Cross Database Referencial Integrity

Feb 12, 2008

Using SQL Server 2005, I have two databases.

AppDB - The main application database.
GeoDB - A somewhat static ZIP code / states / other geographic stuff database



I need to have some foreign key columns in tables in AppDB reference columns in the GeoDB database tables. Eventually other application database besides AppDB will be doing the same thing in our infrastructure. After googling and reading for days, here is what I think I know:

You cannot create foreign keys that reference tables in another database in SQL Server.

You cannot create foreign keys that reference columns in a view, and you definitely cannot make an index on a view that has base tables in another database.
You can create a trigger that references tables in another database, but this can be flaky? (nested/recursive trigger problem).

SQLServer2005 supports multiple schemas within the same database. Maybe I should logically separate my databases this way? Seems like it would be a tough solution to manage since I already have some databases live in production that will eventually use this 'static' GeoDB. Also, seems like itwouldn't be as portable as keeping the GeoDB info in its own database, but maybe I'm being too software engineer-ish here - afraid of low cohesion, high coupling.

I will greatly appreciate any advice I can get, any links to articles, or any more options I am missing.





Thanks,Adam Nofsinger
ucnmedia.com

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Multiple Database / Cross Database Referencial Integrity (foreign Keys)

Feb 12, 2008

Using SQL Server Express 2005, I have two databases.  AppDB - The main application database.GeoDB - A somewhat static ZIP code / states / other geographic stuff databaseI need to have some foreign key columns in tables in AppDB reference columns in the GeoDB database tables.  Eventually other application database besides AppDB will be doing the same thing in our infrastructure. After googling and reading for days, here is what I
think I know:You cannot create foreign keys that reference tables in another database in SQL Server.You
cannot create foreign keys that reference columns in a view, and you definitely cannot make an index on a view that has base tables in another database.You can create a trigger that references tables in another database, but this can be flaky?  (nested/recursive trigger problem).SQLServer
2005 supports multiple schemas within the same database.  Maybe I should logically separate my databases this way?  Seems like it would be a tough solution to manage since I already have some databases live in production that will eventually use this 'static' GeoDB.  Also, seems like it
wouldn't be as portable as keeping the GeoDB info in its own database,
but maybe I'm being too software engineer-ish here - afraid of low
cohesion, high coupling.I will greatly appreciate any advice I can get, or any more options I am missing.  Thanks,Adam Nofsingerucnmedia.com

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Referencial Integrity Question

Mar 24, 2008

Hi,

Let's say you have these 3 tables

--------------------------------------------------------------

use tempdb
go

create table TableMain (
RowID int primary key identity(1, 1)
, ItemTypeID tinyint NOT NULL
, Details varchar(200) NOT NULL
)
go

create table TableDetails (
DetailRowID int primary key identity(1, 1)
, RowID int NOT NULL
, ItemTypeID tinyint NOT NULL
, Details varchar(200) NOT NULL

)
go

create table ItemTypes (
ItemTypeID tinyint primary key identity(1, 1)
, Details varchar(50) NOT NULL
)
go

create unique nonclustered index IX_TableMain__ItemTypeID__RowID on TableMain (ItemTypeID, RowID)
go

alter table TableDetails
add constraint FK_TableDetails_TableMain__RowID__ItemTypeID foreign key (ItemTypeID, RowID) references TableMain(ItemTypeID, RowID);
go

alter table TableMain
add constraint FK_TableMain_ItemTypes__ItemTypeID foreign key (ItemTypeID) references ItemTypes(ItemTypeID);
go

/*
drop table TableDetails
drop table TableMain
drop table ItemTypes
*/

--------------------------------------------------------------

As you can see TableDetails references TableMain by ItemTypeID and RowID. TableMain also has a foreign key on ItemTypeID.

In this example although there is no references between TableDetails and ItemTypes on ItemTypeID field, referential integrity is still maintain because of the foreign key on TableMain (ItemTypeID, RowID)


So here is my question. Although referential integrity is maintain with this structure, would you guys still create a foreign key on TableDetails (ItemTypeID), i.e.:

alter table TableDetails
add constraint FK_TableDetails_ItemTypes__ItemTypeID foreign key (ItemTypeID) references ItemTypes(ItemTypeID);
go




There might not be any right or wrong, it might be a personal preference sort of thing. To me it seems performance wise it's better to not create this extra contraints since it doesn't add any additional integrity, on the other hand when looking at a DB schema this extra constraint might help understanding what's going on. Also perhaps it helps SQL Server in picking the right execution plan but that I am not sure.

Perhaps the solution is to create the constraint with a NOCHECK on it... is it?

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Hi,

We are in search of beta testers for our new software tool for SQL Server : Remote Keys allows you to define and enforce cross databases integrity constraint. With Remote Keys, you can create a foreign key between to SQL tables located in distinct databases.

Beta version can be downloaded here : www.remote-keys.com.
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Hi,

We are in search of beta testers for our new software tool for SQL Server :
Remote Keys allows you to define and enforce cross databases integrity
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tables located in distinct databases.

New version (beta 2) can be downloaded here : http://www.remote-keys.com

Thank you,

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Hi,

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cherriesh

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I searched the forum on this topic and saw the following explanation on Check Database Integrity Task, by DarrenSQLIS.


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Regards

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