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Asked: 2026-05-13T13:58:32+00:00

I have already asked a question about this, but the problems keeps on hitting

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I have already asked a question about this, but the problems keeps on hitting me 😉

I have two tables that are identical. I want to add a xml column. In the first table this is no problem, but in the second table I get the sqlException (title). However, apart from the data in it, they are the same. So, can I get the sqlException because of data in the table?

I have also tried to store the field off page with 

EXEC sp_tableoption 'dbo.PackageSessionNodesFinished', 
  'large value types out of row', 1

but without any succes. The same SqlException keeps coming.

First table: PackageSessionNodes

CREATE TABLE [dbo].[PackageSessionNodes](
    [PackageSessionNodeId] [int] IDENTITY(1,1) NOT NULL,
    [PackageSessionId] [int] NOT NULL,
    [TreeNodeId] [int] NOT NULL,
    [Duration] [int] NULL,
    [Score] [float] NOT NULL,
    [ScoreMax] [float] NOT NULL,
    [Interactions] [xml] NOT NULL,
    [BrainTeaser] [bit] NULL,
    [DateCreated] [datetime] NULL,
    [CompletionStatus] [int] NOT NULL,
    [ReducedScore] [float] NOT NULL,
    [ReducedScoreMax] [float] NOT NULL,
    [ContentInteractions] [xml] NOT NULL,
 CONSTRAINT [PK_PackageSessionNodes] PRIMARY KEY CLUSTERED 
(
    [PackageSessionNodeId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, 
ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

Second table: PackageSessionNodesFinished

CREATE TABLE [dbo].[PackageSessionNodesFinished](
    [PackageSessionNodeFinishedId] [int] IDENTITY(1,1) NOT NULL,
    [PackageSessionId] [int] NOT NULL,
    [TreeNodeId] [int] NOT NULL,
    [Duration] [int] NULL,
    [Score] [float] NOT NULL,
    [ScoreMax] [float] NOT NULL,
    [Interactions] [xml] NOT NULL,
    [BrainTeaser] [bit] NULL,
    [DateCreated] [datetime] NULL,
    [CompletionStatus] [int] NOT NULL,
    [ReducedScore] [float] NOT NULL,
    [ReducedScoreMax] [float] NOT NULL,
    [ContentInteractions] [xml] NULL,
 CONSTRAINT [PK_PackageSessionNodesFinished] PRIMARY KEY CLUSTERED 
(
    [PackageSessionNodeFinishedId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, 
ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

First script I tried to run (First two ALTER TABLE work fine, the third crashes on SqlException)

ALTER TABLE dbo.PackageSessionNodes ADD
    ContentInteractions xml NOT NULL CONSTRAINT 
    DF_PackageSessionNodes_ContentInteractions 
    DEFAULT (('<contentinteractions/>'));

ALTER TABLE dbo.PackageSessionNodes
    DROP CONSTRAINT DF_PackageSessionNodes_ContentInteractions

ALTER TABLE dbo.PackageSessionNodesFinished ADD
    ContentInteractions xml NOT NULL CONSTRAINT 
    DF_PackageSessionNodesFinished_ContentInteractions 
    DEFAULT (('<contentinteractions/>'));

ALTER TABLE dbo.PackageSessionNodesFinished
    DROP CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions

Second script I tried to run with the same result as previous script:

EXEC sp_tableoption 'dbo.PackageSessionNodes', 
    'large value types out of row', 1

ALTER TABLE dbo.PackageSessionNodes ADD
    ContentInteractions xml NOT NULL CONSTRAINT
    DF_PackageSessionNodes_ContentInteractions 
    DEFAULT (('<contentinteractions/>'));

ALTER TABLE dbo.PackageSessionNodes
    DROP CONSTRAINT DF_PackageSessionNodes_ContentInteractions

EXEC sp_tableoption 'dbo.PackageSessionNodesFinished', 
    'large value types out of row', 1

ALTER TABLE dbo.PackageSessionNodesFinished ADD
    ContentInteractions xml NOT NULL CONSTRAINT 
    DF_PackageSessionNodesFinished_ContentInteractions 
    DEFAULT (('<contentinteractions/>'));

ALTER TABLE dbo.PackageSessionNodesFinished
    DROP CONSTRAINT DF_PackageSessionNodesFinished_ContentInteractions

Now, In PackageSessionNodes there are 234 records, in PackageSessionNodesFinished there are 4256946 records.

Really would appreciate some help here as I’m stuck.

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1 Answer

  1. Editorial Team

    Try emptying your table first, make your change, then put the data back in again. It sounds like there is a row which is storing its existing data in the row, and adding the new column is just over its limit. If you take the data out, make the change, and then put it back again, it ought to store the xml out-of-row instead.

    Unfortunately, it won’t move data out of a row when you make this type if change. It’s a very rare situation, you’re unlucky.

    Edit: also, you could try rebuilding your clustered index after you have set the table option, so that all the XML will be forced out of row. You could also do some maths and some calculating row lengths, to work out which row(s) are causing the problem. Then you could move that data temporarily.

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