How to switch database

Hello Friends,
I am new to Oracle & I am using oracle Enterprise Manager Console for creating a new database.While creating new database it asks for Hostname & SID.The Hostname of my system is neha & SID is also neha.So The name of new database is appearing in Tree view as neha_neha - system as sysdba.
I am confused now.Is neha_neha the name of my new database???& Suppose if I want to create another database so will I give the same hostname & SID again? Coz Hostname & SID will remain same.
After that I want to use this neha_neha database from sql plus.How to switch the database from my previous database to this new database???Please help me I am stuck here.Thanx in advance.
Neha

Every database within the same Oracle instance requires a unique sid. Let's say you install oracle to a server (ONE) and create database with sid A. You would be required to enter a unique sid, like B, the next time you tried to create a new database.
Sid is not required to match the hostname of the computer. You can name an oracle database whatever you wish as long as it adheres to the Oracle guidelines.
However, if you have a separate oracle environment on a different server (TWO) then you can create a database with the same name as one which resides on server ONE. Oracle maps each particular database to it's host using a file called the TNSNames.ora...and this is how you'd switch between the two. Pls look at the documentation for information about it.
Hope this helps.

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