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

From: Goulet, Dick <DGoulet_at_vicr.com>
Date: Tue, 24 Aug 2004 09:12:00 -0400
Message-ID: <4001DEAF7DF9BD498B58B45051FBEA650146C66D@25exch1.vicorpower.vicr.com> 





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 get=20
JB> insufficient privilege. any idea?




JB> Hamid Alavi




--=20


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Received on Tue Aug 24 2004 - 08:08:11 CDT












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