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2. Identifying Performance Problems with SQL Profiler Martin Bell SQL Server MVP

3. Introduction  SQL Profiler is the most important tool for diagnosing poorly performing SQL in a system  SQL 2005 has improved SQL Profiler to make it even more useful  Combined with other tools you can build a complete performance monitoring toolkit

4. Perfmon Counters  New counters covers areas including CLR information, Service Broker, Notification Services  sys.dm_os_performance_counters and sys.sysperfinfo  Import perfmon data into SQL Profiler

8. Server Dashboard  Perfmon reports release with SP1  Performance at a glance, based on dynamic views –sys.dm_os_performance_counters –sys.dm_exec_query_stats

12. Performance Dashboard Custom Reports  Download from  Download from http://www.microsoft.com/downloads/details.aspx? FamilyId=1D3A4A0D-7E0C-4730-8204- E419218C1EFC&displaylang=en  Requires SP2  Common performance problems that the dashboard reports may help to resolve include: - CPU bottlenecks (and what queries are consuming the most CPU) - IO bottlenecks (and what queries are performing the most IO). - Index recommendations generated by the query optimizer (missing indexes) - Blocking - Latch contention

17. SQL Profiler  Improved interface for creating a profile  Added filtering capability  Deadlock Graphs  Showplan XML  Re-configure trace without loosing data  Include Perfmon Data

21. Deadlock Graphs  Better detection of deadlocks  No need for blocker scripts or other methods  Easily identify blocking problems

24. -- Script 1 USE PUBS GO SELECT @@SPID AS [Windows 1 SPID] GO BEGIN TRANSACTION SELECT * FROM AUTHORS WITH (UPDLOCK) -- Results Returned immediately WAITFOR DELAY '000:00:03' SELECT * FROM TITLES WITH (UPDLOCK) -- Results Returned immediately ROLLBACK TRANSACTION GO

25. -- Script 2 USE PUBS GO SELECT @@SPID AS [Windows 2 SPID] GO BEGIN TRANSACTION SELECT * FROM TITLES WITH (UPDLOCK) -- Results Returned immediately WAITFOR DELAY '000:00:03' SELECT * FROM AUTHORS WITH (UPDLOCK) -- Results Not Returned Immediately ROLLBACK TRANSACTION GO

26. Msg 1205, Level 13, State 51, Line 8 Transaction (Process ID 57) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.

29. Define Profiler Templates  Save your own templates if you frequently require to profile certain events/columns

35. Changing Events without loosing Data  Unlike SQL 2000 you can pause the SQL profile, change what is being logged and then resume the profile without loosing the previous data

36. XML Showplan  This will help to diagnose query problems, less need to cut/paste into Management Studio  Maintain old query plans and able to compare current plans to older ones

41. Importing Perfmon Data  If you have collected perfmon counters while a trace is running they can be imported into the SQL profiler  Better collect statement level information –sp:StatementStart –sp:StatementComplete  Do not trace a high number of events for a long period or you may fill up the file system!

45. Clicking a row on the SQL Trace output will move to the corresponding time in the Perfmon data

46. Dragging an area on the Perfmon data will zoom in

48. Gotchas  Using SQL Profiler on database server can take resources  Uses temp directory to storage – make sure this is not on the system disc!

49. Server Side Traces  Script from SQL Profiler  Schedule from SQL Agent  Specify a duration  Automate the collection and analysis  Output to a file on different spindles!

52. Running traces  Use fn_trace_setstatus for the given trace id to change the status –0 stops the trace –1starts the trace –2closes the trace

53. Show running traces  Use fn_trace_getinfo to return information on the traces loaded and running. Property column: –1Trace options.  2 – Trace file rolls over  4 – Shutdown trace on error  8 – Produce a Blackbox trace –2File name –3Max size –4Stop time –5Current trace status

55. If you wish to load your own traces into SQL Profiler has the option to save a loaded trace file as a trace table, or you can use the function fn_trace_gettable e.g. SELECT IDENTITY(bigint, 1, 1) AS RowNumber, * INTO dbo.trc_20061206_1 FROM ::fn_trace_gettable('c:\trc_20061206_1.trc', default) Loading your own traces

56. Analysing the results  Read80Trace (SQL Server 2000)  Manual Loading and Analysis  ClearTrace utility

57. Manual Analysis SELECT LEFT(CAST(TextData AS VARCHAR(8000)),25) AS [Procedure], COUNT(*) AS [Number of Calls], SUM([Duration]) AS [Total Duration], AVG([Duration]) AS [Average Duration], SUM([Reads]) AS [Total Reads], AVG([Reads]) AS [Average Reads], SUM([Writes]) AS [Total Write], AVG([Writes]) AS [Average Write], SUM([CPU]) AS [Total CPU], AVG([CPU]) AS [Average CPU] FROM dbo.trc_200612031629 GROUP BY LEFT(CAST(TextData AS VARCHAR(8000)),25) ORDER BY SUM([Duration]) DESC

58. Procedure Analysis CREATE VIEW dbo.vw_trc_200612031629 AS SELECT LEFT(SUBSTRING(CAST(textdata as VARCHAR(8000)), CHARINDEX('usp', CAST(textdata as VARCHAR(8000)) ), CASE WHEN CHARINDEX(' ',CAST(textdata as VARCHAR(8000)), CHARINDEX(‘usp', CAST(textdata as VARCHAR(8000)) ) ) > 0 THEN CHARINDEX(' ',CAST(textdata as VARCHAR(8000)), CHARINDEX(‘usp', CAST(textdata as VARCHAR(8000)) ) ) - CHARINDEX(‘usp', CAST(textdata as VARCHAR(8000)) ) ELSE LEN(CAST(textdata as VARCHAR(8000))) END ),60) as [Procedure], [Duration],[Reads],[Writes],[CPU] FROM dbo.trc_200612031629 WHERE CHARINDEX(‘usp', CAST(textdata as VARCHAR(8000))) > 0

59. Procedure Analysis SELECT [Procedure], COUNT(*) AS [Number of Calls], SUM([Duration]) AS [Total Duration], AVG([Duration]) AS [Average Duration], SUM([Reads]) AS [Total Reads], AVG([Reads]) AS [Average Reads], SUM([Writes]) AS [Total Write], AVG([Writes]) AS [Average Write], SUM([CPU]) AS [Total CPU], AVG([CPU]) AS [Average CPU] FROM dbo.vw_trc_200612031629 GROUP BY [Procedure] ORDER BY SUM([Duration]) DESC

60. Cleaning Data   You may also want to clean up the data, this is usually easier if you are using stored procedure as you should not need to use sp_prepare   Andrew Zanevsky wrote an interesting article on Trace Scrubbing article from SQL Server Professional in SQL Server Professional magazine http://msdn.microsoft.com/library/default.asp?url=/l ibrary/en-us/dnsqlpro04/html/sp04j1.asp

61. ClearTrace  Written by SQL Server MVP - Bill Graziano  Download from: http://www.cleardata.biz/cleartrace/downloa d.aspx

66. Replaying Traces  This can be very useful if you do not have the facilities to use a tool such as Visual Team Test or you only want to stress the database and not the GUI  Use standard Replay Template  Replay from file or table (but can not load file using fn_trace_gettable  Can manipulate trace data in table and export it

67. Limitations of Replaying Traces  Not imitating users therefore stress is different to live system  May not replay correctly (see considerations for replay in Books Online)

68. Visual Studio Team Suite  Unit and Load test Web applications  Simulate multiple users  Programmable to cater for runtime different etc

73. Microsoft Fiddler  Debugging Proxy  Save as Visual Studio WebTest  Download from www.fiddlertool.com

76. Database Engine Tuning Advisor  Replaces Index Tuning Wizard  Can tune more than one database  Advises on Partitioning

81. Resources  Profiling for Better Performance by Kimberly Tripp, MSDN webcast at  Profiling for Better Performance by Kimberly Tripp, MSDN webcast at http://msevents.microsoft.com/cui/webcasteventdetails.asp x?eventid=1032278616&eventcategory=5&culture=en- us&countrycode=us  MSDN Webcasts  MSDN Webcasts http://msdn.microsoft.com/webcasts  Using Visual Studio 2005 to Perform Load Testing on a SQL Server 2005 Reporting Services Report Server  Using Visual Studio 2005 to Perform Load Testing on a SQL Server 2005 Reporting Services Report Server http://msdn2.microsoft.com/en-us/library/aa964139.aspx  Using SQL Server 2005 Profiler Brian Knight http://www.jumpstarttv.com/Media.aspx?vid=59   SQL Server Manageability Team Blog http://blogs.msdn.com/sqlrem/default.aspx

82. Resources  Troubleshooting Performance Problems in SQL Server 2005 document  Troubleshooting Performance Problems in SQL Server 2005 document http://www.microsoft.com/prodtechnol/sql/2005/tsp rfprb.mspx http://www.microsoft.com/prodtechnol/sql/2005/tsp rfprb.mspx  Jasper Smith MVP - 1 Hour Trace  Jasper Smith MVP - 1 Hour Trace http://www.sqldbatips.com/displaycode.asp?ID=7   Simon Sabine’s Taskpad Custom Report http://sqlblogcasts.com/blogs/simons/archive/2007 /03/28/Update-to-the-taskpad-custom-report.aspx   Aaron Bertrand’s Show Blocking Custom Report http://sqlblog.com/blogs/aaron_bertrand/archive/2 006/12/19/448.aspx

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