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IBM Informix vs SQL Server comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Mar 4, 2025

Review summaries and opinions

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

Categories and Ranking

IBM Informix
Ranking in Relational Databases Tools
23rd
Average Rating
8.2
Reviews Sentiment
7.5
Number of Reviews
17
Ranking in other categories
Embedded Database (10th)
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) (1st)
 

Mindshare comparison

As of February 2026, in the Relational Databases Tools category, the mindshare of IBM Informix is 1.8%, up from 1.7% compared to the previous year. The mindshare of SQL Server is 11.8%, down from 19.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Market Share Distribution
ProductMarket Share (%)
SQL Server11.8%
IBM Informix1.8%
Other86.4%
Relational Databases Tools
 

Featured Reviews

Nasir Niamat - PeerSpot reviewer
DB Consultant at i2c
Has offered a cost-effective option despite frequent technical issues and limited market demand
We find some bugs in IBM Informix. Maybe we are using it more aggressively than others. Every month or every second month, we find some bugs in it, which is not ideal. It should be rare, not this frequent. The good thing is they cover those bugs in the next release within weeks or days on demand. IBM Informix should become hybrid and should include AI features similar to other DBMS systems such as Snowflake, Redshift, and DataBricks. This would help its value rise with the market.
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.

Quotes from Members

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

Pros

"The solution's stability, performance, enhanced functionality, and replication are all great features."
"IBM Informix benefits users with high availability and good integration capabilities."
"The scalability is very good."
"It supports multiple applications and business intelligence tools."
"It supports in-house-built applications in .NET and VB6"
"Every version is faster than the previous."
"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"The initial setup is pretty easy."
"The documentation and manuals are very good."
"The security and vulnerability management are well-managed through the vendor."
"Its usability is very good. Its performance is satisfactory."
"Most valuable features include: high availability, clustering, save backup and recovery."
"The performance is good."
"SQL Server is a stable product."
"The Azure SQL Server database requires almost zero maintenance and management."
"This solution is user-friendly and easy to understand."
 

Cons

"I really would love to have a QT plugin."
"I experienced poor input/output (IO) performance."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"The support team could include local engineers to establish efficient communication. It will help us speed up the escalation process."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"I would like to see backups from secondary servers."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"Every month or every second month, we find some bugs in it, which is not ideal."
"We experience latency at times when there is a lot of data being processed."
"I would like to see SQL Server add the ability to write to multiple sites or support replication between multiple sites at the transaction level."
"The installation process should be simplified."
"Occasionally the performance, as good as it is, is a bit off. We sometimes experience memory spiking. If they could maybe fix that aspect of the solution, that would be quite helpful for our organization."
"The security features of the solution could be better."
"I would like to see the database become fully automated."
"For small-scale businesses, Microsoft could improve by removing some limits in SQL Express."
"We would like to have a common storage option in the SQL Server. This option is available in Oracle Database. It would be great if Microsoft could create something like a columnstore that has not only indexing but also tables for common storage."
 

Pricing and Cost Advice

"For me, it's always too expensive."
"The free edition can be enough to handle moderate-size implementations, but you may want a pay for edition to benefit from more functionality, such as replication."
"The product has reasonable pricing. We purchase its yearly license."
"I am not aware of the licensing costs or terms."
"SQL Server's pricing has proven satisfactory for our market range."
"I don't need a license for it as I will be migrating to Office 365."
"The price of SQL Server is great. In my company, SQL Server is part of the Microsoft Suite, we don't have to pay for any additional license costs, it's quite cost-effective for us."
"This is a very cheap product."
"For our purpose, we are not required to have a license for what we are using it for."
"SQL Server is a cost-effective solution for a small database."
"Some of our clients purchase the license and others do not, they use Express SQL Server."
"As compared to Oracle Database, SQL Server is less expensive. For mid-sized organizations, SQL Server is completely all right, but people say it can't support large organizations with more than 2,000 users."
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Top Industries

By visitors reading reviews
Financial Services Firm
9%
Computer Software Company
8%
University
8%
Comms Service Provider
7%
Financial Services Firm
38%
Computer Software Company
7%
Manufacturing Company
6%
Comms Service Provider
4%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business9
Midsize Enterprise2
Large Enterprise8
By reviewers
Company SizeCount
Small Business119
Midsize Enterprise59
Large Enterprise115
 

Questions from the Community

What do you like most about IBM Informix?
It supports multiple applications and business intelligence tools.
What is your experience regarding pricing and costs for IBM Informix?
There is a cost reason to move from IBM Informix. It is relatively cheaper than Oracle. The second reason is that moving the whole application to a new database would require significant cost. The ...
What needs improvement with IBM Informix?
We find some bugs in IBM Informix. Maybe we are using it more aggressively than others. Every month or every second month, we find some bugs in it, which is not ideal. It should be rare, not this f...
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

Informix
Microsoft SQL Server, MSSQL, MS SQL
 

Overview

 

Sample Customers

Shaspa, Hildebrand, Kaifa, Ranhill Powertron, Federaci‹ Farmacutica (FedeFarma), Camden Council, The German Aerospace Center (DLR), Myers, Votorantim Group, Doosan Infracore, GreenIvory
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 Informix vs. SQL Server and other solutions. Updated: February 2026.
881,565 professionals have used our research since 2012.