2

Okay so I've been condensing files off of some tiny files and moving them onto an FG that I created for these miscellaneous tables. I've been moving these tables by recreating the indexes with the WITH (DROP_EXISTING = ON) option and it's been working great. However this last time it gave me an error. Here's the script I'm running

CREATE Unique CLUSTERED INDEX PK_MyTable 
    ON dbo.MyTable (MyTableID, RowStatus)  
    WITH (DROP_EXISTING = ON)  
    ON FG_Misc; 

When I run this I get the following error message.

Msg 1902, Level 16, State 3, Line 1

Cannot create more than one clustered index on table 'dbo.MyTable'. Drop the existing clustered index PK_MyTable' before creating another.

I don't see any reason why this is throwing this error on this particular table but not any others I've been working on.

3

This can happen when the current primary key is nonclustered, and there is also a clustered index:

CREATE TABLE dbo.MyTable
(
    MyTableID integer NOT NULL,
    RowStatus tinyint NOT NULL,
    SomeOtherKey integer,

    CONSTRAINT [PK_MyTable]
        PRIMARY KEY NONCLUSTERED (MyTableID, RowStatus),

    CONSTRAINT [CUQ_MyTable]
        UNIQUE CLUSTERED (SomeOtherKey)
);
CREATE Unique CLUSTERED INDEX PK_MyTable 
    ON dbo.MyTable (MyTableID, RowStatus)  
    WITH (DROP_EXISTING = ON);

Msg 1902, Level 16, State 3, Line 14
Cannot create more than one clustered index on table 'dbo.MyTable'. Drop the existing clustered index 'CUQ_MyTable' before creating another.

It is valid to change a primary key from nonclustered to clustered using DROP_EXISTING syntax:

CREATE TABLE dbo.MyTable
(
    MyTableID integer NOT NULL,
    RowStatus tinyint NOT NULL,
    SomeOtherKey integer,

    CONSTRAINT [PK_MyTable]
        PRIMARY KEY NONCLUSTERED (MyTableID, RowStatus),
);

CREATE Unique CLUSTERED INDEX PK_MyTable 
    ON dbo.MyTable (MyTableID, RowStatus)  
    WITH (DROP_EXISTING = ON); 
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