Database... uh... shifting

Howdy,
I have an application server that relies on data in an oracle database. This is a development environment. I'd like to be able to shift from one version of the database to another quickly and easily. The reason for this need is that I want to be able to shift between different installs of the application in my development environment - some installs might be clean out-of-the-box implementations, some with sample data, some with customizations I've developed, etc.
If I were using MS SQL Server, I would stop my application server, detach one logical database (& logs) from the database server, attach my desired version, then start my application server. If I script it, I can shift from one version to another in under a minute.
I'm familiar with oracle, and I know that the terminology and structure are different, but I'm hoping someone might be able to understand what I'm requesting and come up with a solution for me. Backup & restore or export/import aren't ideal options for me since these are fairly large databases and those operations can be time consuming.
The underlying structure between these different installs can be slightly different (some may have more tables than others). Oracle settings between different installs is static.
Like a lot of "enterprise" apps, direct database interaction is minimal, the application is not optimized for any particular database platform, and the database platform is essentially a high-performance storage engine for application data. I didn't write it, just trying to provide enough information so that someone can help me out.
Currently working with 11g/RHEL, but a solution that isn't platform dependent or specific to an oracle version is desirable.
I appreciate your time and your assistance,
Steve

Steve-a-rama wrote:
It uses oracle libraries to connect, and I can configure an SID for alternate implementations.
But if I have two schemas online, isn't oracle using twice the resources? Or does it share resources between schemas?
If it does use twice the resources, can I take one offline when it is not being utilized? (my dev box does not have a great deal of RAM)
Sorry that these are basic questions.While a one conceptual level one might think of an Oracle schema as being equal to a MS database, that is still not an exact analogy.
The database is a collection of data files that contain database objects. The instance is the memory and processes that access and manage the database. The schema is simply a collection of objects that belong to one user account - a namespace if you will. A schema is just a collection of objects within a given database. There is no such concept of a schema being 'online' or not. There is no such concept as logging on or connecting to a schema.+ One simply connects (logs on) to the instance+ (commonly aka the "database", but to be precise, that is not accurate). When one connects, one has a default schema that all unqualified object references will resolve to.

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desperate for some practical guidance!Well practical answer would be that stop listening to all and especially to those who tell a job X is more better(or worse) than a job Y. You have just started and I would suggest you to take a good look at all of the areas that you have mentioned you know nothing about it. Don't make a decision to be a DBA or a developer just because someone is asking you to be or not to be in it. It doesn't matter where you work, MNC or no MNC. What matters is that do you really like what you are doing and are aware about it's pros and cons. Its early for you to decide things in black and white so patience would be the key for you. I know a little about database and yet, never got tempted to learn anything else but there are many I know who after few years in database, has shifted now to different other domains (like Applications) . Some out of them are happy, some not.
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