Difference between Oracle SID and an Oracle Database

Hi
Can any one please differeniate what exactly is the difference between an Oracle SID and a new Oracle Database?
We just need to create another instance of an application (so we need another copy of all tables).
So either we can:
1. New database SID created or
2. New user created in existing schema or
3. New database provided
Which is the best approach?

Hi,
New database SID created orThat is equivalent of creating a new database in your case.
New user created in existing schema orYou meant new schema(user) created in existing database. I assumed this because you do not want both application to update the same table copy, but different copy.
3. New database providedIt all depends on your you whether you want to create a new database or a new schema for getting another copy of table.
Some points which I take in mind
1) If I have a production database and I need to create a new set of tables for testing or any other purpose, I would create a new database.
2) If I have a test database and I need to create a new set of tables for testing or any other purpose, if possible I would create a new schema in existing database.
3) If I am running less in resources(hardware/memory), I would be createing a new schema in existing database.
4) If I am not running less in resources and I would to keep these two copies entirely different, then from security purpose I would create a new database.
Regards
Anurag Tibrewal.

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