FIX: UPDATE Statement on a Clustered Index Key Fails with Error 547

This article was previously published under Q280747
This article has been archived. It is offered "as is" and will no longer be updated.
BUG #: 58158 (SQLBUG_70)
BUG #: 234633 (SQLBUG_2000)
SYMPTOMS
When you attempt to update a clustered index key, you may receive the following error message even though no constraints are violated:
Server: Msg 547, Level 16, State 1, Line 1
UPDATE statement conflicted with TABLE CHECK constraint 'CK_tblA'. The
conflict occurred in database 'pubs', table 'tblA'.
The statement has been terminated.
The above error occurs if all of the following conditions are true:
  • The table in question contains a composite clustered index.
  • Updates are made to one of the clustered index keys.
  • The table contains a unique nonclustered index on one of the clustered index keys.
  • The table has a CHECK constraint that checks for null values on any of the clustered index keys.
RESOLUTION

SQL Server 2000

To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack

SQL Server 7.0

To resolve this problem, obtain the latest service pack for SQL Server 7.0. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
301511 INF: How to Obtain the Latest SQL Server 7.0 Service Pack
WORKAROUND
To avoid this problem, change the composite clustered index to a nonclustered index.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

SQL Server 2000

This problem was first corrected in SQL Server 2000 Service Pack 1.

SQL Server 7.0

This problem was first corrected in SQL Server 7.0 Service Pack 3.
MORE INFORMATION
To reproduce the problem, run the following code:
USE PUBSGOCREATE TABLE [tblA] (	[col0] [int] IDENTITY (1, 1) not NULL ,	[col1] [varchar] (10)   NULL,	[col2] [varchar] (10)  NULL,	[col3] [smallint] NULL ,		CONSTRAINT [CK_tblA]	CHECK ((([col1] is null) and ([col2] is null))		or (([col1] is not null) and ([col2] is not null))))GOCREATE  CLUSTERED  INDEX [IXCL_tblA] ON [dbo].[tblA]([col0], [col1]) GOcreate unique nonclustered  index [IXNCL_tblA] ON [dbo].[tblA]([col0])goinsert into tblA ([col1], [col2], [col3])values ('AAA', 'BBB', 1)update tblAset col1='DDD'				
violation
Properties

Article ID: 280747 - Last Review: 01/16/2015 21:11:58 - Revision: 3.2

  • Microsoft SQL Server 7.0 Standard Edition
  • Microsoft SQL Server 2000 Standard Edition
  • kbnosurvey kbarchive kbbug kbfix kbsqlserv2000sp1fix KB280747
Feedback