Top SQL Server Solutions from Microsoft Supporthttp://support.microsoft.com/ph/14917The latest support information about SQL Server Solutions from Microsoft Product Support Services. Login failed for user 'username'. The user is not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452)http://support.microsoft.com/kb/555332#phrssSecurity and High AvailabilityDuring a logon process to SQL server the following error may appear: "Login failed for user 'username'. The user is not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452)". How to troubleshoot the "Cannot generate SSPI context" error messagehttp://support.microsoft.com/kb/811889#phrssSecurity and High AvailabilityThis step-by-step article describes how to troubleshoot the most typical sources of the "Cannot generate SSPI context" error message. You may receive this error message under the following conditions: a) You are connecting to SQL Server, b) You are using Integrated Security, or c) Kerberos is used to perform the security delegation. Troubleshooting Performance Problems in SQL Server 2008http://msdn.microsoft.com/en-us/library/dd672789(v=SQL.100).aspx#phrssPerformance - serverThis article can help administrators prevent or minimize problems with SQL Server performance. Introducing the SQL Server 2008 R2 Best Practices Analyzer (BPA)http://blogs.msdn.com/b/psssql/archive/2010/06/20/introducing-the-sql-server-2008-r2-best-practices-analyzer-bpa.aspx#phrssOtherUse the SQL Server 2008 R2 Best Practices Analyzer (BPA) to identify and resolve potential issues. Use System Center Advisor to proactively avoid configuration problemshttps://www.systemcenteradvisor.com/#phrssOtherSystem Center Advisor is a cloud service that enables you to assess your server configuration and proactively avoid problems. Additionally, System Center Advisor helps reduce downtime by providing suggestions for improvement, and notifying you of key updates specific to your configuration. How To: Optimize SQL Querieshttp://msdn.microsoft.com/en-us/library/ff650689.aspx#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query. Optimize SQL Server CPU Performancehttp://technet.microsoft.com/en-us/magazine/2007.10.sqlcpu.aspx#phrssPerformance - server Troubleshooting performance problems on a database system can be an overwhelming task. Knowing where to look for trouble is important, but more crucial is knowing why your system reacts the way that it does to a particular request. High CPU utilization may occur with your queries on SQL Server 2005 and SQL Sever 2008 servers compared to SQL Server 2000http://support.microsoft.com/kb/2009160#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query. Diagnosing and Troubleshooting SQL Server Performance Problemshttp://support.microsoft.com/kb/982870#phrssPerformance - serverThis article contains links to various other articles containing guidelines for diagnosing and troubleshooting common performance problems OS Errors 1450 and 665 are reported for database data fileshttp://support.microsoft.com/kb/2002606#phrssPerformance - serverThe sparse files created by SQL Server for the database snapshots can get too fragmented when large amounts of data modifications happen for the life of these snapshot files. The 'affinity mask' and 'affinity I/O mask' configuration should not conflicthttp://support.microsoft.com/kb/2157114#phrssPerformance - serverThis article explains why he 'affinity mask' and 'affinity I/O mask' configuration values of SQL Server should not conflict. Performance may suffer if you choose to affinitize a processor for both SQL Server worker thread scheduling and for I/O processing. SQL High CPU scenario troubleshooting http://blogs.msdn.com/b/sql_pfe_blog/archive/2009/07/17/sql-high-cpu-scenario-troubleshooting-using-sys-dm-exec-query-stats-and-ring-buffer-scheduler-monitor-ring-buffer-in-sys-dm-os-ring-buffers.aspx#phrssPerformance - serverSQL High CPU scenario troubleshooting using sys.dm_exec_query_stats and RING_BUFFER_SCHEDULER_MONITOR ring buffer in sys.dm_os_ring_buffers How to stop the transaction log of a SQL Server database from growing unexpectedlyhttp://support.microsoft.com/kb/873235#phrssPerformance - serverThis article describes the steps that you must follow when the transaction logs expand to an unacceptable limit. Various errors may occur when you try to install SQL Server 2008 R2http://support.microsoft.com/kb/2449398#phrssStand-alone - Setup or upgradeMicrosoft Knowledge Base article 2449398 descirbes common error messages that can occur during installation and provides steps to correct some issues. "SQL Server 2008 Setup requires Microsoft .NET Framework 4.0 to be installed" error message when you apply Service Pack 2 (SP2) for SQL Server 2008http://support.microsoft.com/kb/2500042#phrssStand-alone - Setup or upgrade SQL Server 2005 setup fails when MSXML Core Services 6.0 Service Pack 2 has already been installedhttp://support.microsoft.com/kb/968749#phrssStand-alone - Setup or upgradeMicrosoft SQL Server 2005 installation fails on a Windows XP computer that has MSXML Security Update MS08-069 and Windows XP Service Pack 3 installed. This article provides guidance for solving this issue. How to uninstall an instance of SQL Server 2005 manuallyhttp://support.microsoft.com/kb/909967#phrssStand-alone - Setup or upgradeThis article describes how to uninstall a stand-alone instance of Microsoft SQL Server 2005 manually. How to troubleshoot SQL Server 2008 Setup issueshttp://support.microsoft.com/kb/955396#phrssStand-alone - Setup or upgradeThis article describes how to troubleshoot issues installing Microsoft SQL Server 2008 by using SQL Server 2008 log files. Query performance is slow when you run a query that contains an ORDER BY clause on a table column of an SQL tertiary collationhttp://support.microsoft.com/kb/951935#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query. Performance is slow when you run a query in SQL Server 2005 that updates a table on a linked server and then joins the table to a table on the local serverhttp://support.microsoft.com/kb/942982#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query., You may notice performance issues when using date literal values in distributed queries with third party OLEDB providers from SQL serverhttp://support.microsoft.com/kb/2000395#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query. Query performance decreases when sys.dm_db_index_usage_stats has large number of rowshttp://support.microsoft.com/kb/2003031#phrssPerformance - specific queryOne of a series of KB articles on troubleshooting performance issues caused by a specific query. Various errors may occur when you try to install SQL Server 2008 R2http://support.microsoft.com/kb/2449398#phrssSetupWhen you try to install SQL Server 2008 R2, you may see one or more error messages or symptoms, preventing you from proceeding with the setup. Many times these are caused by damaged or corrupted installation media/files. This article documents the list of error messages and recommends solutions for these errors. How to configure SQL Server 2005 to allow remote connectionshttp://support.microsoft.com/kb/914277#phrssData Access - ConnectivityWhen you try to connect to an instance of Microsoft SQL Server 2005 from a remote computer, you may receive an error message. This error could be displayed from several different programs, if they are program to connect to SQL Server.