How to Schedule a Lambda Function Every Minute for Two Hours on Saturdays канала vlogize
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