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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 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 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 solution's stability, performance, enhanced functionality, and replication are all great features."
"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."
"OLTP processing capacity and the availability of information with high availability implementation have been significantly improved."
"The stability is incredible. I have customers with uptimes of several years."
"Informix can support huge quantities of data with less memory and less capacity."
"It supports multiple applications and business intelligence tools."
"Every version is faster than the previous."
"The solution is valuable because it seamlessly extracts reports and enables the collection of information from different tables."
"Comparing with other database management systems that I tried in other companies, SQL Server is quite easy to install, configure, and maintain."
"Its availability for a secured server is one of its most valuable features. Also its replications - we can manage eight replicas. Their clustering and availability groups are also valuable."
"The Azure SQL Server database requires almost zero maintenance and management."
"SQL Server is very powerful and useful when you need to store, retrieve, process, and analyze a large amount of data."
"It's great that the database engine is always on."
"Their integration, SSRS and SSIS tools are really good."
"As an engineer working for multiple organisations, MS SQL has proven stability and operational power."
 

Cons

"The solution lacks some functionality."
"The solution doesn't include functionality like data anonymization."
"This solution is in need of more current tools."
"For me, it's always too expensive. The problem is that Informix sometimes competes with free products, so yes, it's very expensive, but when we're talking about licensed products like SQL Server or anything, the midsize pricing could be significantly improved."
"The support team could include local engineers to establish efficient communication. It will help us speed up the escalation process."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"This solution is in need of more current tools."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"With so much data, things can get slow, which is why I would like to be able to understand how to better optimize queries."
"It will be very useful to have high-level database monitoring. It should also have built-in business intelligence reporting."
"The solution could offer better integration with other solutions - specifically Microsoft."
"Due to the fact that I'm dealing with the product more as a data analyst, the SQL Server management studio is really relatively primitive compared to other more advanced tools."
"The solution has legacy issues when it comes to compatibility."
"There was a time when Microsoft support provided very crisp answers, but over time, they have diluted their support to third parties, leading to a drop in support quality, which restricts me from giving a perfect 10, as post-sales service is crucial."
"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."
"Price could be cheaper, and access to reporting tools should be better."
 

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."
"It is expensive in terms of licensing costs and pricing. If you want to scale SQL Server, it is very expensive. We probably have to pay extra for technical support. We also have to pay for the license of Windows on which the SQL Server resides, which is an extra cost."
"The licenses are really expensive. Their licensing model should be more simplistic."
"It is expensive, but you get what you pay for."
"To scale the solution there are additional costs."
"Our customers do pay license fees for the MS SQL Server but the Rabbit is free, as it is open-source software."
"There is an annual license and it is priced reasonably."
"​It has the easiest licensing."
"Its licensing is yearly. There are no additional costs. There is only the subscription license."
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Top Industries

By visitors reading reviews
Construction Company
9%
Comms Service Provider
8%
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 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.
885,444 professionals have used our research since 2012.