FIX: After you merge the partitions of a table that have the data compression option enabled, and then re-partition the table, the data compression option is disabled on one of the table partitions in SQL Server 2008

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Article ID: 974262 - View products that this article applies to.
Microsoft distributes Microsoft SQL Server 2008 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release.
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SYMPTOMS

Consider the following scenario:
  • You use a partition function to split a table into two partitions in Microsoft SQL Server 2008.
  • The Data Compression option is enabled for the table partitions.
  • You merge the two partitions into a single partition.
  • You perform one of the following operations to invalidate the cache of the table metadata:
    • You run the DBCC FREESYSTEMCACHE('ALL') statement.
    • You roll back a DDL operation on the table.
  • You use the partition function to split the table into two partitions again.
In this scenario, the data compression option is disabled for the new table partition. You can run the following statement to obtain the data compression option for the table partitions:
SELECT OBJECT_NAME(object_id), index_id, partition_number, rows, data_compression_desc
FROM sys.partitions
WHERE object_id = object_id('<obj_id>')
ORDER BY partition_number
Note <obj_ID> represents the object ID of the table.

Additionally, if you switch the new table partition that has the data compression option disabled to a clone table that has the data compression option enabled, you receive the following error message:
Msg 11406, Level 16, State 1, Line 12
ALTER TABLE SWITCH statement failed. Source and target partitions have different values for the DATA_COMPRESSION option.

CAUSE

When you merge table partitions that have the data compression option enabled, the SQL Server database engine does not update the metadata of the data compression setting for the table.
Note The metadata of the data compression setting is stored on disk.

At the same time, the cache of the table metadata contains the correct metadata of the data compression setting for the table. When the cache of the table metadata is invalidated, the cache of the table metadata is populated by the metadata of the data compression setting for the table from disk. Because the metadata of the data compression setting for the table that is stored on disk is incorrect, the problem that is described in the "Symptoms" section occurs.

RESOLUTION

SQL Server 2008

Important You must use this fix if you are running the release version of Microsoft SQL Server 2008.

The fix for this issue was first released in Cumulative Update 7. For more information about how to obtain this cumulative update package for SQL Server 2008, click the following article number to view the article in the Microsoft Knowledge Base:
973601 Cumulative update package 7 for SQL Server 2008
Note 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. We recommend 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:
956909 The SQL Server 2008 builds that were released after SQL Server 2008 was released

SQL Server 2008 Service Pack 1

Important You must use this fix if you are running SQL Server 2008 Service Pack 1.

The fix for this issue was first released in Cumulative Update 4 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:
973602 Cumulative update package 4 for SQL Server 2008 Service Pack 1
Note 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:
970365 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.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

REFERENCES

For more information about how to switch a table partition, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn.microsoft.com/en-us/library/ms190273.aspx
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:
935897 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:
822499 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:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 974262 - Last Review: September 21, 2009 - Revision: 1.1
APPLIES TO
  • Microsoft SQL Server 2008 Workgroup
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Enterprise
Keywords: 
kbsurveynew kbexpertiseadvanced kbqfe kbfix KB974262

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