Hi guys, What is a server instance. The...

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Sam Kaur

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Hi guys, What is a server instance. The document i am reading states their is 1 server under which there are 4 instances, what does this mean in detail?
 
Ravindra Nath Thakur any comment will be appreciated
 
This is an concept of visualization. Physically one server will be there and virtually 4 instances will be created for the server
 
Its like in one windows machine you can run multiple instance of applications e.g. 3 instance of jboss or tomcat or weblogic
 
1. An instance is a copy of particular entity it can be any OS or Servers like DB Server,Application server etc. 2.Example : An instance of the Database Engine is a copy of the database.exe executable that runs as an operating system service. Each instance manages several system databases and one or more user databases. Each computer can run multiple instances of the Database Engine. Applications connect to the instance in order to perform work in a database managed by the instance. 3. Instance can be server installed on virtual machines
 
Thanks Ravindra Nath ThakurValiyullah Mohammed Saravanan Subramani Gounder for the great info. It was very helpful.
 
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