SQL Server Performance SQL Server Performance Audit and TuningAudit and Tuning

Jason PackJason Pack

OverviewOverview

Using Performance MonitorUsing Performance Monitor Hardware and Operating System Hardware and Operating System

PerformancePerformance SQL Server Configuration SettingsSQL Server Configuration Settings Database Configuration SettingsDatabase Configuration Settings Index Performance TuningIndex Performance Tuning Application TuningApplication Tuning SQL Profiler on QueriesSQL Profiler on Queries

Performance MonitorPerformance Monitor

Performance Monitor (2)Performance Monitor (2)

Typical counters to monitor:Typical counters to monitor:

• Pages per second (memory)Pages per second (memory) Want to average less than 20Want to average less than 20

• Available bytes (memory)Available bytes (memory) Should be over 5MB (on dedicated machine)Should be over 5MB (on dedicated machine)

• Percent disk time (physical disk)Percent disk time (physical disk) Over 55% for 10+ minutes indicates a bottleneckOver 55% for 10+ minutes indicates a bottleneck

• Percent processor timePercent processor time Over 80% for 10+ minutes indicates a bottleneckOver 80% for 10+ minutes indicates a bottleneck

Tuning Hardware and Operating Tuning Hardware and Operating System PerformanceSystem Performance

More RAM = GoodMore RAM = Good Check disk fragmentationCheck disk fragmentation Separate operating system files and Separate operating system files and

SQL Server data filesSQL Server data files Be sure OS has newest SPBe sure OS has newest SP Server should be configured as Server should be configured as

stand-alone serverstand-alone server Turn off unnecessary servicesTurn off unnecessary services

SQL Server Configuration SettingsSQL Server Configuration Settings

In general, no need to modifyIn general, no need to modify If you have toIf you have to

• SP_CONFIGURE, will show your settingsSP_CONFIGURE, will show your settings• SP_CONFIGURE ['SP_CONFIGURE ['configuration nameconfiguration name'], '],

[[configuration setting valueconfiguration setting value]]GOGORECONFIGURE WITH OVERRIDERECONFIGURE WITH OVERRIDEGO, to change the settingsGO, to change the settings

Database ConfigurationDatabase Configuration

Right-click the Right-click the database in database in Enterprise Enterprise Manager, select Manager, select Properties, then Properties, then OptionsOptions

Database Configuration (2)Database Configuration (2)

For reporting databases, set to Read-For reporting databases, set to Read-onlyonly

Database auto-growDatabase auto-grow

Transaction log auto-growTransaction log auto-grow• Estimate well, auto-grow creates virtual Estimate well, auto-grow creates virtual

files, increasing recovery timefiles, increasing recovery time

Index Performance TuningIndex Performance Tuning

Run the Index Tuning WizardRun the Index Tuning Wizard• Only available in Enterprise editionOnly available in Enterprise edition

Start with busiest database, and Start with busiest database, and largest tableslargest tables

Every table, in every database, Every table, in every database, should have a clustered index on the should have a clustered index on the PKPK• Allows the data to be stored, physically, Allows the data to be stored, physically,

in orderin order

Application TuningApplication Tuning

Most important aspect in improving Most important aspect in improving performanceperformance

Not always possibleNot always possible

Application Tuning (2)Application Tuning (2)

Use stored procedures whenever possibleUse stored procedures whenever possible• Include SET NOCOUNT ON in stored procedureInclude SET NOCOUNT ON in stored procedure

Keep transactions as short as possibleKeep transactions as short as possible Choose OLE DB over ODBC, as it is Choose OLE DB over ODBC, as it is

generally fastergenerally faster Don’t return more data than you needDon’t return more data than you need

SQL ProfilerSQL Profiler

EventsEvents• Stored ProceduresStored Procedures

RPC:CompletedRPC:Completed

• TSQLTSQL SQL:BatchCompletedSQL:BatchCompleted

FiltersFilters• Duration > 5000 msDuration > 5000 ms• No system eventsNo system events

Data ColumnsData Columns• Duration (group by)Duration (group by)• Event ClassEvent Class• Database IdentifierDatabase Identifier• TextDataTextData• CPUCPU• WritesWrites• ReadsReads• SPIDSPID

SQL Profiler (2)SQL Profiler (2)

ReferencesReferences

SQL-Server-Performance.Com, Brad McGehee, February 2005SQL-Server-Performance.Com, Brad McGehee, February 2005• http://www.sql-server-performance.com/sql_server_performance_audit10.asphttp://www.sql-server-performance.com/sql_server_performance_audit10.asp

Microsoft MSDN, Meier, J. D., Vasireddy, S., Babbar, A., et al., May Microsoft MSDN, Meier, J. D., Vasireddy, S., Babbar, A., et al., May 20042004• http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag/html/scalhttp://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag/html/scal

enetchapt14.aspenetchapt14.asp

SQL-Server-Performance.Com, Geert Vanhove, June 2005SQL-Server-Performance.Com, Geert Vanhove, June 2005• http://www.sql-server-performance.com/gv_monitoring_8_steps.asphttp://www.sql-server-performance.com/gv_monitoring_8_steps.asp

Microsoft MSDNMicrosoft MSDN • http://msdn.microsoft.com/library/default.asp?url=/library/en-us/createdb/cm_8_http://msdn.microsoft.com/library/default.asp?url=/library/en-us/createdb/cm_8_

des_05_2ri0.aspdes_05_2ri0.asp