Using database link to connect to two databases

Hi guys,
Here's my question. I need to give a contractor Select rights on tables located in two schemas located on two different servers. One server is dev and one is prod. Let's say we have schema user: EMPLOYEE on dev and schema user: DEPARTMENT on prod. The outside contractor needs select rights on all tables in DEPARTMENT schema but only needs select on a few tables ( 4 to be exact) from EMPLOYEE schema.
My initial train of thougth is: CREATE a user named: TEST (random name of course, just used for an example) for contractor on prod. Give user TEST select rights on all tables in DEPARTMENT schema.
Create database link to dev server so user TEST can access EMPLOYEE schema.
How do i go about limiting the user TEST via the database link to only view the 4 tables from EMPLOYEE instead of all teh tables?
Should I also consider doing this scenario in reverse? Creating user TEST on dev, giving TEST rights to the 4 tables in EMPLOYEE, then creating the database link to connect to department schema on prod database??
Any help will be appreciated. Thanks in advance.

zephyr223 wrote:
Hi guys,
Here's my question. I need to give a contractor Select rights on tables located in two schemas located on two different servers. One server is dev and one is prod. Let's say we have schema user: EMPLOYEE on dev and schema user: DEPARTMENT on prod. The outside contractor needs select rights on all tables in DEPARTMENT schema but only needs select on a few tables ( 4 to be exact) from EMPLOYEE schema.
My initial train of thougth is: CREATE a user named: TEST (random name of course, just used for an example) for contractor on prod. Give user TEST select rights on all tables in DEPARTMENT schema.
Create database link to dev server so user TEST can access EMPLOYEE schema.
How do i go about limiting the user TEST via the database link to only view the 4 tables from EMPLOYEE instead of all teh tables? Only grant them access to those four tables from EMPLOYEE. You have to explicitly grant privileges anyways, and since there is no GRANT SELECT ON <SCHEMA> ability it should not be that difficult.
Should I also consider doing this scenario in reverse? Creating user TEST on dev, giving TEST rights to the 4 tables in EMPLOYEE, then creating the database link to connect to department schema on prod database?? Are you creating database links as the EMPLOYEE and DEPARTMENT users? If so, I would caution against that. Create a "current user" database link for TEST. I think you can manage privileges better that way.
HTH!
HTH!

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Regards,
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Edited by: jarola on Aug 1, 2011 3:34 PM
See documentation
http://download.oracle.com/docs/cd/E10513_01/doc/appdev.310/e10499/advnc.htm#BABBFICH

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     Oracle DataType: http://www.ss64.com/orasyntax/datatypes.html
                         http://www.adp-gmbh.ch/ora/misc/datatypes/index.html
     Oracle Sequence and Create table: http://www.java2s.com/Tutorial/Oracle/0100__Sequences/Usingasequencetopopulateatablescolumn.htm

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HTH
RK
Message was edited by:
RKravcenko

Using database link to connect to two databases

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