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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
24th
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 April 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 11.2%, down from 17.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Mindshare Distribution
ProductMindshare (%)
SQL Server11.2%
IBM Informix1.8%
Other87.0%
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

"OLTP processing capacity and the availability of information with high availability implementation have been significantly improved."
"Informix can support huge quantities of data with less memory and less capacity."
"It supports in-house-built applications in .NET and VB6"
"Flexible Grid provides the ability to automatically create database objects, such as tables, indexes, and stored procedures on all nodes within the grid as a single operation."
"Replication is a valuable feature and easy to use."
"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"For IoT business cases, having Informix Enterprise Edition work on edge computers, like Raspberry Pi and using Informix replication, makes complex situations simple to build and maintain."
"The initial setup is pretty easy."
"SQL Server is a very mature solution."
"There was an online system in which we had about 2500 requests to the DB per second. Every request had a completion window of one second to process and retrieve data. After switching to SQL Server, and AlwaysOn, and Snapshot, and tinkering, and configuring and tinkering, the handling capacity we measured increased to about 5000 requests per second, while the time decreased to 0.5 seconds per request."
"SQL Server is easy to manage because all our DevOps team are familiar with it and simple to access because it is cloud-based."
"Technical support is very good."
"The solution is easy to use, has rich feature sets, and is business-oriented."
"To others who are interested in using this solution, I would say go for it."
"We always like to work with the best products, we are happy with SQL Server, and I recommend it."
"The columnstore index feature is useful for us, and we also use the integration services."
 

Cons

"The solution should offer replication. It would be helpful if the solution would allow us to access third-party tools."
"Every month or every second month, we find some bugs in it, which is not ideal."
"I really would love to have a QT plugin."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"Informix is very sturdy, but the problem for us is the marketing action around Informix."
"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."
"I really would love to have a QT plugin."
"Indexing, as well as integration, are areas of this product that need improvement."
"Sometimes, when you have a lot of information running on the SQL databases, the system hangs."
"They could improve the solution by allowing more portability between on-premise and the cloud."
"The UX design of this system needs improvement."
"For a big amount of data, when we are speaking about IoT Segments, and Big Data projects, there are performance issues."
"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 by having better usability or user guidance."
"On the SQL Server Management Studio (SSMS) side, I have noticed more bugs in terms of being able to connect to our SQL servers."
 

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."
"Although it comes with a cost, using the most recent version is highly advisable, since it would ensure a certain measure of bug fixes and stability. The sole issue would involve the cost, as this is expensive."
"With recent releases, the Standard Edition (cheaper) SKU has some of the earlier version Enterprise features. SQL Express has some limitations."
"Currently, almost all of my machines are in Azure and I think it is the best way of licensing now (VM+software)."
"For smaller companies, they find this solution expensive."
"The licenses are purchased annually."
"The product is expensive."
"Since we are a cloud-based company, there is AWS pricing on top of the SQL Server pricing. The Enterprise Edition can typically sell from around $1000 dollars a month, which is not cheap. Then, there is an additional one-time Windows cost, based on the code, which can go anywhere from $30,000 to $40,000 for the license."
"There is a license required for this solution and we pay monthly. The price is reasonable compared to other solutions."
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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%
Computer Software Company
5%
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 Enterprise60
Large Enterprise118
 

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.
890,027 professionals have used our research since 2012.