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14.2.4 RML utilities
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For many years, Microsoft Product Support Services (PSS) used a collection of private tools for assisting in the diagnosis and resolution of customer support issues. Now known as the replay markup language (RML) utilities, PSS released them to the general public in 2004. Available as a free download from the Microsoft website, the RML utilities, comprising ReadTrace, Reporter, and OStress, are used both for diagnosing performance problems and constructing stress-test scenarios.
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SQL Server Profiler
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AND REPORTER When we defined our Profiler trace earlier in figure 14.5, we chose to save the results to a database table. Doing so allows the results of the trace to be examined in a variety of ways once the trace is closed. For example, we could run the following query against the specified table to determine the top 10 expensive queries from a diskusage perspective:
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READTRACE
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-- Top 10 most expensive queries from a disk usage perspective SELECT TOP 10 TextData, CPU, (Reads + Writes) as DiskTotal, Duration FROM dbo.[Workload Analysis] ORDER BY DiskTotal DESC
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Queries such as the above are among the many possible ways in which the results can be analyzed. Further, as we saw in chapter 13, we can use the saved results as input for the Database Engine Tuning Advisor, which will analyze the trace contents and make various recommendations. One of the limitations of using Profiler for workload analysis such as this is that query executions that are the same with the exception of the literal values are difficult to analyze together as a group. Take these two queries, for example:
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SELECT * FROM [authors] WHERE [lastName] = 'Smith' SELECT * FROM "authors" WHERE "lastName" = 'Brown'
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These are really different versions of the same query, so grouping them together for the purpose of obtaining the aggregate cost of the query is beneficial; however, without a significant amount of string-manipulation logic, this would be difficult to achieve. ReadTrace performs such grouping analysis automatically. Executed at the command line with a number of input parameters including a trace file name, ReadTrace Creates a new database, by default named PerfAnalysis, in a specified SQL Server instance Analyzes and aggregates information contained within the trace file and stores the results in the PerfAnalysis database Produces .RML files, which can be used as input for the OStress utility, which we ll discuss shortly Launches the Reporter utility, which graphically summarizes the results captured in the PerfAnalysis database The first step in using ReadTrace is capturing a trace file. In order for ReadTrace to work and provide the most beneficial analysis, we need to include a number of events and columns in the trace. The help file that s supplied with the RML utilities documents all the required events and columns. Once the trace file has been captured, the ReadTrace utility can be executed against it, an example of which follows:
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Readtrace -IG:\Trace\SalesTrace_1.trc o"c:\temp\rml" -SBNE-SQL-PR-01\SALES
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Monitoring and automation
Figure 14.11 Figure One of the many reports available in the RML Reporter utility. This one breaks down resource usage by query.
Once processing is complete, the Reporter utility automatically opens and displays the results of the analysis. The example report shown in figure 14.11 demonstrates one of the clear advantages of using the ReadTrace/Reporter utilities over manual analysis of SQL Profiler results stored in a table. Note the {STR} value in the Query Template column at the very bottom of the report for Query 1. The ReadTrace utility analyzes and aggregates different executions of the same query/stored procedure as a group by stripping out literal values such as stored procedure parameter values. In the example shown, {STR} represents RML s understanding of this as a parameter value. Thus, the total cost of all executions of this stored procedure will be automatically calculated. In addition to viewing the results of ReadTrace analysis via the Reporter utility, you can directly query the PerfAnalysis database for more advanced analysis. Finally, one of the major benefits of ReadTrace is the .RML files it creates once processing is complete. The OStress utility can use these files for both replay and stresstesting purposes. OSTRESS When covering the SQL Profiler trace replay option earlier in the chapter, we discussed one of its limitations: the inability to use multiple machines for replay purposes,
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