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Tuning the SQL Server instance typically involves adding more hardware to allocate more memory to SQL Server or adding more disk drives to reduce I/O latencies. As you know, there aren t a lot of SQL Server parameters that can be modified. SQL Server instance tuning typically is done by adding more hardware, which can be costly. If the application is not optimal, you can easily add more and more hardware and still end up with a poorly performing system.

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In order to properly troubleshoot or tune a system, you must follow a structured methodology. This methodology allows you to be scientific in your approach and to continually move forward in your tasks.

Now that you have some idea of the attitude and skills that are required for troubleshooting and performance tuning, it is time to look at some of the processes and methodologies for these tasks. Both troubleshooting and tuning benefit from using a standard methodology. So, what is a methodology A methodology is a set of rules, processes, and steps that you follow in order to perform a task in a scientific and repeatable manner.

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In this section, you are introduced to performance tuning, optimization, and troubleshooting methodologies. This is the methodology that I have used for several years. You can take this methodology as a guideline and adapt it to your own needs. This methodology has several steps: 1. Make an initial assessment and establish a baseline. 2. Monitor the system. 3. Analyze the results. 4. Create a hypothesis. 5. Propose a solution. 6. Implement changes. 7. Test the solution. 8. If other problems still exist, return to Step 2; if not, exit. These steps are covered in detail in the following sections.

The first step in tuning and troubleshooting is to understand the environment. It is important to begin by gathering information in order to learn about the application and begin to understand what problems, if any, exist in the system. Some things that should be done and completely documented in this step are as follows:

Click the Apply button at the bottom of the page. The next time this report is opened, a temporary copy of it will be placed in the cache to speed up its display for any later requests by other users within the same hour. At the end of 60 minutes, the temporary copy is removed from the cache. A new copy is placed in the cache only when a user requests the report again. As mentioned earlier, by using the caching option, you can improve performance for the next user who opens the same report. Any subsequent request for a report results in the display of the cached copy of the report rather than in the execution of the query and processing of the report. That is, any subsequent request displays the cached

Determine what the reported problem is Document database size, tuning parameters, and so on Look at the system as a whole Validate parameters

By performing these steps, you can get a feeling for where things are and how to approach the problem. This is a good time to talk with IT staff as well as end users, if possible, in order to learn from them about the issues. Inquire what they are doing when the problem occurs. Do some good investigative work to help you determine the problem.

Monitoring the system is the primary method of discovering the problem or tuning the system. Monitoring the system can take a number of forms, including viewing error logs, viewing perfmon data, and looking at application data. The goal of this step is to gather baseline information and to make an initial determination of the possible problems. Tools to monitor the system include the following:

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