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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) (4th)
 

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

"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 solution's stability, performance, enhanced functionality, and replication are all great features."
"It supports in-house-built applications in .NET and VB6"
"IBM Informix benefits users with high availability and good integration capabilities."
"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 most valuable feature is concurrency and locking because my customers usually use databases in OLTP mode. So, for a large number of competitive users. Other features that are well valued are quick large-scale data types. It is better than Oracle."
"The stability is incredible. I have customers with uptimes of several years."
"SQL Server stands out due to its robust parallel processing capabilities."
"SQL Server is a good solution for me."
"The availability is the most valuable feature. It has high availability. It also has good performance."
"I have experience with this product for many years. I never have problems with it. It can handle a PC, and it can also handle huge data. It is fast and efficient."
"The solution has a user-friendly environment and supporting functionalities. It also has great memory and processing databases."
"The most valuable feature is replication because we had several replicas of the SQL Server database in different geographical locations."
"I have found that SQL Server works very well in the Microsoft Dynamics environment."
"The solution has a reliable database."
 

Cons

"The solution lacks some functionality."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"The technical support services need substantial improvement."
"This product could be made easier to use for beginners."
"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."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"This solution is in need of more current tools."
"Something that could be improved is the cost because it's very high. That's the only thing I'm concerned about but the technology is good."
"The solution’s initial setup could be complex, requiring some design of how you want to lay everything out and what type of storage you want to put certain things on."
"Microsoft support is an issue unto itself."
"I would like the SQL Server to be able to provide cloud support. We use the solution with a Korean provider supporting only MySQL rather than Microsoft SQL Server, which would be preferable and cheaper. This would prevent us from having to pay for troubleshooting and hosting the server."
"SQL Server has good performance, but it could be better."
"If SQL Server could perhaps run on Linux, that would be good. Most of us prefer Linux and I've used a lot of Linux. I understand that SQL Server is quite powerful, but I'm not sure if the functionality is there, but if it could be used in an open-source type of environment, it would be very good."
"I would like to see the performance improved. Migrating should be easier and the scalability needs improvement."
"It can be better if it enables the use of AI functions."
 

Pricing and Cost Advice

"I am not aware of the licensing costs or terms."
"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."
"This is a very cheap product."
"It's cheaper than Oracle."
"Depending upon your usage, you can use the pay-as-you-go model for a short period of time. For longer projects, we can opt for one-year or a three-year license."
"The price could be cheaper."
"The cost is high and because it's an expensive product, we are in the process of moving towards open-source solutions."
"With recent releases, the Standard Edition (cheaper) SKU has some of the earlier version Enterprise features. SQL Express has some limitations."
"The enterprise-level license agreement is very complicated."
"For our purpose, we are not required to have a license for what we are using it for."
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Top Industries

By visitors reading reviews
Financial Services Firm
9%
Computer Software Company
9%
University
9%
Comms Service Provider
7%
Financial Services Firm
39%
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.
881,346 professionals have used our research since 2012.