[20 Days of DynamoDB] Day 6 - Atomic counters with UpdateItem

Need to implement atomic counter using DynamoDB? If you have a use-case that can tolerate over-counting or under-counting (for example, visitor count), use the UpdateItem API.

Here is an example that uses the SET operator in an update expression to increment num_logins attribute:

    resp, err := client.UpdateItem(context.Background(), &dynamodb.UpdateItemInput{
        TableName: aws.String(tableName),
        Key: map[string]types.AttributeValue{
            "email": …

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