Accessing source schema via synonyms

Hi,
We are using oracle 10g for source and target and OWB 10.1 for our ETLs.
The DBA is not ready to give password to connect(register) to the production source schema. so how can we register the source module in OWB?
We have thought of these 2 approaches -
1. create a schema with no tables but having synonyms to the source schema. register this schema in OWB and use accordingly
2. Hard code the schema name in the mapping(right click configuration, for each source table we can set the schema name). but if i change my source schema name then i will have to re-visit all the mappings and change here, or is it there any other method?
Pls let me know which is better approach or if there is any other way to handle this
Thanks
Sagar

Hi Igor,
Would using synonyms affect the performance of mappings? Since our warehouse staging area requires making multiple connections to tables in the source system tables, would the synonym approach slow down retrieval of data from these source systems?
Does creating synonyms mean creating those many dblinks to the table on which the synonym is created?

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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
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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
1. You can create the view in another schema (first granting privileges to the view schema) without granting privileges from the source schema
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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null

You can only access an object in another user's schema if you either:
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(b) A synonymn has been created to access the object: CREATE SYNONYM OBJECT FOR SCHEMA.OBJECT.
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Edited by: [email protected] on Jun 17, 2010 6:45 AM

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Accessing source schema via synonyms

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