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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
6.6
Number of Reviews
273
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 1.7% compared to the previous year. The mindshare of SQL Server is 11.9%, down from 18.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Mindshare Distribution
ProductMindshare (%)
SQL Server11.9%
IBM Informix1.8%
Other86.3%
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."
"So far, we do not have a lot of issues. It's pretty problem-free."
"It supports multiple applications and business intelligence tools."
"Overall, this is a great product. It works really well, is very stable, and is very scalable."
"It supports in-house-built applications in .NET and VB6"
"OLTP processing capacity and the availability of information with high availability implementation have been significantly improved."
"The solution is quite stable and reliable; we use it mainly due to its general stable nature."
"Informix can support huge quantities of data with less memory and less capacity."
"It's a flexible solution."
"SQL Server is a stable product."
"We've mostly been pretty happy with its performance."
"The analytics are pretty good."
"The main feature of this solution is ease of use."
"I like the availability group functionality. We are setting up more clusters using availability groups. The enterprise licensing or Software Assurance makes it a little bit cheaper as well. It is nice to have that read-only copy for reporting and everything else."
"The Azure SQL Server database requires almost zero maintenance and management."
"Its stability delivers performance and usability."
 

Cons

"I really would love to have a QT plugin."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"The solution doesn't include functionality like data anonymization."
"In my opinion, the packages could be improved. The version I use doesn't allow for packages. I can do some general procedures, but no packages like in Oracle. So, develop separate modules in SQL language. This would be most beneficial for me."
"This solution is in need of more current tools."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"I really would love to have a QT plugin."
"This product could be made easier to use for beginners."
"The solution could offer better integration with other solutions - specifically Microsoft."
"SQL Server could improve by enhancing the integration abilities, adding more inbuilt data security features, and simplifying the maintenance."
"It would be ideal if the solution offered better integration capabilities."
"Performance-wise it's still not as good as on-premises, but it is easy to work with."
"It would definitely be better if SQL Server were free."
"From a DB administrator perspective, I would like to see more space requirements and space capacity history, so that we are able to see which DBs are growing, and by how much per day or week."
"The only item which I can list is application failure during Integration Services debugging, when restarting a process flow. In a number of instances the solutions fails. I have not given this much thought and simply stop and start the debugging service rather than restarting."
"Primarily, the data replication and the backup areas can be improved."
 

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."
"The product has reasonable pricing. We purchase its yearly license."
"I am not aware of the licensing costs or terms."
"It's cheaper than Oracle."
"Historically, SQL Server has been much more affordable than Oracle, which is overpriced."
"The areas that need improvement are with regards to the commercial aspect of the solution, the licensing cost could be reduced in order to help customers to adopt it."
"We pay per second of usage, but there are different offerings of the license."
"The price could be better. Aside from the basic features, if you need any additional features that can be extended, for example, if you want to connect with the heterogeneous databases, they are being managed as separate services and not included in the package. If you manage a database in Azure, it's not providing SFS and reporting services. However, on-premises, if you purchase the SQL Server license, it includes SFIS and SFRS services. If you take Postgre SQL and MySQL, they provide almost all the same features even though they are both open source databases."
"To scale the solution there are additional costs."
"We have an enterprise license, which we consider to be fine."
"Some of the licensing are very expensive, such as the Enterprise license."
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Top Industries

By visitors reading reviews
Comms Service Provider
9%
Construction Company
9%
University
8%
Computer Software Company
7%
Financial Services Firm
39%
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 Enterprise59
Large Enterprise117
 

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: March 2026.
885,728 professionals have used our research since 2012.