Viewing DAX metrics and dimensions
When you interact with Amazon DynamoDB, it sends metrics and dimensions to Amazon CloudWatch. You can use the following procedures to view the metrics for DynamoDB Accelerator (DAX).
To view metrics (console)
Metrics are grouped first by the service namespace, and then by the various dimension combinations within each namespace.

Open the CloudWatch console at https://console.amazonaws.cn/cloudwatch/
. 
In the navigation pane, choose Metrics.

Select the DAX namespace.
To view metrics (Amazon CLI)

At a command prompt, use the following command.
aws cloudwatch listmetrics namespace "AWS/DAX"
DAX metrics and dimensions
The following sections contain the metrics and dimensions that DAX sends to CloudWatch.
DAX Metrics
The following metrics are available from DAX. DAX sends metrics to CloudWatch only when they have a nonzero value.
CloudWatch aggregates the following DAX metrics at oneminute intervals:

CPUUtilization

CacheMemoryUtilization

NetworkBytesIn

NetworkBytesOut

NetworkPacketsIn

NetworkPacketsOut

GetItemRequestCount

BatchGetItemRequestCount

BatchWriteItemRequestCount

DeleteItemRequestCount

PutItemRequestCount

UpdateItemRequestCount

TransactWriteItemsCount

TransactGetItemsCount

ItemCacheHits

ItemCacheMisses

QueryCacheHits

QueryCacheMisses

ScanCacheHits

ScanCacheMisses

TotalRequestCount

ErrorRequestCount

FaultRequestCount

FailedRequestCount

QueryRequestCount

ScanRequestCount

ClientConnections

EstimatedDbSize

EvictedSize

CPUCreditUsage

CPUCreditBalance

CPUSurplusCreditBalance

CPUSurplusCreditsCharged
Not all statistics, such as Average
or Sum
, are applicable for every
metric. However, all of these values are available through the DAX console, or by using the CloudWatch
console, Amazon CLI, or Amazon SDKs for all metrics. In the following table, each metric has a list of valid
statistics that are applicable to that metric.
Metric  Description 

CPUUtilization 
The percentage of CPU utilization of the node or cluster. Units: Valid Statistics:

CacheMemoryUtilization 
The percentage of available cache memory that is in use by the item cache
and query cache on the node or cluster. Cached data starts to be evicted prior to
memory utilization reaching 100% (see Units: Valid Statistics:

NetworkBytesIn 
The number of bytes received on all network interfaces by the node or cluster. Units: Valid Statistics:

NetworkBytesOut 
The number of bytes sent out on all network interfaces by the node or cluster. This metric identifies the volume of outgoing traffic in terms of the number of bytes on a single node or cluster. Units: Valid Statistics:

NetworkPacketsIn 
The number of packets received on all network interfaces by the node or cluster. Units: Valid Statistics:

NetworkPacketsOut 
The number of packets sent out on all network interfaces by the node or cluster. This metric identifies the volume of outgoing traffic in terms of the number of packets on a single node or cluster. Units: Valid Statistics:

GetItemRequestCount 
The number of Units: Valid Statistics:

BatchGetItemRequestCount 
The number of Units: Valid Statistics:

BatchWriteItemRequestCount 
The number of Units: Valid Statistics:

DeleteItemRequestCount 
The number of Units: Valid Statistics:

PutItemRequestCount 
The number of Units: Valid Statistics:

UpdateItemRequestCount 
The number of Units: Valid Statistics:

TransactWriteItemsCount 
The number of Units: Valid Statistics:

TransactGetItemsCount 
The number of Units: Valid Statistics:

ItemCacheHits 
The number of times an item was returned from the cache by the node or cluster. Units: Valid Statistics:

ItemCacheMisses 
The number of times an item was not in the node or cluster cache, and had to be retrieved from DynamoDB. Units: Valid Statistics:

QueryCacheHits 
The number of times a query result was returned from the node or cluster cache. Units: Valid Statistics:

QueryCacheMisses 
The number of times a query result was not in the node or cluster cache, and had to be retrieved from DynamoDB. Units: Valid Statistics:

ScanCacheHits 
The number of times a scan result was returned from the node or cluster cache. Units: Valid Statistics:

ScanCacheMisses 
The number of times a scan result was not in the node or cluster cache, and had to be retrieved from DynamoDB. Units: Valid Statistics:

TotalRequestCount 
Total number of requests handled by the node or cluster. Units: Valid Statistics:

ErrorRequestCount 
Total number of requests that resulted in a user error reported by the node or cluster. Requests that were throttled by the node or cluster are included. Units: Valid Statistics:

ThrottledRequestCount 
Total number of requests throttled by the node or cluster. Requests that were throttled by DynamoDB are not included, and can be monitored using DynamoDB Metrics. Units: Valid Statistics:

FaultRequestCount 
Total number of requests that resulted in an internal error reported by the node or cluster. Units: Valid Statistics:

FailedRequestCount 
Total number of requests that resulted in an error reported by the node or cluster. Units: Valid Statistics:

QueryRequestCount 
The number of query requests handled by the node or cluster. Units: Valid Statistics:

ScanRequestCount 
The number of scan requests handled by the node or cluster. Units: Valid Statistics:

ClientConnections 
The number of simultaneous connections made by clients to the node or cluster. Units: Valid Statistics:

EstimatedDbSize 
An approximation of the amount of data cached in the item cache and the query cache by the node or cluster. Units: Valid Statistics:

EvictedSize 
The amount of data that was evicted by the node or cluster to make room for newly requested data. If the miss rate goes up, and you see this metric also growing, it probably means that your working set has increased. You should consider switching to a cluster with a larger node type. Units: Valid Statistics:

CPUCreditUsage 
The number of CPU credits spent by the node for CPU utilization. One CPU credit equals one vCPU running at 100% utilization for one minute or an equivalent combination of vCPUs, utilization, and time (for example, one vCPU running at 50% utilization for two minutes or two vCPUs running at 25% utilization for two minutes). CPU credit metrics are available at a fiveminute frequency only. If you specify a period greater
than five minutes, use the Units: Valid Statistics:

CPUCreditBalance 
The number of earned CPU credits that a node has accrued since it was launched or started. Credits are accrued in the credit balance after they are earned, and removed from the credit balance when they are spent. The credit balance has a maximum limit, determined by the DAX node size. After the limit is reached, any new credits that are earned are discarded. The credits in the Units: Valid Statistics:

CPUSurplusCreditBalance 
The number of surplus credits that have been spent by a DAX node when its
The Units: Valid Statistics:

CPUSurplusCreditsCharged 
The number of spent surplus credits that are not paid down by earned CPU credits, and which thus incur an additional charge. Spent surplus credits are charged when the spent surplus credits exceed the maximum number of credits that the node can earn in a 24hour period. Spent surplus credits above the maximum are charged at the end of the hour or when the node is terminated. Units: Valid Statistics:

The CPUCreditUsage
, CPUCreditBalance
, CPUSurplusCreditBalance
, and
CPUSurplusCreditsCharged
metrics are available only for T3 nodes.
Dimensions for DAX Metrics
The metrics for DAX are qualified by the values for the account, cluster ID, or cluster ID and node ID combination. You can use the CloudWatch console to retrieve DAX data along any of the dimensions in the following table.
Dimension 
CloudWatch Metric Namespace 
Description 

Account

DAX Metrics

Provides aggregated statistics across all nodes in an account. 
ClusterId

Cluster Metrics

Limits the data to a cluster. 
ClusterId, NodeId

ClusterId, NodeId

Limits the data to a node within a cluster. 