concept between MS SQL and Oracle

Hi, everyone, I'm very new to Oracle. Read a few books and confused about some basic concepts:
in the world of MS SQL, you can install several INSTANCE on a physical server, in each INSTANCE, you can create multiple databases, each DATABASE has it is the log data\transaction the disk file.

In the Oracle world, my understanding is, INSTANCE = structure memory + the physical database file (which is about identifying MS SQL). similar to MS SQL, you can have multiple INSTANCEs on each physical server. but who is the "DATABASE" in the oracle world? The closest I think is TABLESPACE. I can assign one or more physical data for each TABLESPACE files. but all the TABLESPACE set the log to roll forward inside the same undo TABLESPACE? In addition, for each application, I need to create one or more table SPACE inside an INSTANCE (it's what I usually do in MS SQL)?

Thank you for your help. Please forgive me if my question is stupid.

Published by: user3614365 on June 14, 2012 14:57

Please forgive me if my question is stupid.

Firs of all, your questions are not stupid at all. You can get better understand by defining analogies and comparisons with a product, with that you're familiar with one product. I used the same method when I learned about MS SQL comparing it with Oracle.

So, welcome aboard the Oracle!

in the world of MS SQL, you can install several INSTANCE on a physical server,

You can have multiple instances of Oracle, belonging to the same or a House of Oracle on the same physical machine.

within each INSTANCE, you can create multiple databases

In the Oracle instance, you can have only one database. That's how it is.

each DATABASE has it is the log data\transaction the disk file.

Even in MS SQL there may be several files of data per database.

>
In the Oracle world, my understanding is, INSTANCE = structure memory + the physical database file (which is about identifying MS SQL). similar to MS SQL, you can have multiple INSTANCEs on each physical server.
>
Yes

>
but who is the "DATABASE" in the oracle world? The closest I think is TABLESPACE. I can assign one or more physical data for each TABLESPACE files. but all the TABLESPACE set the log to roll forward inside the same undo TABLESPACE?
>
Here is little similarity between the Oracle TABLESPACE and the MS SQL database.
In MS SQL Database has not only the files associated with it, it has its own security and piece of data dictionary. It can have its own rating, you can detach an instance and attach to the other, you can save some separately, etc...
I'd say MS DB's unit "autonomous and self-containing", comparing to Oracle TS.
Oracle TS is a way to organize the data files and definition some default of the common properties of storage for tables and other segments contained in TS.
TS of Oracle have no separate security and data dictionary. Normally TS can be spare an instance and attached to the other. However, there is a special type of TS - transportable tablespace, which can be seen as a little more closely what is DB Ms.
In any case Oracle TS is not even close to MS DB.
And he does not need to be. It has a completely different purpose.

In addition, for each application, I need to create one or more table SPACE inside an INSTANCE (it's what I usually do in MS SQL)?

You don't have to. But you better to do this way, a point of view organization data. To make things look well organized.
Sometimes a single application can use multiple TS, for example when he needs different block size for some tables.
Also, you can share Costs between multiple applications, as you can do with MS DB.

What else is different?
There is no separation between the connections and users in Oracle db. It is an entity - USER. He has his security settings and can have its database objects.

In Oracle, can only be a single scheme by the user, even named as a user. Basically it's the same thing - user and schema is the same thing and created and managed by the same CREATE/ALTER USER command.
However, when we talk about storage and a place where objects belong to we say SCHEMA.
When we talk about security and the owner where the objects belong to-we say USER. :)
Schema is like Home in OS users. What the user creates belongs to his 'home' - the schema. And the user is the owner of it.
If a user creates something of the other schema this thing belongs to the than the other schema and that another user will be owner, not the user who calls the CREATE statement.

However, a user can change the current schema for the current session, for do not implicitly by specifying another schema as a prefix for the objects in this schema to another.
CONNECT scott
SELECT * FROM joe.emp;
ALTER SESSION SET CURRENT_SCHEMA = joe;
SELECT * FROM emp;

In MS SQL schemas are more like directories, there may be objects of different users in the same pattern and the same user in different schemas.

In Oracle, there are DB that is similar to the linked server connection.
When it is called, DB Link is specified after the name of the object, separated by @.
SELECT * FROM emp@anotherDB;

That's the main differences.

Oh yes, Oracle is a release management engine, and MS SQL's engine block, but it can be anything from the latter.

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