Let us look at how to set up atomic counter in AWS DynamoDB with AWS CLI. With the support of our AWS support services at Bobcares we will learn how to set this feature up.

Why set up Atomic counter in AWS DynamoDB with AWS CLI?

It would often be beneficial if we could track some numerical data, such as website visits that are incremental in nature. Such counts must be kept in a centralized location, and updates must be atomic.

Atomic means that one request runs without interfering with another. Concurrent updates do not conflict with one another, therefore we won’t lose any data in the process.

As everyone is using ephemeral infrastructure like EC2, which is being replaced by Auto Scaling groups or containers, holding such a counter locally is not a smart idea.

DDB is the greatest solution for central storage since it is an ultra-fast, single-digit millisecond latency NoSQL database. Excellent for scaling infrared/traffic at the atomic level.

Let’s get started on generating and updating this counter.

Building the counter’s AWS DynamoDB table with CLI

This is the first step in setting up atomic counter in AWS DynamoDB with AWS CLI.

1. Log in to the DDB console.
2. Choose Create table.
3. Put the name of the table here.
4. Enter the Main Key (Partition Key).
5. We don’t need a sort key in this case because our table will only contain one counter value. Leave the rest of the settings alone and click Create.

Create a DynamoDB table

To construct a DDB table, we may utilize the Cloudformation resource block shown below:

Getting a DynamoDB database ready for counter updates

This is the next step to set up the atomic counter in AWS DynamoDB with AWS CLI. The new table information will open up. Go to the Items tab and select Create item.

After that, create a DynamoDB Item and add the specifications to the item. Save the file. The DDB table is now available for counter updates. We can use the Amazon CLI to create DDB tables, as seen below:

$ aws dynamodb put-item --table-name kerneltalks-counter --item '{"ID": { "S": "Counter" }, "TotalCount": { "N": "0" }}

Updating counter in DDB table

To update the counter, we may use the Amazon CLI command below. The counter will update itself by one every time we run the program.

We may write it in the application to execute this command/API call to update the counter.

The updated attribute in JSON format should be returned by the command. After that, we can convert it to text for using it in programming.

The same thing may be seen in the console. DDB is the counter.

That is the final steps in setting up the atomic counter in AWS DynamoDB with AWS CLI. We now have a counter in DDB that we can update from many sources via API calls.

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Conclusion

To sum up we have now seen how to set up the atomic counter in AWS DynamoDB with AWS CLI. With the support of our AWS support services team at Bobcares we have now gone through the whole setup process easily.