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SQL Server vs DB2: Advantages and Disadvantages – Querychat

In this article, we will discover two DBMS, namely the MS SQL Server and IBM DB2. Also, we will find out what are their advantages and disadvantages.

Microsoft SQL Server

Microsoft SQL Server is one of the most popular DBMS. This is a database management system, the engine of which runs on cloud servers, as well as on local servers. It is possible to combine the types of servers used simultaneously.

Shortly after the release of Microsoft SQL Server 2016, Microsoft adapted the product for the Linux operating system. Initially, it only worked on the Windows platform.

One of the unique features of the 2016 version is temporal data support, which allows us to track data changes over time. The latest version of Microsoft SQL Server supports dynamic data masking, which ensures that only authorized users will see sensitive data.

Advantages Disadvantages
The product is very easy to use. The price of legal entities is unacceptable for most organizations.
The current version is fast and stable. Even with careful performance tuning, SQL Server can consume all available resources.
The engine provides the ability to adjust and track performance levels that help to reduce resource use. Reported issues using the integration service to import files.
We are able to access visualization on mobile devices.
It interacts very well with other Microsoft products.

Table 1. Pros and cons of using the MS SQL Server

It is ideal for large organizations that already use a range of Microsoft products.


DB2 is a database management system created by IBM. It has NoSQL capabilities and can read JSON and XML files. Due to the fact that the system was developed for IBM’s iSeries servers, the system runs on Windows, Linux, and Unix.

The SQL language dialect used in DB2 is strictly declarative (with rare exceptions); the system is equipped with a multiphase optimizer that builds a query execution plan using these declarative constructions.

In the DB2 SQL dialect, there are no hints for the optimizer, the language of stored procedures is poorly developed, and, thus, everything is aimed at maintaining a declarative style of writing queries.

In this case, the DB2 SQL language is computationally complete, that is, it can declaratively determine any computable correspondence between the source data and the result. This is achieved, among other things, through the use of table expressions, recursion, and other developed data manipulation mechanisms.

The DB2 optimizer makes extensive use of statistics about the distribution of data in tables if the collection process was performed by the database administrator. This is why the same SQL query can be translated into completely different execution plans, depending on the statistical characteristics of the data it processes.

As part of the increasing level of integration in security features in a computer system, DB2 does not have its own means of authenticating users, integrating with operating system tools or specialized security servers. DB2 only authorizes users authenticated by the system.

Modern versions of DB2 provide enhanced support for using XML data, including operations with individual elements of XML documents.

In early June 2019, IBM announced the addition of artificial intelligence to its DB2 relational database engine, the first version of which was released 36 years earlier.

The updated DBMS supports the development of applications for intelligent data processing using new drivers that implement compatibility with various programming languages ​​and platforms. IBM says developers can easily build and analyze machine learning models for applications built using DB2. It is anticipated that such programs will be more reliable, require fewer resources for management, and help increase productivity.

Advantages Disadvantages
Blu Acceleration allows us to correctly utilize resources for large databases. The price is quite expensive for small organizations and individuals.
The host can be both the cloud or the physical server. Also, there can be both at the same time. Third-party applications or other software is required in order to make clusters or several secondary nodes functions.
Several tasks can be performed simultaneously using the task scheduler. The free support is only available for three years, then the only paid one is available.
Error codes and completion codes make it easy to track which tasks are being performed or completed using the task scheduler.

Table 2. Advantages and disadvantages of using the DB2

DB2 is suitable for large businesses that plan to squeeze the most out of available resources and process large databases.

It is not entirely true to pose the question as “DB2 vs SQL Server“, because both DBMSs are suitable for their own purposes and each for its own budget and type of business.

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