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As statistics are recorded during the process, you can analyze the results when you re done, to get an idea of the response times and throughput you could expect in the real world. When testing this way, keep in mind that you might exceed certain parameters. For example, if I attempt to simulate 100 concurrent connections from a single workstation, the network bandwidth or the processing power of the client might be the bottleneck. Also, be aware that queries will run much faster after they are cached. The results you receive might be quite different when many different types of queries are being run against the database. Nevertheless, SQL Load Simulator can be useful in making best guesses of anticipated server capacities. s Database Generator Database Generator is used for generating data to be loaded into a database. It is a Visual Basic application that provides an interface for generating data. Users can specify the number of data records per day and the types of values to be loaded into the database. Database Generator is a little rough around the edges, but it can be useful. Data Simulator, described next, is another tool that can be used for the same task.
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Data Simulation Tool Often, the problem for DBAs is that there s just too much data to manage. When planning your backup solution, however, you might have the opposite problem: not enough information to adequately test your hardware and software. The Data Simulation Tool is a simple Visual Basic application that can connect to a table within an existing database, analyze the data that is stored there, and then automatically generate random data to increase the size of the database. The tool takes input parameters in the form of a VBScript file and then generates the number of INSERT commands you request (see Figure 6-3). These parameters specify how the data should be generated. You can either save this file for later use or execute it against the current database. Although much of the data will be randomized, this is a good way to artificially grow test databases for testing backup performance.
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Figure 6-3.
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SQL HD Test This utility can be used to test the speed of disk I/O on your current system. It can be useful in determining the impact of redundant array of independent disks (RAID) or other hardware-level modifications you might have made to your system. The tool is rough around the edges, so you ll need to make sure you understand the various commands and switches before running the program successfully. The results will be information similar to what you might receive when you run the Windows NT Performance Monitor, but the tests focus more on issues related to database server performance.
This by no means is an exhaustive list of all the tools and utilities included in the BackOffice 4.5 Resource Kit. In this section, I ve listed only those tools and utilities that might be of use to database and systems administrators interested in testing backup and recovery options. For more information on the Resource Kit, see www.microsoft.com/backoffice.
RAID
In 3, Data Protection in Windows NT/2000, we looked at an overview of RAID technology and how it can be implemented in a Windows NT/2000 environment (at the OS level). In 5, Evaluating Data Protection Solutions, we looked at other implementations of RAID, including the advantages of using hardware-based disk control-
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lers for this purpose. The important benefits of using RAID technology are that it can increase performance, provide for fault tolerance, and simplify administration. In this section, we look at each of these benefits in turn and determine how they pertain to the design of your SQL Server storage configuration. We ve already covered fault tolerance: When redundancy is built into a disk array, the failure of a single disk will not cause a loss of data. Although there may be a decrease in performance and a decrease in usable disk space, certain types of RAID solutions will allow you to quickly and easily replace a failed disk without stopping network service. This increases uptime and, ultimately, ensures that your users can work uninterrupted in the event of a failure. When data is retrieved from multiple physical disks in a disk subsystem, the results are faster data access and increased throughput both of which are benefits that can greatly increase database performance. Finally, as we ll see in the next section, configuring files and filegroups to specifically store information across physical devices involves extensive planning and understanding of the underlying data structure. For most environments, however, the costs associated with purchasing RAID solutions for database servers is a good investment.
NOTE: In 5, we discussed the issues related to using write-caching disk controllers. In some cases, a failure of a RAID controller or an unexpected restart of the server (due to, for example, a loss of power) can cause database files to be left in an inconsistent state. Be sure to review that information before implementing a hardware-based RAID solution.
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