Microsoft KB Archive/297209

= FIX: Deletes, Updates and Rank Based Selects May Cause Deadlock of MSSEARCH =

Article ID: 297209

Article Last Modified on 10/7/2005

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition

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This article was previously published under Q297209



BUG #: 31550 (PKM/SQL 2000)

Bug #: 353731 (SHILOH_BUGS)



SYMPTOMS
SQL Server 2000 uses the MSSEARCH service to provide full text query functionality.

A catalog can hold one or more indexes. The MSSEARCH service can perform insert, update and delete operations (population) at the same time that SQL Server is performing select operations against the catalog. When a catalog encounters inserts, updates and rank based select queries on similar key values, a deadlock may occur.

Queries against the catalog stop responding (hang) indefinitely and may create a condition where all SQL Server worker threads are blocking on MSSEARCH queries and the SQL Server appears to stop responding.



CAUSE
An undetected deadlock condition when a crawl is updating, deleting or inserting records in the catalog while rank based queries are executing.



RESOLUTION
SQL Server 2000

To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next SQL Server service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:   File name     Platform --

s80287i.exe  INTEL NOTE: Due to file dependencies, the most recent hotfix or feature that contains the preceding files may also contain additional files.



WORKAROUND
Avoid full text queries while catalog population is in progress.



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



MORE INFORMATION
SQL Server 2000 contains features for Full Text Change Notification and the CONTAINSTABLE query syntax. When the catalog population or query is running and the notifications result in deletes and inserts on similar keys while the rank based select queries are traversing the Tquery.dll, MSSEARCH may encounter the deadlock condition.

Keywords: kbbug kbfix kbqfe KB297209

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