FIX: Event ID 7904 is logged, and the SQL Server 2008 database is corrupted when you restore a SQL Server 2008 database from a sequence of transaction log backups

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Article ID: 957809 - View products that this article applies to.
Bug #: 50003452 (SQL Hotfix)
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

When you restore a Microsoft SQL Server 2008 database from a sequence of transaction log backups, the SQL Server 2008 database is corrupted. However, the original SQL Server 2008 database from which you backed up the transaction logs is not corrupted. When this issue occurs, the following event is logged:

Filestream corruption - missing files, error 7904.

The corruption is detected on a database that was restored from a sequence of backup logs. The original database does not seem to be corrupted.

7904 16 2

Table error: The filestream file for "FileID" was not found.

CAUSE

This issue occurs because a race condition occurs between skipped files that should be backed up by a later transaction log backup.

When a file is in an active transaction, a log sequence number is assigned to the file in the createLSN column. The log sequence number in the createLSN column is less than the log sequence number in the lastLSN column of the transaction log backup. However, the FSLOG entry is not recorded in the $FSLOG folder in time for the file to be marked “skipped” by the current transaction log backup. A later transaction log backup process does not back up the skipped file. Therefore, a broken log chain occurs.

RESOLUTION

The fix for this issue was first released in Cumulative Update 1. 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:
956717 Cumulative update package 1 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

STATUS

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

MORE INFORMATION

For more information about what files are changed, and for information about any prerequisites to apply the cumulative update package that contains the hotfix that is described in this Microsoft Knowledge Base article, click the following article number to view the article in the Microsoft Knowledge Base:
956717 Cumulative update package 1 for SQL Server 2008

REFERENCES

For more information about the list of builds that are available after the release of SQL Server 2008, 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
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: 957809 - Last Review: September 19, 2008 - Revision: 1.0
APPLIES TO
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Workgroup
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