New schema or new instance

I have SQL Server database I would like to migrate into Oracle. The database supports a large application.
It is around 10GB. I requested a new instance but was advised I would have to pay for that but if I asked for a new Schema it could go in our current company instance. I am fine with that since it wont cost more money if I just add a new schema to our Company Oracle instance. Just curious what is the advantage of getting a new instance compared to creating a new schema for 10 GB of data?
I assume the advantage of creating a new instance is our Schema (in new instance) and work will have its own space/house and can grow in size without any issues?
Edited by: florida on May 17, 2011 2:18 PM

Just curious what is the advantage of getting a new instance compared to creating a new schema for 10 GB of data?
I assume the advantage of creating a new instance is our Schema (in new instance) and work will have its own space/house and can grow in size without any issues?Let me turn the question around. If this was an Oracle schema to be migrated to SQL Server, would you create another SQL Server instance?
No, you wouldn't. If you did, you would incur:
- Licence costs
- Additional administration overhead (you now need to back up and administer another instance).
There is no benefit of having a new 'instance' in this case. BTW, I use the word 'instance' rather 'database' here, as the concept of an instance between Oracle and SQL Server is the same, whereas a 'database' in SQL Server, is closer to a 'schema' in Oracle.
Why would there be growth issues? Unless the DBA is asleep at the wheel, I wouldn't expect that to be an issue (certainly not with a 10Gb database).

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905989 wrote:
Hi,
Oracle 10.2.0.4
We are trying to mask certain data from some users. My suggestion is that we create a new schema view_schema on the same instance where we have source tables say in source_schema.
We then create views in view_schema as below
CREATE VIEW AS SELECT * FROM source_schema.table where COLUMN_n = 'XYZ';
we then grant SELECT on these views to a role and assign new users that role to be able to see the viewed data.
So the questions below.
We can create views to look at data in another schema WITHOUT giving SELECT permissions directluy on source_schema.tanle?
This will work and there is no need to create synonyms etc
WE can manage users and views much easilier
Does this make sense and would that be better than selecting views with say table_name_view in source schema for this purpose and even creating synonyms for these views with the same tanle names in sourece_schema?
Thanks
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2. You probably want to create public synonyms for the view(s). You can refer to the view as schema.view but this is cumbersome
3. I am not sure about management being easier but added complexity should not be too bad. Write documentation describing how everything works and the object involved.
Another, more complicated but more powerful possibility is to use row level security also known as virtual private database - if you have the license. You create a profile for a table and a procedure to generate WHERE clauses to filter any query against the table and columns defined in the profile. Again, you need the license to do this.

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HI Daniel,
I appreciate your quick response.
My choice of name may not have been ideal, however changing new to another name - like gav - does not solve the problem.
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2 from v$database
3 /
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2 /
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Thanks Roelof.

Who did you create the second table, in other words, how did you COPY the table as you said...
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M.
Edited by: Marco Gralike on Feb 15, 2009 11:16 AM

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regards
}ankaj

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