How to create the database name

Question

May I know,How to create database name?It is create net service name is a create database name?My database instance is PSM2006 and i connect connect user1/user1@psm2006 . Can i create another instance such as bomba ?
I want to save my oracle table in database name 'Operasi'
and save another table in database name 'Kawalan'
May i know,how to create and then view the database name?
I am new in Oracle 9i client and Oracle 9i server install on server machine

Answer 1

In Oracle:
A database is a group of files that can hold data;
An instance is the running software and memory to control one database;
A schema is a collection of tables (and other things), often related to one application;
A user is a security mechanism that allows privileges and may own one schema.
Aa schema-owning user may grant access to the schema to any other users.
A tablespace is like a disk - just a place to store things. And just like any operating system or computer, which can have many disks, a database can have many tablespaces.
(Tablespaces were created when disks were small and one table easily filled up more than one disk. So tablespace was invented to become a logical disk, or space for tables, that could combine multiple disks.)
Many schemas can use one tablespace to store their tables and indexes. Just like placing a file on a specific disk, each table can be assigned individually to a specific tablespace.
So - you want to create a user 'Operasi' and a user 'Kawalan'. Each user should become a schema owner, simply by creating tables and indexes (and other things).
Then you can create other users, 'Joe', 'Jeff', 'Tom' and 'Betty' and give them access to the tables in the 'Operasi' schema. Create users 'Buhlan', 'Karla', 'Gronk' and give them access to the tables in 'Kawalan'. And create users 'Flox' and 'Gnorf' and give them access to the tables in both 'Operasi' and 'Kawalan'.
Oracle really works best if you only have one instance, with one database, on one computer.
It is really sad that other, more recent, database groups, corrupted the terminology - the terms database ans schema come from the CODASYL days (over 30 years ago) - thereby making things much more difficult to understand by having several confusing meanings. (If you have used SQL Server, the term database is similar to Oracle's schema.)