Consider the following scenario:
- You create a linked server to access an instance of SQL Server 2008.
- You install SQL Server 2008 Service Pack 1 (SP1) to this instance of SQL Server 2008.
You run a query against a table that is located on the remote server by using the four-part name.
- This table contains a column name that contains a period character. For example, the column name is Column1.A.
In this scenario, when you run the query, you find that the column that contains a period character is missing from the results. Note
This issue also occurs in cumulative update package 1 for SQL Server 2008 SP1 and in cumulative update package 2 for SQL Server 2008 SP1. This issue does not occur if you are running the release version of SQL Server 2008.
This issue occurs because of a change that is introduced in SQL Server 2008 SP1. The change causes SQL Server to check permissions for all columns in the linked server query. However, if SQL Server 2008 SP1 is installed, the check is unsuccessful on columns that have the period character in the column name.
You must apply this hotfix on a linked server that is running SQL Server 2008 Service Pack 1 (SP1).
The fix for this issue was first released in Cumulative Update 3 for SQL Server 2008 Service Pack 1. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
Cumulative update package 3 for SQL Server 2008 Service Pack 1
Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release. Microsoft recommends that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
Microsoft SQL Server 2008 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2008 Service Pack 1 hotfix to an installation of SQL Server 2008 Service Pack 1. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.
To work around this issue, use one of the following methods:Method 1
Rewrite the query to use the OPENQUERY
function instead of the four-part name to retrieve data from the linked server.Method 2
Create a view to rename the problematic columns for the affected table that is located on the linked server. In the view, use a column name that does not contain a period character for the problematic column. For example, run a statement that resembles the following to create the view:
--On the linked server, run the following statements:
CREATE VIEW View1
SELECT [Column1.A] AS Column1_A, Column2 from Table1
--On the local server, run the following query:
SELECT Column1_A,Column2 FROM LinkedServer1.Database1.dbo.View1
Uninstall SQL Server 2008 Service Pack 1.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems
For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
New naming schema for Microsoft SQL Server software update packages
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates