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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 March 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."
"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."
"Every version is faster than the previous."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"The scalability is very good."
"It supports multiple applications and business intelligence tools."
"So far, we do not have a lot of issues. It's pretty problem-free."
"The stability is incredible. I have customers with uptimes of several years."
"SQL Server is similar to other Microsoft products, such as BI, they are easy to use. You do not need to have an expensive BD to maintain them. All the useful intuitive features you find in Microsoft solutions you will find in SQL Server."
"Enables us to convert to bigger DBs and more easily move or upgrade between branches."
"Tuning Advisor suggests where to add indexes and from where to remove them. It works like an adviser."
"It's more user-friendly than most databases."
"It's a good learning environment, it's easy enough to learn and understand. Anybody that picks up the language early on will be able to develop in it."
"The product’s most valuable features are flexibility and scalability."
"We found it to be quite scalable."
"We like business integration, database, and analysis."
 

Cons

"I really would love to have a QT plugin."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"This product could be made easier to use for beginners."
"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."
"The solution lacks some functionality."
"I experienced poor input/output (IO) performance."
"This solution is in need of more current tools."
"Every month or every second month, we find some bugs in it, which is not ideal."
"In terms of exceptionally large databases, it doesn't scale as well as Oracle."
"Security is an issue."
"Primarily, the data replication and the backup areas can be improved. It should have data replication capabilities and uptime capabilities."
"SQL Server could improve the integration with nonrational database solutions, such as MongoDB."
"Their datatypes need improvement."
"SQL Server needs to improve in performance and monitoring because there are no specific monitoring solutions to detect and analyze events for issues in the database. You have to use another monitoring solution. If Microsoft could provide an update to this solution or provide a monitoring solution specifically for SQL Server, it would be very valuable."
"They can build more performance-tuning tools in it. They can also make the stuff a little more user-friendly and provide the ability to schedule jobs. They can perhaps also streamline it a little bit so that it is not so resource-intensive, which would be helpful. SQL Server has a tendency to consume all the memory you allow it to. If you are not careful, you can basically break your server. I would like to see it having a smaller footprint in terms of system resource consumption. They might want to consider re-evaluating their pricing. It is expensive."
"It could be more stable."
 

Pricing and Cost Advice

"The product has reasonable pricing. We purchase its yearly license."
"I am not aware of the licensing costs or terms."
"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."
"We are on an annual enterprise license for the solution and the cost of the license could be reduced."
"We didn't have any licensing costs for SQL Server."
"I don't need a license for it as I will be migrating to Office 365."
"It's cheaper than Oracle."
"Cost is a major derivative for any organization. It has a reasonable cost value, and its cloud support is also better than others. Comparatively, Oracle can do the same things or is even better in certain areas, but it is expensive. The cost along with the support are the plus factors for SQL Server."
"There is a license required for this solution."
"If you are looking for a small setup and do not want an open-source solution or invest too much money in your database then SQL Server is a very good choice."
"To scale the solution there are additional costs."
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Top Industries

By visitors reading reviews
University
8%
Comms Service Provider
7%
Computer Software Company
7%
Financial Services Firm
7%
Financial Services Firm
39%
Manufacturing Company
6%
Computer Software Company
6%
Government
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 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.
884,192 professionals have used our research since 2012.