If you have a database server that hosts Sharepoint databases, and if you run Sharepoint or MOSS you do, I hope you have checked out the database maintenance whitepaper that Bill Baer released last week.
It provides a stored procedure that can be run to update your indexing and statistics while maintaining support from Microsoft, and not breaking your search services. For further information about previous problems see:
Information about the Maintenance Plan Wizard in SQL Server 2005 and about tasks that administrators can perform against SharePoint Databases
4 days ago