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In this next set of recipes, I ll demonstrate how to capture and evaluate query performance. This book has focused almost entirely on SQL Server 2005 s flavor of Transact-SQL, and hasn t touched on the various graphical interface tools much. I ll be breaking with this tradition in this chapter to briefly show you how to use SQL Profiler to capture query activity. Also, I ll demonstrate how to graphically display the actual or estimated execution plan of a query so that you can understand the decisions that SQL Server is making in order to generate the query result set. I ll also demonstrate several other Transact-SQL commands, which can be used to return detailed information about the query execution plan.

If JRuby is not installed on your platform, download the ZIP or TAR file for the latest version from the JRuby site (http://dist.codehaus.org/jruby/). I downloaded jrubybin-1.0.zip because JRuby 1.0 happened to be the latest version while I wrote this chapter. Unarchive the ZIP or TAR file, and move its home directory to a suitable location. For example, I moved c:\unzipped\JRUBY-~1.0\jruby-1.0 to the root directory on my C: drive, resulting in c:\jruby-1.0 as the home directory. You should also add the home directory s bin subdirectory to your platform s PATH environment variable.

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In Windows, you can do this using the Add a Network Place task, for example, which allows you to type in the name of the server and share This option is not really a security measure but just a way to prevent people from finding out the existence of a share by simply browsing Another useful option is admin users You can use this option to specify a list of users or groups that will have administrative privileges on the share This means that all operations done by this user will be executed as the superuser (root) A final option we will cover is username map, which specifies a file that contains a mapping between Linux users and Windows users You can use this to allow certain Windows users to access the Samba server without that user needing to have an account on the Samba server.

There are usually two branches of query performance tuning: proactive and reactive. Proactive query tuning usually occurs during development. You design the database, populate it with data, and then start building queries. You build the queries based on application and end-user requirements. For those queries that don t perform well, you can tune them before deploying out in the stored procedure or to the application developer. Reactive performance involves capturing poor performance after the code has already been deployed to production. Data changes over time, and so does the effectiveness of indexes and the queries that use them. Queries that once performed well may execute longer than they did originally. You may hear complaints from end-users, or you might actually seek out poorly performing queries yourself. One of the most valuable graphical interface tools in the SQL Server 2005 toolset is SQL Server Profiler. With SQL Server Profiler, you can monitor query activity as it occurs against your SQL

Server instance. There are many potential uses for this tool, but this recipe specifically demonstrates how to use SQL Server Profiler to capture high duration queries. In this recipe, SQL Server Profiler is launched and configured to capture high duration queries. Then, a query is executed in SQL Server Management Studio that will be captured in SQL Server Profiler: 1. The recipe begins by going to Start, Programs Microsoft SQL Server 2005 Performance Tools SQL Server Profiler. 2. Once in SQL Server Profiler, go to File New Trace. This brings up the Connect to Server dialog box (see Figure 28-1). It is here that you select the name of the SQL Server instance to connect to, and the authentication method (either Windows or SQL). When you re finished designating these values, click the Connect button.

You can verify that JRuby has been installed by invoking the jirb (JRuby IRB) script to launch the Interactive Ruby tool at the command line. If all goes well, you should see an irb(main):001:0> prompt from which you can interact with JRuby. For example, type puts "Hello, from Ruby" and press Enter. In response, you should see Hello, from Ruby followed by => nil (which indicates that puts does not return a value) on separate lines. When you are finished with Interactive Ruby, specify exit or quit to terminate this tool.

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