Applies ToSQL Server 2008 R2 Datacenter SQL Server 2008 R2 Developer SQL Server 2008 R2 Enterprise SQL Server 2008 R2 Express SQL Server 2008 R2 Express with Advanced Services SQL Server 2008 R2 Standard SQL Server 2008 R2 Standard Edition for Small Business SQL Server 2008 R2 Web SQL Server 2008 R2 Workgroup SQL Server 2012 Business Intelligence SQL Server 2012 Developer SQL Server 2012 Enterprise SQL Server 2012 Standard SQL Server 2012 Web SQL Server 2012 Enterprise Core

Microsoft distributes Microsoft SQL Server 2008 R2 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 R2 fix release.

Symptoms

When you run a SELECT statement that contains a LIKE operator and an ESCAPE clause in SQL Server 2008 R2 or in SQL Server 2012, SQL Server may use an inefficient query plan for the statement. Additionally, the performance of the statement is low.

Cause

This issue occurs because the number of rows that is estimated for the SELECT statement is much larger than the actual number of rows.

Resolution

Cumulative update information

Cumulative update package 1 for SQL Server 2012 Service Pack 1

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 2012 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:

2765331 Cumulative update package 1 for SQL Server 2012 Service Pack 1Note 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 2012 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:

2772858 The SQL Server 2012 builds that were released after SQL Server 2012 Service Pack 1 was released

SQL Server 2012

The fix for this issue was first released in Cumulative Update 3 for SQL Server 2012. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:

2723749 Cumulative update package 3 for SQL Server 2012Note 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 2012 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:

2692828 The SQL Server 2012 builds that were released after SQL Server 2012 was released You must apply a SQL Server 2012 hotfix to an installation of SQL Server 2012.

SQL Server 2008 R2 Service Pack 2

The fix for this issue was first released in Cumulative Update 1 for SQL Server 2008 R2 Service Pack 2. For more information about how to obtain this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:

2720425 Cumulative Update package 1 for SQL Server 2008 R2 Service Pack 2Note 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 R2 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:

2730301 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 2 was released

SQL Server 2008 R2

The fix for this issue was first released in Cumulative Update 6. For more information about how to obtain this cumulative update package for SQL Server 2008 R2, click the following article number to view the article in the Microsoft Knowledge Base:

2679367 Cumulative Update package 6 for SQL Server 2008 R2 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 R2 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:

981356 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 was releasedNote To enable this the fix of this issue, enable Trace Flag 4199.

Status

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

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