Log In to start Learning

Login via

  • Home
  • Blog
  • How Performance tuning and ...
Post By Admin Last Updated At 2023-05-26
How Performance tuning and Optimization done in SQL Server DBA

One of the quickest ways to improve the speed of your Microsoft SQL Server is widely thought to be query tunning. Improvements to system-level server performance can be costly and ineffective. Furthermore, professional developers believe that rather than hardware limitations, the majority of SQL Server performance difficulties can be directly linked to poorly written queries and insufficient indexing. Query optimization and tuning are the only ways to tackle many performance issues.

It can be difficult to know where to begin with SQL Server performance tuning. There isn't a set "right" or "wrong" response in terms of query tuning; it's not an exact science. Instead, DBAs are required to identify the best answer to any given problem or situation.

This tutorial will define SQL Server performance optimization, discuss its significance, and show you how to apply best practices using SolarWinds® Database Performance Analyzer (DPA).

What Is SQL Server Performance Tuning?

The term "SQL Server performance tuning" refers to a collection of techniques and procedures used to enhance the performance of relational database queries. Finding the slowest queries and optimizing them for maximum performance are just two of the components of SQL optimization. SQL tuning will be advantageous for many relational databases, including MySQL and SQL Server.

DBAs can make an effort to address system-level server performance issues, typically by adding more memory and CPUs. However, these solutions are pricey, and they might not be successful in addressing the issue of sluggish requests. You can find instances of inadequate indexing and poorly constructed SQL queries with the aid of SQL performance tuning. If you do this, you might discover that you don't need to spend money on upgrading your hardware or technical specs.

Tuning SQL performance can be challenging, especially when done manually. The performance of SQL servers and databases can be significantly impacted by even minor changes. You must have efficient SQL Server performance tuning tools available as a result.

Want to know more information on SQL Server Performance Tuning? Enroll today for SQL Server DBA Online Training

Why Is SQL Server Performance Tuning Important?

Storage and information access are typically regarded as the two main purposes in enterprises. Servers and databases must run as efficiently as possible since both internal and external users expect websites and applications to respond quickly and effectively.

Even though a query delay of a few milliseconds might not seem like much, if each of your database requests has a similar latency, it can quickly build up. Information retrieval from a database might take a long time when this is combined with enormous amounts of continuously created data. The functionality of the entire firm will probably be affected if business-critical operations start to run slowly.

DBAs must monitor SQL Server performance and make sure database-related activities are efficient to successfully tune SQL.

SQL Server Performance Tuning Tools

Users can enhance the performance of their indexes, queries, and databases with the use of SQL Server performance tuning tools. They offer suggestions for indexes that might need to be added, removed, or updated to fix performance concerns. Real-time performance monitoring is done by SQL Server data tools, which may also have to tune advisors that can advise on server partitions and indexed views. In addition to generating information on the query execution steps, several SQL Server performance tuning tools also help discover and improve server and database performance issues.

The purpose of SolarWinds Database Performance Analyzer is to take most of the guessing out of SQL Server optimization. You may set performance baselines with its continuous monitoring, which combines reaction time analysis with historical trend analysis and logs. Rapid detection of aberrant behavior is possible with DPA, and the tool will eventually become more intelligent and intuitive due to machine learning capabilities.

You can take advantage of unused SQL Server optimization opportunities with the help of the integrated table tuning advisor that is part of DPA. The tool helps you tune your system by identifying tables with inefficient SQL queries by analyzing queries and plans. With analysis findings graded by relative workload, its integrated SQL performance analyzer provides you with specific information on inefficient SQL statements accessing tables.

||{"title":"Master in SQL Server DBA ", "subTitle":"SQL Server DBA Online Training by ITGURU's", "btnTitle":"View Details","url":"https://onlineitguru.com/sql-server-dba-training.html","boxType":"reg"}||

The DPA query performance analyzer feature gathers important information about a query and presents it in a clear and understandable dashboard style. This tool creates charts so you can easily and rapidly fix performance issues that have been found. DPA offers customizable reports and alerts as well, keeping you informed and letting you know how blocking can affect performance.

SQL Server Performance Tuning Best Practices

Finding slow queries or queries that aren't performing as quickly or efficiently as they should be is the first step in effective SQL Server performance tuning. The process of SQL tuning can be either proactive or reactive. The goal of proactive SQL Server performance tuning strategies is to stop predictable problems from happening again. Reactive SQL Server performance tuning methods address problems as they arise.

Best practices for general SQL Server performance tuning include:

  • Indexing with care: Indexes are data structures created to speed up retrieval by allowing you to choose rows fast. Indexing needs to be done properly to prevent bottlenecks.
  • Avoiding coding loops: clear of overloading and repetitive querying to prevent coding loops.
  • Avoiding correlating SQL subqueries: Subqueries are the parent query and are executed row by row. This could take some time.

Want to get practical explanation on these practices? Enroll today for SQL Server DBA Course

Statistics and wait times are fantastic tools to decide where to concentrate your tuning efforts. User queries are handled by SQL Server as "threads." DBAs are better able to pinpoint the queries that aren't executing as they should by tracking thread performance. Recall that the goal of tuning is to minimize throughput (the number of resources needed to process a statement) and decrease reaction time (the length of time between a statement and a response).

DBAs need knowledge of all database and server layers to get deep into the root of a SQL Server performance issue. You may speed up and simplify your tuning procedures with the use of SQL Server performance tuning tools, which will also help you gain a better understanding of the top SQL statements, blocked queries, wait kinds, and the effects of missing indexes on server or database performance.

To enhance the performance of your server and database, utilize SolarWinds DPA in conjunction with the following SQL Server performance tuning best practices:

1.Conduct Response Time Analysis

Response time analysis is a practical method for improving SQL Server query performance that enables you to produce observable effects. This procedure, also known as wait time analysis, enables IT teams to more effectively coordinate their service-level delivery efforts for their clients. Wait approaches examine the actual amount of time it takes to complete an operation rather than monitoring server health and making assumptions about how it will affect performance. Analysis of response times is a top objective for SolarWinds DPA.

2. Analyze How Resource Provisioning Affects Response Times

By assisting you in coordinating resource provisioning with database performance, DPA enables you to recommend hardware more firmly. The SQL query analyzer can be used to determine how resource provisioning affects response times. Additionally, this capability gives developers a distinctive viewpoint on their VMware infrastructure and how it affects overall database performance.

3. Analyze Historical Trends

For your SQL tuning efforts, DPA provides a historical data repository built to show patterns and abnormalities. DPA offers you access to historical data ranging from five seconds to five years, enabling you to immediately spot performance problems and bottlenecks and rectify them.

4.Know Tables and Row Counts

Make sure you're performing operations on a table rather than a view or table-valued function when you apply SQL Server performance tuning strategies. Table-valued functions differ in how they affect performance. Table row count, churn, index fragmentation, and other aggregated information about the table may be found using the Table Tuning Advisor tool in DPA.

||{"title":"Master in SQL Server DBA ", "subTitle":"SQL Server DBA Online Training by ITGURU's", "btnTitle":"View Details","url":"https://onlineitguru.com/sql-server-dba-training.html","boxType":"reg"}||

5. Examine Query Filters, Clauses, and Row Count

You might want to think about if all the supplied data is strictly necessary if no filters are used and the majority of the table is returned. If there are no filters at all, there might be a problem, so you should look into it more. This can drastically slow down a query.

6. Understand Table Selectivity

If you've followed the two suggestions above, you should be aware of how many rows or how big the actual, logical set is. You must have a thorough understanding of table selectivity in order to ensure that your tuning efforts are effective. Additionally advised is the use of SQL diagramming to evaluate queries and query selectivity. This is a strong and practical instrument.

7. Analyze Additional Query Columns

Examine the SELECT* or scalar functions carefully to see if more columns are involved. It may become less advantageous for an execution plan to use specific index procedures as more columns are brought back. Performance may suffer as a result of this.

8. Understand Constraints

Constraints can be used and known when you begin the tuning process. To prevent repeating efforts or overlapping existing indexes, you must check current keys, indexes, and restrictions. You can use the sp_helpindex stored procedure to find out more about your indexes.

9. Examine the Execution Plan

       Actual plans, on the other hand, use actual statistics at runtime whereas estimated plans use approximated statistics to determine the estimated rows. If the estimated plan differs from the actual plan, this can be cause for further investigation. Each execution plan that DPA discovers is listed, giving you the option to click a link to view the entire plan and the steps with the most inefficient access paths that might require attention

10. Record Results

Make sure to note your results when performing SQL Server performance tweaking. This will enable you to evaluate the actual effects of any adjustments you make.

11. Adjust Queries

It can be useless to make too many adjustments at once because they may cancel one another out. Consider starting with the most expensive procedures; keep in mind that there is no established "correct" response. Instead, make an effort to identify the best option for the current circumstance.

 12. Rerun Query and Record Results

Examine other factors you might need to change if you observe an improvement in logical I/Os but the improvement isn't substantial enough. Rerun the query after each change, then compare the outcomes. Continue doing this until you're confident you've addressed and corrected all the costly operations you can.

  13. Adjust Indexes

The best course of action for DBAs isn't usually to add or alter indexes. This might be your only choice, though, if you are unable to change the code. Think about enhancing current indexes, a covered index, and a filtered index. If you've made changes, run the query again, note the outcomes, and contrast them with prior iteration

   14. Identify Potential Performance Inhibitors

Watch out for factors that affect performance repeatedly. Code first generators, scalar functions, cursors, nested views, misuse of wildcards, and row-by-row processing are a few examples of this.


Because the present virtual world depends on data that is effectively structured with the help of databases, learning SQL Server can lead to lucrative professions in the top MNCs and secure a bright future. Enrol in SQL Server DBA training to earn your professional certification. Call the OnlineITGuru support team right now.