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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 January 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 12.1%, down from 19.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Market Share Distribution
ProductMarket Share (%)
SQL Server12.1%
IBM Informix1.8%
Other86.1%
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

"It supports multiple applications and business intelligence tools."
"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."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"This solution has made financial reporting possible by allowing financial people the opportunity to set Informix to "Auto Pilot" so that they can attend other duties."
"The scalability is very good."
"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 stability is incredible. I have customers with uptimes of several years."
"The initial setup is pretty easy."
"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 solution is very common. It's easy to use."
"SQL Server is widely used and it's simple. You cannot do without Microsoft if you want to manage IT for a business customer."
"It can go easily on a virtual machine and be accommodated by a virtual machine easily. That is a plus, as not all databases can handle that."
"The product’s most valuable features are flexibility and scalability."
"It is a very user-friendly solution. It is easy to manage the databases and troubleshoot any issue. It is a perfect solution for the volume or transactions that we need to manage."
"The backups are excellent."
"Stability and usability, which is quite simple, are two of the solution's most valuable features."
 

Cons

"The support team could include local engineers to establish efficient communication. It will help us speed up the escalation process."
"This solution is in need of more current tools."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"The solution really doesn't add new features very often."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"I really would love to have a QT plugin."
"The technical support services need substantial improvement."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"The solution is expensive. The licensing costs are high."
"Microsoft could improve SQL Server by integrating the tools better."
"Only one CPU core can be used. Can’t move a database between servers easily. Can’t use triggers."
"Query optimitzer could be simplified."
"The solution could improve by being more user-friendly."
"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."
"SQL Server could improve the integration with nonrational database solutions, such as MongoDB."
"I would like to have the ability to restore backups in the next release."
 

Pricing and Cost Advice

"The product has reasonable pricing. We purchase its yearly license."
"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."
"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."
"There is an annual license and it is priced reasonably."
"This is a very cheap product."
"We are on a monthly subscription and the price could improve. However, the price has worked out well in some deployments. The problem is you never know what kind of services been installed and you have to be in touch with many people, such as which servers are active or which are not. I did face a couple of issues in terms of subscriptions and the pricing model. They have improved over time."
"It's cheaper than Oracle."
"As compared to Oracle Database, SQL Server is less expensive. For mid-sized organizations, SQL Server is completely all right, but people say it can't support large organizations with more than 2,000 users."
"I would rate the tool's pricing a six out of ten. It is not extremely cheap but also it's not the most expensive product."
"Historically, SQL Server has been much more affordable than Oracle, which is overpriced."
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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
7%
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: December 2025.
881,282 professionals have used our research since 2012.