DynamoDB

DynamoDB is a fully managed proprietary NoSQL database service that supports key-value and document data structures and is offered by Amazon as part of the Amazon Web Services portfolio. Amazon CloudWatch aggregates the DynamoDB metrics at one-minute intervals.

In DynamoDB, provisioned throughput requirements are specified in terms of capacity units: Read Capacity unit and Write Capacity unit. A unit of read capacity represents one strongly consistent read per second for items up to 4 KB in size. One write capacity unit represents one write per second for items up to 1 KB in size. Larger items will require more capacity. You can calculate the number of units of read and write capacity by estimating the number of reads or writes required per second and multiplying by the size of the items rounded up to the nearest KB.

For more information, see the Amazon DynamoDB documentation.

aws.dynamodb.ConditionalCheckFailedRequests

The number of failed attempts to perform conditional writes.

aws.dynamodb.ConsumedReadCapacityUnits

The amount of read capacity units consumed over the defined time period. Amazon CloudWatch aggregates the metrics at one-minute intervals. Use the Sum aggregation to calculate the consumed throughput. For example, get the Sum value over a span of one minute, and divide it by the number of seconds in a minute (60) to calculate the average ConsumedReadCapacityUnits per second.

aws.dynamodb.ConsumedWriteCapacityUnits

The amount of write capacity units consumed over the specified time interval. Amazon CloudWatch aggregates the metrics at one-minute intervals. Use the Sum aggregation to calculate the consumed throughput. For example, get the Sum value over a span of one minute, and divide it by the number of seconds in a minute (60) to calculate the average ConsumedWriteCapacityUnits per second.

aws.dynamodb.ProvisionedReadCapacityUnits

The number of read capacity units provisioned for a table or a global secondary index.

aws.dynamodb.ProvisionedWriteCapacityUnits

The number of write capacity units provisioned for a table or global secondary table.

aws.dynamodb.ReadThrottleEvents

The number of DynamoDB requests that exceed the amount of read capacity units provisioned.

aws.dynamodb.ReturnedBytes.GetRecords

The number of bytes returned by GetRecords operation during the specified time period.

aws.dynamodb.ReturnedItemCount

The number of items returned by query or scan operations during the specified time period.

aws.dynamodb.ReturnedRecordsCount.GetRecords

The number of stream records returned by the GetRecords operations during the specific period.

aws.dynamodb.SuccessfulRequestLatency

The number of successful requests to DynamoDB or Amazon DynamoDB Streams during the specified time period. The time period is in milliseconds.

aws.dynamodb.SystemErrors

The number of requests made to DynamoDB or Amazon DynamoDB Streams that resulted in an HTTP 500 status code during the specified time period. HTTP 500 usually indicates an internal service error.

aws.dynamodb.ThrottledRequests

The number of requests to DynamoDB that exceed the provisioned throughput limits on a resource, such as a table or an index. ThrottledRequests is incremented by one if any event within a request exceeds a provisioned throughput limit.

If any individual request for read or write events within the batch is throttled, ReadThrottleEvents metrics or WriteThrottleEvents metrics is incremented respectively.

aws.dynamodb.UserErrors

The number of requests to DynamoDB or Amazon DynamoDB Streams that returned an HTTP 400 status code during the specified time period. HTTP 400 usually indicates a client-side error.

aws.dynamodb.WriteThrottleEvents

The number of requests to DynamoDB that exceed the provisioned write capacity units for a table or a global secondary index.