Showing posts with label differentfilegroup. Show all posts
Showing posts with label differentfilegroup. Show all posts

Saturday, February 25, 2012

Add Foreign Key Constraint in filegroup

Hi,
I'd like to create a foreign key constraint and store it in a different
filegroup than "PRIMARY"
For this, I've created a new filegroup named "INDEX"
This is my script :
ALTER TABLE [dbo].[T_FILE] WITH NOCHECK ADD
CONSTRAINT [FK_T_FILE_IDFOL_T_FOLDER] FOREIGN KEY
(
[FIL_IDFOLDER]
) REFERENCES [dbo].[T_FOLDER] (
[FOL_IDFOLDER]
) ON DELETE CASCADE
ON [INDEX]
GO
And it doesn't work !
But what is very strange, is that I can create a primary key constraint
correctly on this filegroup :
ALTER TABLE [dbo].[T_FILE] WITH NOCHECK ADD
CONSTRAINT [PK_T_FILE] PRIMARY KEY CLUSTERED
(
[FIL_IDFILE]
) ON [INDEX]
GO
And this works !
It would be great if someone can telle me where my error is !
ThanxFilegroups are containers for storing data. Data are either data pages or in
dex pages. The reason
you can specify a filegroup when you define a primary key is that it automat
ically creates an index
for you,. so the file group you specify defines where that index will be sto
red. A foreign key
doesn't come with an index.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
Blog: http://solidqualitylearning.com/blogs/tibor/
<jerome.avoustin@.gmail.com> wrote in message
news:1137404237.380973.84080@.g43g2000cwa.googlegroups.com...
> Hi,
> I'd like to create a foreign key constraint and store it in a different
> filegroup than "PRIMARY"
> For this, I've created a new filegroup named "INDEX"
> This is my script :
> ALTER TABLE [dbo].[T_FILE] WITH NOCHECK ADD
> CONSTRAINT [FK_T_FILE_IDFOL_T_FOLDER] FOREIGN KEY
> (
> [FIL_IDFOLDER]
> ) REFERENCES [dbo].[T_FOLDER] (
> [FOL_IDFOLDER]
> ) ON DELETE CASCADE
> ON [INDEX]
> GO
> And it doesn't work !
> But what is very strange, is that I can create a primary key constraint
> correctly on this filegroup :
> ALTER TABLE [dbo].[T_FILE] WITH NOCHECK ADD
> CONSTRAINT [PK_T_FILE] PRIMARY KEY CLUSTERED
> (
> [FIL_IDFILE]
> ) ON [INDEX]
> GO
> And this works !
> It would be great if someone can telle me where my error is !
> Thanx
>