What Are The Most Important Database Performance Metrics – In this article, we will show a process for tuning SQL Server performance, and some tools, tips and techniques you can use to monitor performance and take the necessary steps to improve it.
SQL Server is a common platform for enterprise-level database workloads. As your SQL Server database grows and supports increasing application usage, performance may suffer and database administrators need tools to identify, diagnose and resolve performance problems.
What Are The Most Important Database Performance Metrics
SQL Server runs in a dynamic environment: application data changes and the number of users or applications and the way they interact with the database can also change.
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A SQL Server database automatically manages system resources, such as disk space and memory, to reduce the need for large-scale manual optimization. SQL Server performance tuning allows administrators to see performance trends and determine if changes are needed.
SQL Server provides functions that provide information about database activity from the start. Data is stored in predefined counters.
You can use database console command (DBCC) statements to verify the physical and logical integrity of the database and obtain performance statistics.
Analyze the impact of a Transact-SQL statement on the database to optimize performance. DTA provides automated instructions for changing indexes, views, or partitions to improve performance.
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A new solution for SQL Server performance tuning, using the concept of A/B testing. This is a good way to evaluate specific versions of the SQL Server database engine for specific workloads.
Provides information on events logged by SQL Server, the SQL Server Agent, and the text search process, which you cannot get from other tools, and can be valuable in SQL server performance tuning. You can use it to diagnose and solve many types of problems.
A lightweight monitoring tool provided by Microsoft, which provides three dashboards for managing and analyzing session data: New Session Wizard, XE Profiler, and New Session.
Provides real-time data about query execution. This is very useful for troubleshooting query performance as part of SQL Server performance tuning.
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Provides database resource usage data, such as the number of buffer manager page requests. You can use it to track performance by defining counters and objects for specific events.
Provides a snapshot of current database activity, including, including system processes currently running or blocked, database locks, and user account activity.
Provides information about creating query execution plans. You can easily identify performance differences due to changes in query plan. The tool automatically collects and displays query history, query plans, and execution data. Query Store allows you to view data according to time intervals, to identify database usage patterns and understand how changes to the query plan affect the database.
Here are some tips you can use to perform SQL Server performance tuning on a production database instance.
Dashboard For Application Monitoring
Resource utilization is an important factor in SQL database performance. If you are using Windows, use System Monitor to view the behavior of SQL Server objects, other related system objects, and performance counters. The nice thing about System Monitor is that it shows the counters for Windows and SQL Server at the same time, so you can find correlations if there are performance issues.
The Database Engine Tuning Advisor helps you analyze the performance of Transact-SQL statements executed against your databases as part of tuning.
Advisor provides a wizard that you can use to analyze the performance impact of Transact-SQL queries. On top of that, it provides recommendations, for example, suggesting that you create or delete indexes.
Use the following T-SQL code to find the 20 lowest performing queries. The code was provided by Sripal Reddy Vindyala. Note that although the maximum average run time is high, the impact on the database is minimal if the query is rarely used. On the contrary, even if a query has a moderate average running time, but is run several times a day, it will generate a very high load on the database.
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It is important to refine T-SQL queries and add appropriate indexes, to help the SQL optimizer find the best execution plan for user queries. To address common user questions, you should consider their current implementation plan:
In this article, I cover the five-step process for SQL Server performance tuning, which includes defining your goals, choosing a tool or tools, identifying SQL Server components and metrics to track, monitoring , and analyze data to identify improvements.
I also cover the various monitoring utilities built into SQL Server and the Windows operating system, including Transact-SQL, DTA, DEA, and the Windows application event logs. Finally, I cover some simple ways to fix and improve SQL Server performance:
I hope this helps on your journey to a faster and more efficient SQL Server deployment.
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Gilad David Maayan is a technology writer who has worked for over 150 technology companies including SAP, Imperva, Samsung NEXT, NetApp and Ixia, producing technical and thought leadership content that explains technical solution for developers and IT leadership. Today he heads Agile SEO, the leading marketing agency in the technology industry.
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