# DAX SDK for Go Follow this procedure to run the Amazon DynamoDB Accelerator (DAX) SDK for Go sample application on your Amazon EC2 instance. **To run the SDK for Go sample for DAX** 1. Set up the SDK for Go on your Amazon EC2 instance: 1. Install the Go programming language (`Golang`). ``` sudo yum install -y golang ``` 1. Test that Golang is installed and running correctly. ``` go version ``` A message like this should appear. ``` go version go1.15.5 linux/amd64 ``` The remaining instructions rely on module support, which became the default with Go version 1.13. 1. Install the sample Golang application. ``` go get github.com/aws-samples/aws-dax-go-sample ``` 1. Run the following Golang programs. The first program creates a DynamoDB table named `TryDaxGoTable`. The second program writes data to the table. ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command create-table ``` ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command put-item ``` 1. Run the following Golang programs. ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command get-item ``` ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command query ``` ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command scan ``` Take note of the timing information—the number of milliseconds required for the `GetItem`, `Query`, and `Scan` tests. 1. In the previous step, you ran the programs against the DynamoDB endpoint. Now, run the programs again, but this time, the `GetItem`, `Query`, and `Scan` operations are processed by your DAX cluster. To determine the endpoint for your DAX cluster, choose one of the following: + **Using the DynamoDB console** — Choose your DAX cluster. The cluster endpoint is shown on the console, as in the following example. ``` dax://my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com ``` + **Using the AWS CLI** — Enter the following command. ``` aws dax describe-clusters --query "Clusters[*].ClusterDiscoveryEndpoint" ``` The cluster endpoint is shown in the output, as in the following example. ``` { "Address": "my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com", "Port": 8111, "URL": "dax://my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com" } ``` Now run the programs again, but this time, specify the cluster endpoint as a command line parameter. ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dax -command get-item -endpoint my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com:8111 ``` ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dax -command query -endpoint my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com:8111 ``` ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dax -command scan -endpoint my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com:8111 ``` Look at the rest of the output, and take note of the timing information. The elapsed times for `GetItem`, `Query`, and `Scan` should be significantly lower with DAX than with DynamoDB. 1. Run the following Golang program to delete `TryDaxGoTable`. ``` go run ~/go/pkg/mod/github.com/aws-samples/aws-dax-go-sample@v1.0.2/try_dax.go -service dynamodb -command delete-table ```