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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

"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."
"We don't have any problems with the Informix Database."
"It supports multiple applications and business intelligence tools."
"The initial setup is pretty easy."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"OLTP processing capacity and the availability of information with high availability implementation have been significantly improved."
"Not looking at Informix would really mean a shot in your own leg before walking a long distance."
"IBM Informix benefits users with high availability and good integration capabilities."
"It's great that the database engine is always on."
"The solution has proven to be very flexible, the product is quite stable, overall we've found it to be extremely easy to use, the initial setup is pretty straightforward, it's not difficult to implement and the deployment doesn't take too long, and technical support has been pretty good so far and they are helpful."
"SQL's performance is good enough if you have a low amount of data."
"The stability of SQL Server is very important for us because we provide services for banks."
"A great DBMS for organizations of all sizes."
"It's a very capable, efficient, price-performant OLAP server."
"We have found there are many useful features such as the solution is continually being upgraded, ETL capabilities for extracting and transformation, and it is very easy to use."
"Very pleasing and satisfying experience."
 

Cons

"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 technical support services need substantial improvement."
"The solution really doesn't add new features very often."
"This product could be made easier to use for beginners."
"The pricing is a bit expensive."
"I experienced poor input/output (IO) performance."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"The pricing of the product could be better."
"Third-party services from Redgate should be built-in to it, like SQL Search."
"This is a downside of enterprise Microsoft products."
"Performance could be improved."
"I would not recommend this solution."
"I have experience working with SQL Server 2016 and older versions, including handling JSON data. Initially, I found the JSON capabilities to be less helpful, but over time, they have greatly improved. SQL Server now offers extensive capabilities for working with various forms of data, particularly when communicating with text, such as in JSON format. I particularly prefer working with these features on Azure, as it provides numerous possibilities, especially in the field of business intelligence (BI). Additionally, the serverless platform offered by Azure is highly beneficial and makes tasks easier to manage."
"They have too many licensing options. They may want to simplify its licensing and bring it down to two, three, or four categories from ten to fifteen categories. Having so many different licensing options makes it difficult to decide which one to choose from. They can club things together. This is an area where they can make things easier for customers."
"The stability of the solution should be improved in the next release. Sometimes it is great, sometimes it is troublesome."
 

Pricing and Cost Advice

"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."
"The product has reasonable pricing. We purchase its yearly license."
"I am not aware of the licensing costs or terms."
"The price of SQL Server could be better in the African market. The licensing model needs to be improved, it is confusing."
"​We are a Microsoft shop, so we use Active Directory. That integrates well with this product, but we did look at Oracle. We also looked at IBM. This was the best price point for us for what we were getting.​"
"To scale the solution there are additional costs."
"The enterprise-level license agreement is very complicated."
"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."
"The cost associated with SQL Servers is on the higher side."
"Their options for concurrency and locking are good, as well as their prices."
"Our customers do pay license fees for the MS SQL Server but the Rabbit is free, as it is open-source software."
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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
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 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.
886,858 professionals have used our research since 2012.