Why Is Singleton Pattern Used? Use the Singleton pattern when a class in your program should have just a single instance available to all clients; for example, a single database object shared by different parts of the program. The Singleton pattern disables all other means of creating objects of a class except for the special
What Is Instance In Database? A database instance is a set of memory structures that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database. What is the meaning of instance in database?
How Do I Add A Security Group To My Ec2 Instance? In the navigation pane, choose Instances. Select your instance, and then choose Actions, Security, Change security groups. For Associated security groups, select a security group from the list and choose Add security group. … Choose Save. How do I add a security group to