SQL Database Management: 11 Best Practices to Optimize SQL Database Performance

  • Updated on November 11, 2022
  • General

What is an SQL database?

SQL or Structured Query Language has been present since the late 1970s. It is a computer language now commonly used in sound database systems to manipulate and store data. SQL databases have become known as the workhorse of the backend development industry as most processes involved are the foundation of different techniques we see today.

5 Key Advantages of SQL

  1. There is more accessibility to data.
  2. Users can define and manipulate data for smoother operations.
  3. Users can provide better data descriptions. 
  4. Integration with version control tools for structured database systems, eg. Git SQL.
  5. It allows users to establish permissions for the database’s views, procedures, and tables. 

11 Best Practices to Optimize SQL Database

Application of Correct Indexing in Tables

The SQL optimizer is reliant upon defined indexes for each existing table. It is necessary to have a suitable balance of indexes throughout all tables. It is also crucial to organize different index fields and the order they are all placed in. With proper indexing, users can achieve maximum performance in reduced time and reduce the need for additional modifications.  

Optimization of Correlated Queries

Correlated queries utilize all entered values from a parent query. Hence, they require a table alias that helps determine and place the references that users must put to use. 

Cleaning up Temporary Tables

Sometimes, procedures and data modifications may have to get stored in temporary tables. While it’s best to avoid them since they add complexity, some processes may require their use for more convenience. The temp tables may speed up your work. However, it’s best to delete them after use so that no further complications remain.

Replacing Many Subqueries

Replacing subqueries with JOINs can help optimize the performance of an SQL database. With these, it becomes more convenient to access any alternate requests arising from queries and take necessary actions. 

Buffer Cache and Steps

With the help of buffer cache, there is more provision of memory which in turn decreases the need for a physical I/O. The server can then query pages from the cache instead of a disk. With its practical usage, there is better optimization of I/O as it allows users to read pages with the help of one operation.

Query Optimization

Optimizing all existing queries can help improve how an SQL database functions. By using techniques such as cost-based or heuristic optimizations, users can provide better clarifications for query executions. 


Sometimes, even after optimizing methods, data recovery options may fail to perform as efficiently as needed. In such instances, a form of de-normalization may be required. To do this, there will have to be certain exchanges taking place between data redundancy and select operations. De-normalization should only be applied when key tables are involved to avoid complexities arising.

Advanced Indexing

Using registered columns for backend calculations may prove expensive if a vast number of rows are included. Users can apply distinctive indexing methods to enhance all columns’ procedures in such cases. 

Grouping of Files

For higher optimization of an SQL database, organizing all files stored can help improve all procedures and tables. An SQL database and its development include the file types of .mdf, .ndf, and .ldf. Organizing all data under relevant file categories can enhance the database performance. 

Table Partitions

In an SQL database, partitioning refers to splitting up large tables into smaller and more manageable ones. It enhances the way different executions can take place and lessens the amount of data each query is required to examine.

Security of Code

With all tables in the SQL database, there are large amounts of data stored that may result in a heavy loss if attacked by malicious outside parties. Users can optimize the security with the help of parameterized statements, input validations, and more to make the system more secure and reduce vulnerability. 


The SQL database has become an important part of how different technologies function. It is beneficial to many departments, and its integration can help speed up several kinds of processes. By using the best practices necessary, it is possible to enhance how an already reliable SQL database functions. By making it more advanced, secure, and fast, it is possible to unlock new potentials of how an SQL database can function.


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