Cannot create foreign key ‘%.*ls’ because it references object ‘%.*ls’ whose clustered index ‘%.*ls’ is disabled.

Error Message:
Msg 1771, Level 16, State 1, Line 12
Cannot create foreign key ‘%.*ls’ because it references object ‘%.*ls’ whose clustered index ‘%.*ls’ is disabled.

Severity level:
16.

Description:
This error message appears when you try to create a foreign key constraint referencing a table whose clustered index is disabled.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Errors of the Severity Level 15 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. The clustered index must be enabled before the constraint can be created.

Versions:
This error message was introduced with SQL Server 2005.

Example(s):
IF OBJECT_ID (‘dbo.T2′) IS NOT NULL
    DROP TABLE dbo.T2;
GO

IF OBJECT_ID (‘dbo.T1′) IS NOT NULL
    DROP TABLE dbo.T1;
GO

CREATE TABLE dbo.T1
(
    c1 int NOT NULL
    CONSTRAINT CX_t1 PRIMARY KEY
     

);

ALTER INDEX CX_t1 ON dbo.T1 DISABLE;

CREATE TABLE dbo.T2 (c1 int NOT NULL PRIMARY KEY
    CONSTRAINT FK_T2_T1 FOREIGN KEY REFERENCES dbo.T1 (c1));

Remarks:
In the abve example we try to create a foreign key constraint referencing dbo.T1. Because the clustered index of dbo.T1 is disabled, the error is raised.



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