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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
25th
Average Rating
8.2
Reviews Sentiment
7.5
Number of Reviews
17
Ranking in other categories
Embedded Database (9th)
SQL Server
Ranking in Relational Databases Tools
1st
Average Rating
8.4
Reviews Sentiment
6.6
Number of Reviews
274
Ranking in other categories
Database Management Systems (DBMS) (1st)
 

Mindshare comparison

As of May 2026, in the Relational Databases Tools category, the mindshare of IBM Informix is 1.8%, up from 1.8% compared to the previous year. The mindshare of SQL Server is 10.7%, down from 17.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Mindshare Distribution
ProductMindshare (%)
SQL Server10.7%
IBM Informix1.8%
Other87.5%
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

"This solution has made financial reporting possible by allowing financial people the opportunity to set Informix to "Auto Pilot" so that they can attend other duties."
"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"My advice is to take it; you will never regret it."
"It supports multiple applications and business intelligence tools."
"So far, we do not have a lot of issues. It's pretty problem-free."
"The initial setup is pretty easy."
"Every version is faster than the previous."
"We don't have any problems with the Informix Database."
"The documentation and manuals are very good."
"Now we can supply a 16-core, 15TB, data warehouse loading hundreds of thousands of transactions per day for $100,000 purchase or cheaper via hosting partners."
"The performance is reliable."
"As an engineer working for multiple organisations, MS SQL has proven stability and operational power."
"Similar to Microsoft SQL, it is easy to scale."
"I find SQL Server's ability to integrate with other Microsoft services, such as Azure, in supporting business intelligence and data analytics workflows to be excellent."
"The solution is very easy to use. It's intuitive and easy to navigate. Overall, it's a straightforward product."
"The most valuable feature of SQL Server is the performance."
 

Cons

"The solution should offer replication. It would be helpful if the solution would allow us to access third-party tools."
"The solution really doesn't add new features very often. Other solutions are much more actively pushing out upgrades and improvements."
"I experienced poor input/output (IO) performance."
"The solution doesn't include functionality like data anonymization."
"Informix is very sturdy, but the problem for us is the marketing action around Informix."
"For me, it's always too expensive. The problem is that Informix sometimes competes with free products, so yes, it's very expensive, but when we're talking about licensed products like SQL Server or anything, the midsize pricing could be significantly improved."
"I really would love to have a QT plugin."
"The pricing is a bit expensive."
"Technical support could be better."
"The scalability is adequate but could improve."
"SQL Server is not going to do that. In this way, it is not very scalable."
"There is room for improvement in performance when managing a large quality of data and a high number of active users."
"SQL Server could improve the integration with nonrational database solutions, such as MongoDB."
"The free version of SQL Server is time-limited before updating to the paid version."
"It's difficult to make changes. It's a very complicated product in general — that's the issue."
"Technical support could be faster."
 

Pricing and Cost Advice

"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."
"For me, it's always too expensive."
"I am not aware of the licensing costs or terms."
"The product has reasonable pricing. We purchase its yearly license."
"The pricing from Microsoft is quite expensive compared to Oracle."
"The licenses are really expensive. Their licensing model should be more simplistic."
"It is expensive."
"For smaller companies, they find this solution expensive."
"The price of the solution is very expensive. If I went with the cloud version of SQL a license would cost me approximately 11,000 Riyals per month."
"Licensing fees are paid on a yearly basis."
"The price could be cheaper."
"There is a license to use this solution. However, the model is not easy to understand. There is a guide you have to read about all the information on how it works. If you read this documentation, you can understand how it works. We are paying for our SQL Servers by CPU cores with an enterprise license."
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Top Industries

By visitors reading reviews
Comms Service Provider
9%
Construction Company
8%
Financial Services Firm
8%
University
7%
Financial Services Firm
40%
Manufacturing Company
6%
Comms Service Provider
5%
Computer Software Company
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 Enterprise60
Large Enterprise119
 

Questions from the Community

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...
What is your primary use case for IBM Informix?
We are using IBM Informix for OLTP systems. We are using IBM Informix although it is a technology that is not very popular compared to others. We are using it because our application was initially ...
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: April 2026.
894,830 professionals have used our research since 2012.