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RE: Re[2]: What Sort of Privilege?

From: Mark Leith <mark_at_cool-tools.co.uk>
Date: Tue, 24 Aug 2004 14:18:02 +0100
Message-ID: <002c01c489dc$c92bfc50$0a01a8c0@mark> 





I wouldn't say "Wrong". 



Perhaps it is more a matter of preference. There are good and bad sides
to both..



Mark




-----Original Message-----



From: oracle-l-bounce_at_freelists.org


[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Goulet, Dick
Sent: 24 August 2004 14:12


To: oracle-l_at_freelists.org


Subject: RE: Re[2]: What Sort of Privilege?




Tom,



        Sorry, but you are wrong.  I prefer the many schema method as
well.



Dick Goulet


Senior Oracle DBA


Oracle Certified 8i DBA



-----Original Message-----



From: Mercadante, Thomas F [mailto:thomas.mercadante_at_labor.state.ny.us]
Sent: Tuesday, August 24, 2004 8:21 AM


To: 'oracle-l_at_freelists.org'


Subject: RE: Re[2]: What Sort of Privilege?




Jo,



Well,  The Oracle Apps applications have many schema's - much like what
= you described. I'm guessing that the majority of home-grown
applications have only one schema for all of the tables.  I could be
wrong.  In my view, it is = easier to manage.  Everything is in one
place.  It prevents you from creating = two database objects with the
same name.  Managing security is easier - = again, you can issue all
your grants from one schema, rather than needing to = keep re-logging
in.



Maybe it's just me!



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



From: jo_holvoet_at_amis.com [mailto:jo_holvoet_at_amis.com]=20
Sent: Tuesday, August 24, 2004 8:13 AM


To: oracle-l_at_freelists.org


Cc: 'oracle-l_at_freelists.org'; oracle-l-bounce_at_freelists.org
Subject: RE: Re[2]: What Sort of Privilege?




Hi Tom,



we (well, it was in place before I got here, but anyway) basically
have=20 one schema per application. We also have one schema which houses
= "common"=20 data, i.e. data used in many different places/apps; e.g.
employees,=20 customers, products, plants, .... So we have many
cross-schema FKs to = the=20 "common" data but outside that everything
is pretty well partitioned.=20 Maybe that's why I've never really had
any problems with it.



Is having what is basically a one-schema database common practice ?



mvg/regards



Jo








"Mercadante, Thomas F" <thomas.mercadante_at_labor.state.ny.us>
Sent by: oracle-l-bounce_at_freelists.org


08/24/2004 14:03


Please respond to oracle-l



=20

        To:     "'oracle-l_at_freelists.org'" <oracle-l_at_freelists.org>
        cc:=20
        Subject:        RE: Re[2]: What Sort of Privilege?






Jo,



I guess I should clarify.



If you made a consious decision to maintain multiple schema's within =
your database, then it is your choice.



I prefer one schema holding all of the database tables that make up the
corporate-wide application.



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



From: jo_holvoet_at_amis.com [mailto:jo_holvoet_at_amis.com]=20
Sent: Tuesday, August 24, 2004 7:58 AM


To: oracle-l_at_freelists.org


Cc: 'oracle-l_at_freelists.org'; oracle-l-bounce_at_freelists.org
Subject: RE: Re[2]: What Sort of Privilege?




Not sure about that. We have for example an employee table that is=20
referenced just about everywhere (e.g. which salesperson is
responsible=20 for this customer, which employee registered for this
training course,=20 which operator filed this incident report, ...).
These are all different =



apps/schemas referencing this table so I don't see how we can avoid=20
cross-schema FKs.



mvg/regards



Jo








"Mercadante, Thomas F" <thomas.mercadante_at_labor.state.ny.us>
Sent by: oracle-l-bounce_at_freelists.org


08/24/2004 13:49


Please respond to oracle-l



=20

        To:     "'oracle-l_at_freelists.org'" <oracle-l_at_freelists.org>
        cc:=20
        Subject:        RE: Re[2]: What Sort of Privilege?






Peter,



I totally agree with you.  Allowing Fk references from outside of the=20
schema is inviting confusion, duplication and disaster.  There is really
no = good reason for it.



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



From: Peter Robson [mailto:pgro_at_bgs.ac.uk]=20
Sent: Tuesday, August 24, 2004 4:57 AM


To: Jackie Brock


Cc: oracle-l_at_freelists.org


Subject: Re[2]: What Sort of Privilege?




Whoa there everybody!



While the answer is quite correct, of course (I read the FM years
ago),=20 what has not been raised is the danger of allowing reference to
multiply unhindered across numerous schemas.



Be very careful if you choose to do this, otherwise, without a little=20
care, you may manage to lock your entire database solid with conflicting
FKs!



We did, learned our lesson, and now reference is ONLY permitted within =
the one corporate schema.




peter


edinburgh


.............




JB> references




JB> All,



JB> what kind of privilege new for creating a FK constraint which=20 
JB> reference table belongs to another schema.


JB> ALTER TABLE PAM.table1
JB>  ADD CONSTRAINT FKCONS1
JB>  FOREIGN KEY (ID)
JB>  REFERENCES schema1.table2 (ID2);





JB> I have grant select,insert,update,delete for table2 BUT still I 
JB> get=20 insufficient privilege. any idea?




JB> Hamid Alavi




--=20


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Received on Tue Aug 24 2004 - 08:13:33 CDT












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