Compute Selection Start by reviewing the available choices for compute resources on AWS. They fall under three subcategories: virtual instances with Amazon Elastic Cloud Compute (EC2), containers with Amazon Elastic Container Service (ECS) or Amazon Elastic Kubernetes Service (EKS), and functions with AWS Lambda. The following sections discuss each of them. EC2 Instances With Amazon […]

Packages As you saw in the previous example, Java classes are grouped into packages. The import statement tells the compiler which package to look in to find a class. This is similar to how mailing a letter works. Imagine you are mailing a letter to 123 Main Street, Apartment 9. The mail carrier first brings […]

CloudWatch Dashboards While the collection of metrics generating lines and lines of information on disparate files serves a purpose for tracking particular indicators, tracking a number of these over time is much easier in a graphical format. AWS CloudWatch dashboards allow you to create customizable, real-time visualizations of your metrics, resources, and applications. You can […]

Virtual Private Gateway The AWS virtual private gateway is a virtual VPN endpoint that terminates a site-to-site VPN connection that attaches to a single VPC. A maximum of 10 external VPN tunnels that are not VPC networking locations per virtual private gateway are supported, and each of the tunnels connects using the IPSec protocol. A […]

Principle #4 – Experiment More Often On AWS, you have instant access to all these advanced, serverless, and many other services. Therefore, you should feel encouraged to experiment with them, either to validate a concept or simply to test different configurations (compute, storage, and others) until you find the one that helps your solution deliver […]

Cram Quiz Answer these questions. The answers follow the last question. If you cannot answer these questions correctly, consider reading this section again until you can. 1. You are examining a route table in your VPC and find the following route entry: “Destination : 10.0.0.0/24 and Target : Local”. What type of route is this? A. […]

5.1  DML Statements and Operations DML refers to the set of statements and operations that you can use to interact with records in the Salesforce database. DML operations are used to create, retrieve, update, and delete records in various Salesforce objects, such as custom and standard objects like accounts, contacts, opportunities, and more. Salesforce provides […]

Passing Parameters to a Java Program Let’s see how to send data to our program’s main() method. First, we modify the Zoo program to print out the first two arguments passed in: public class Zoo { public static void main(String[] args) { System.out.println(args[0]); System.out.println(args[1]); } } The code args[0] accesses the first element of the […]

Important note Of course, grid search cannot guarantee that you will come up with your target performance. That depends on the algorithm and the training data. A common practice, though, is to define the values for testing by using a linear space or log space, where you can manually set the limits of the hyperparameter […]

CloudWatch Alarms With the metrics that CloudWatch provides, the service also allows you to monitor metrics and events that can automatically initiate actions (such as sending out an SNS notification) when certain conditions are met, in near real time. CloudWatch alarms can be used for a multitude of purposes, including detecting unusual behavior or performance […]