Submit and view feedback for This product This page. View all page feedback. In this article. Built-in functions display snapshot statistics about SQL Server activity since the server was started; these statistics are stored in predefined SQL Server counters. DBCC Database Console Command statements enable you to check performance statistics and the logical and physical consistency of a database. Database Engine Tuning Advisor analyzes the performance effects of Transact-SQL statements executed against databases you want to tune.
Database Engine Tuning Advisor provides recommendations to add, remove, or modify indexes, indexed views, and partitioning. It contains information about events in SQL Server that is not available elsewhere. You can use the information in the error log to troubleshoot SQL Server-related problems. Extended Events. Extended Events is a light weight performance monitoring system that uses very few performance resources.
Displays real-time statistics about query execution steps. Because this data is available while the query is executing, these execution statistics are extremely useful for debugging query performance issues. First, a rather long and unpleasant learning experience for me was figuring out an effective way to quickly refresh the entire test environment.
In those days, we had to restore a rather large database, reboot all the servers, and reinitialize our monitoring instruments. And, as mentioned earlier, only change one aspect of the SUT per test iteration.
Because of these performance concerns, the use of performance counters may need a bit of tuning. In the absence of any other recommendations, collect the following throughout the baseline or benchmark test:.
Long experience at assessing and interpreting the results of baselines has taught me not to rely on large tables of data with many data points. The mind glazes over quickly. It provides enough information to interpret the results and makes it easy for you to understand the overall trend of the performance metrics. The summary document is the second most important product of a baseline or benchmark test.
For baselines, the document should summarize things like common statistical values for important metrics, including minimum, maximum, average, median, and mode values. For benchmarks, the document should also summarize any important extrapolations and trends learned in the test. For example, in a benchmark to see how the current server performs with database compression enabled, the document might summarize that for every X amount of buffer used with compression enabled, CPU utilization increases by Y percent.
The summary document should also consider the impact of important system processes. For example, the SUT might be able to sustain a higher number of concurrent users except during the preventative maintenance cycle due to resources required for processes like backups, DBCC processes, or index maintenance.
Similarly, the document should consider important business cycles, such as the end of month accounting close or an important peak usage time. Many IT teams make the mistake of thinking about their baselines and benchmarks as self-contained artifacts.
Your baseline provides context for alerting and reacting to problems. SQL Sentry comes with built-in temporal baselines visible in the upper right corner of the dashboard, as shown in Figure 7. Typically, you can choose between one of three built-in baselines. Otherwise, the Average option will be displayed as an overlay in the dashboard. As it turns out, the spikes in waits, CPU, etc. Of course, normal doesn't necessarily mean acceptable. This functionality is simply not possible with the native Microsoft tools.
Figure 8: SQL Sentry dashboard with previous day temporal baseline overlay. When looking at longer time ranges—or when you choose it by selecting the Average radio button in the upper-right corner—the SQL Sentry dashboard will display the average value in each graph as a dashed line.
In the database industry, a benchmark is a test in which you collect the performance metrics of a system under a specific, predefined workload. In other words, benchmarks in the general industry equal custom baselines in SQL Sentry.
In addition to the built-in temporal baselines, you can create your own custom baselines specifically calibrated against specific time periods and workloads. To do so, simply click and drag to select a date range on any of the charts, right-click to invoke the context menu, and then select the Create Baseline menu option, as shown in Figure 9.
When you click the Create Baseline menu option, the Edit Baseline screen appears. This shows the Average, Min, Max, and Standard Deviation for each dashboard metric over the specified time range, as shown in Figure You can also select the checkbox in the Default column to choose which metrics are shown by default on multi-metric charts. Additionally, you can manually adjust the baseline value by editing a specific value in the Average column. For example, you might decide the average value for Page Life Expectancy 17, Clicking OK closes the dialog box and saves any changes.
When you select your new custom baseline, a horizontal line appears on each chart showing the baseline value for each metric. The line provides a reference point so you can easily spot unusual activity. In Figure 11, you can also see at around a. Time to investigate! You can create as many custom baselines as you want and edit them at any time by clicking the build button to the right of the drop-down menu.
For multi-metric charts, you can change the default metric shown without editing the baseline by right-clicking it in the legend. These visualization capabilities are great, but the feature wouldn't be complete without the ability to generate alerts using baseline metrics. This is where the other SQL Sentry functionality comes in. Using baselines in an Advisory Condition is easy. Instead of setting an explicit threshold value on the right side of a comparison, select Performance Counter Baseline, and its value for the metric is automatically substituted.
This way, if a baseline value ever changes, you won't need to update any conditions. In the Advisory Condition shown in Figure 12, we've added three separate baseline tests with some basic math to control the amount of deviation from the baseline value required to trigger the alert.
The system knows to use the Business Hours baseline value for the counter on the left side of the comparison.
Basically, the interface uses context-aware shorthand that will trigger the alert whenever Total SQL Server Waits are three or more times greater the baseline, when PLE is half the baseline, or when Total Server Processor Time is twice the baseline.
Since it generally reads easier with the counter on the left and threshold on the right, we recommend this approach anyway. It provides you with an empirical context for building a comprehensive service monitoring regimen. This enables you to provide exceptional levels of customer service, uptime, and proactive management for your SQL Server infrastructure. Features Database workload generation.
Database code scalability testing. Industry-standard benchmark testing. Virtual user and transaction load simulation. Tour Visual comparison View transactions per second and compare test runs to verify performance. Workload replay Find the optimal platform or database configuration for your environment. Scalability testing Prevent bottlenecks by validating SQL scalability and performance under load.
Easy-to-use console Easily conduct performance testing with an intuitive console. Specifications System Requirements. Before installing Benchmark, ensure your system meets the following minimum hardware and software requirements: Repository Benchmark Factory cannot run without a repository, and during installation you must select either the default service based or file based repository.
Applications that are running on your system. Size and complexity of the database. Amount of database activity. Number of concurrent users accessing the database. Microsoft Windows 8 Microsoft Windows 8. Virtualization Support. Before installing Benchmark Factory, review the following for virtualization support: Application Virtualization Benchmark Factory has been tested with the following: Citrix XenApp 6.
Resources White Paper. Change Without Degradation There is one universal database constant: no matter what, your database will change over time. White Paper. Top 10 Benchmarking Misconceptions According to Quest expert Bert Scalzo, many problems associated with benchmarking can simply be solved through education.
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