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IBM Db2 Database vs SQL Server comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Nov 2, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
6.6
IBM Db2 Database offers high ROI with enhanced efficiency and performance, despite initial costs, supporting seamless business projects.
Sentiment score
7.2
Organizations experience significant returns and financial advantages with SQL Server, preferring its cost-effectiveness and analytics over Oracle.
SQL Server is the most cost-effective with good human resource availability to manage it.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
All applications need our repository to provide services for our online business or our customers, so the return is good.
Infrastructure Coordinator at a financial services firm with 10,001+ employees
With Standard edition, they have saved a ton of money and they are really happy about that.
Data Warehouse Lead at Resurs Bank AB (publ.)
 

Customer Service

Sentiment score
6.5
IBM Db2 support is generally reliable yet requires speed improvements; users find response times and expertise occasionally lacking.
Sentiment score
6.5
Microsoft's technical support is reliable, praised for responsiveness, though communication and on-premise SQL Server support may need improvement.
We normally receive substantial discounts on the price.
Associate Director, Data Architecture at a financial services firm with 10,001+ employees
There was a time when Microsoft support provided very crisp answers, but over time, they have diluted their support to third parties, leading to a drop in support quality.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
I give their technical support a rating of ten out of ten.
Data Warehouse Lead at Resurs Bank AB (publ.)
When we created support tickets, the experience was very positive.
Subdirector of Support for Production at Servicios Electrónicos Globales -Oficial
 

Scalability Issues

Sentiment score
7.1
IBM Db2 excels in scalability for large companies but faces challenges with horizontal scaling and increasing costs.
Sentiment score
7.1
SQL Server is highly scalable, especially in the cloud, though performance may vary with complex applications and configurations.
Most of the time, they simply add another node in the availability group.
Data Warehouse Lead at Resurs Bank AB (publ.)
The server where we installed it has grown from 64 gigabytes in RAM to 256 gigabytes, demonstrating significant scalability capabilities.
Subdirector of Support for Production at Servicios Electrónicos Globales -Oficial
I can scale both horizontally and vertically without challenges.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
 

Stability Issues

Sentiment score
7.7
IBM Db2 Database is highly rated for stability and reliability, though performance can dip with significant data growth.
Sentiment score
7.6
SQL Server is reliable and stable, performing well in transactions despite occasional performance and deployment challenges.
There was an issue with memory-optimized tables, but it was resolved in 2025, allowing you to remove that file group, which was not possible before.
Data Warehouse Lead at Resurs Bank AB (publ.)
All applications supporting SQL Server in my experience work very well across various industries including telecom, finance, banking, ad, entertainment, and workforce management.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
 

Room For Improvement

IBM Db2 Database needs usability, integration, and cloud improvements, plus better licensing, analytics, security, and standardization tools.
SQL Server faces criticism for requiring Internet Explorer, high licensing costs, complex operations, and lacking scalability and compatibility.
It might be slightly slower than other database vendors, but it works well since banks typically do not move quickly with leading-edge technology.
Associate Director, Data Architecture at a financial services firm with 10,001+ employees
It is fine to do a first release that works, but you cannot simply abandon it in the following years without service packs and improvements.
Data Warehouse Lead at Resurs Bank AB (publ.)
I would appreciate using Microsoft Pro as it can integrate with Excel or, with a simple query, consume information from the database using Microsoft Excel.
Infrastructure Coordinator at a financial services firm with 10,001+ employees
One long-pending request from Microsoft is for two-node write capabilities, as currently, I can write from one node and read from multiple nodes.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
 

Setup Cost

IBM Db2 pricing is complex and expensive, especially in Africa and the Middle East, but offers robust features.
SQL Server offers high initial costs but delivers value in features, scalability, and ROI, and is cheaper than Oracle.
Cost savings on human resources for Windows plus SQL Server versus other solutions.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
 

Valuable Features

IBM Db2 Database offers SQL, Java integration, scalability, security, and seamless IBM integration for flexible, reliable enterprise applications.
SQL Server offers robust features, ease of use, and reliability, ideal for organizations needing effective database management and optimization.
IBM Db2 Database, because of enterprise performance and support, is why banks still maintain their relationship with it.
Associate Director, Data Architecture at a financial services firm with 10,001+ employees
The IBM Db2 Database is trusted, and IT effort is less than any other product.
Network Administrator at GAEB
Always On HADR functionality is one of the features that I use on a daily basis and one of my most used features, saving me lots of time, especially since previously I had to build a SQL cluster and Windows clusters that had many dependencies on shared infrastructure, but now with Always On, it is too stable with easy management and almost zero maintenance, which SQL Server handles itself.
Manager - Production Database Administration at a tech vendor with 10,001+ employees
I have been working with SQL Server for a long time, and it works well for me as I am using it in different applications, such as web applications, Windows applications, or the data warehouse reporting.
Infrastructure Coordinator at a financial services firm with 10,001+ employees
The best features of SQL Server are availability and stability.
Subdirector of Support for Production at Servicios Electrónicos Globales -Oficial
 

Categories and Ranking

IBM Db2 Database
Ranking in Relational Databases Tools
5th
Average Rating
8.2
Reviews Sentiment
6.7
Number of Reviews
75
Ranking in other categories
No ranking in other categories
SQL Server
Ranking in Relational Databases Tools
1st
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
272
Ranking in other categories
Database Management Systems (DBMS) (4th)
 

Mindshare comparison

As of January 2026, in the Relational Databases Tools category, the mindshare of IBM Db2 Database is 6.6%, down from 6.8% compared to the previous year. The mindshare of SQL Server is 12.1%, down from 19.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Market Share Distribution
ProductMarket Share (%)
SQL Server12.1%
IBM Db2 Database6.6%
Other81.3%
Relational Databases Tools
 

Featured Reviews

reviewer2708292 - PeerSpot reviewer
Associate Director, Data Architecture at a financial services firm with 10,001+ employees
Support improves setup and maintenance while pricing influences decision
If you have a similar use case and the same deal with IBM as our company, it is definitely a good option and choice. The company I work with has more than 50,000 people and more than 500 support staff. We are not locked into one database vendor. We typically work with multiple database vendors simultaneously, selecting the top choice based on the deals we make and other considerations. We do not use IBM Db2 Database related to AI at this moment because our AI project PLC is still very small scale. We may consider it in the future if we have enough scale. Overall rating for IBM Db2 Database is 8.5 out of 10.
Peter Larsson - PeerSpot reviewer
Data Warehouse Lead at Resurs Bank AB (publ.)
Ledger and seamless integrations have strengthened trusted analytics and unified workloads
SQL Server's high availability and disaster recovery features work for supporting mission-critical applications, but there is much more to wish for. These features are not quite ready yet, although they do function. However, they could be significantly better. High availability and disaster recovery features should be improved in the next releases. I have noticed that everything could be improved or enhanced in the future, particularly temporal tables and window functions. Sometimes, I believe Microsoft releases features to stay ahead of competitors, but they do not make them feature-rich or feature-complete. They release something to be ahead of leaders and then seem to forget to maintain and upgrade them. I want Microsoft to pay more attention and be more mindful about the things they implement. It is fine to do a first release that works, but you cannot simply abandon it in the following years without service packs and improvements. You must continue to build on features rather than forgetting about them.
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Top Industries

By visitors reading reviews
Financial Services Firm
19%
Manufacturing Company
10%
Computer Software Company
9%
Government
8%
Financial Services Firm
38%
Computer Software Company
8%
Manufacturing Company
7%
Government
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business20
Midsize Enterprise13
Large Enterprise48
By reviewers
Company SizeCount
Small Business119
Midsize Enterprise59
Large Enterprise115
 

Questions from the Community

What do you like most about IBM Db2 Database?
Db2 database scalability and performance capabilities match our database needs. It covers pretty much everything a database administrator or engineer might need.
What is your experience regarding pricing and costs for IBM Db2 Database?
IBM Db2 is an expensive solution. While I am not heavily involved with pricing, additional companies provide capabilities or products like those from BMC, which many installations might also purchase.
What needs improvement with IBM Db2 Database?
The IBM Db2 Database is a good solution, but now there is a high maintenance charge. The IBM Db2 Database needs improved support, and there are many difficulties in using it. We tend to use the clo...
Would you say the price of SQL Server is high compared to that of similar products?
SQL Server is fairly priced because it has various editions, depending on the number of users, servers, or core packs you are using. If you compare the product to others in this category, the price...
Has using SQL Server helped your organization in any way?
SQL Server has helped my organization through partitioning to distribute the workload, as it splits them up into smaller pieces so the machines can easily deal with it. However, this comes with a h...
Which authentication mode is best for SQL Server?
My company connects through SQL Server authentication. We have company Windows accounts, but we do not want to connect the two, out of security concerns and to keep things separated for our own pur...
 

Comparisons

 

Also Known As

DB2
Microsoft SQL Server, MSSQL, MS SQL
 

Overview

 

Sample Customers

Knorr-Bremse, Mizuho Bank Ltd., Australian Government Department of Defence, SCHWENK Zement, Friedhelm Loh Group, YAZAKI Europe Limited, Ekornes ASA, Baldor Electric, VSN Systemen BV, Lion Brewery (Ceylon) PLC, PLANSEE Group, TE Connectivity, Hansgrohe SE, Openmatics, University of Toronto
Microsoft SQL Server is used by businesses in every industry, including Great Western Bank, Aviva, the Volvo Car Corporation, BMW, Samsung, Principality Building Society, Wellmark Blue Cross and Blue Shield, and the Catholic District School Board of Eastern Ontario.
Find out what your peers are saying about IBM Db2 Database vs. SQL Server and other solutions. Updated: December 2025.
879,899 professionals have used our research since 2012.