c# qr code generator Inside Microsoft SQL Server 2008: T-SQL Querying in C#.NET

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Inside Microsoft SQL Server 2008: T-SQL Querying
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individual statement within a procedure/batch produces a trace event. Unless you really need to trace the individual statements, consider tracing at the procedure/batch level (for example, SP:Completed, SQL:BatchCompleted).
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Use the trace ltering capabilities to lter only the relevant events. For example, when tuning a particular database, make sure you lter events only for the relevant database ID.
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With these important guidelines in mind, let s proceed to the trace that we need for our tuning purposes.
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Trace Performance Workload
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You now need to de ne a trace that will help you identify processes that need to be tuned in the Performance database. When faced with such a need, DBAs tend to trace slow-running processes by ltering events where the Duration data column is greater than or equal to some value (say, 3,000 milliseconds). Though such a trace can be very interesting, it won t necessarily reveal all important queries that should be tuned. Think of the following: You have a query that runs for about 30 seconds a couple of times a day and another query that runs for a about half a second 40,000 times a day. Which would you say is more important to tune Obviously, the latter is more important, but if you lter only events that run for at least three seconds, you ll lter out the more important query to tune. In short, for our purposes you don t want to lter based on Duration at all. Of course, this means that you might get enormous amounts of trace data, so make sure you follow the guidelines I suggested earlier. You do want to lter only the databases that are relevant to your tuning process. As for event classes, if most activities in your system are invoked by stored procedures and each stored procedure invokes a small or limited number of activities, trace the SP:Completed event class. You will then be able to aggregate the data by the procedure. Similarly, if most of the activities are invoked by batches with a small number of activities, trace the SQL:BatchCompleted event class. However, if each procedure invokes many activities, you want to trace the SP:StmtCompleted event class to capture each individual statement invoked from each stored procedure. If you have activities that are submitted as ad-hoc batches (as in our case), trace the SQL:StmtCompleted event class. Remember, though, that tracing individual statement event classes can produce a lot of trace information and have an impact on the traced SQL Server instance. As much as possible, try to limit such tracing to short periods to collect a representative workload. Finally, if you have activities submitted as remote procedure calls, trace the RPC:Completed event class. Notice that all event classes are Completed ones as opposed to the respective Starting event classes. Only the Completed event classes carry performance information such as Duration, CPU, Reads, and Writes because, naturally, these values are unknown when the respective event starts. As for data columns, you mainly need the TextData column that will carry the actual T-SQL code and the relevant performance-related counters for example, the Duration column. Remember that users perceive waits as the performance problem, and Duration stands for
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Query Tuning
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the elapsed time it took the event to run. If you re speci cally targeting I/O-related problems, you may want to analyze the Reads and Writes columns. I also like to trace the RowCounts data column, especially when looking for network-related problems. Queries returning the result set to the client with large numbers in this counter would indicate potential pressure on the network. Other than that, you might want additional data columns based on your needs. For example, if you later want to analyze the data by host, application, login, and so on, make sure you also include the corresponding data columns. You can de ne a trace following these guidelines and then script its de nition to T-SQL code. I did so and encapsulated the code in a stored procedure called PerfworkloadTraceStart. The stored procedure accepts a database ID and le name as input parameters. It de nes a trace using the speci ed database ID as a lter and the given le name as the target for the trace data; it starts the trace and returns the newly generated trace ID via an output parameter. Run the following code to create the PerfworkloadTraceStart stored procedure:
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SET NOCOUNT ON; USE master; GO IF OBJECT_ID('dbo.PerfworkloadTraceStart', 'P') IS NOT NULL DROP PROC dbo.PerfworkloadTraceStart; GO CREATE PROC dbo.PerfworkloadTraceStart @dbid AS INT, @tracefile AS NVARCHAR(245), @traceid AS INT OUTPUT AS -- Create a Queue DECLARE @rc AS INT; DECLARE @maxfilesize AS BIGINT; SET @maxfilesize = 5; EXEC @rc = sp_trace_create @traceid OUTPUT, 0, @tracefile, @maxfilesize, NULL IF (@rc != 0) GOTO error; -- Set the events DECLARE @on AS BIT; SET @on = 1; -- RPC:Completed exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent exec sp_trace_setevent
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@traceid, @traceid, @traceid, @traceid, @traceid, @traceid, @traceid, @traceid, @traceid,
10, 10, 10, 10, 10, 10, 10, 10, 10,
15, @on; 8, @on; 16, @on; 48, @on; 1, @on; 17, @on; 10, @on; 18, @on; 11, @on;
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