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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

"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"Every version is faster than the previous."
"Replication is a valuable feature and easy to use."
"IBM Informix benefits users with high availability and good integration capabilities."
"So far, we do not have a lot of issues. It's pretty problem-free."
"It supports multiple applications and business intelligence tools."
"The solution's stability, performance, enhanced functionality, and replication are all great features."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"There was an online system in which we had about 2500 requests to the DB per second. Every request had a completion window of one second to process and retrieve data. After switching to SQL Server, and AlwaysOn, and Snapshot, and tinkering, and configuring and tinkering, the handling capacity we measured increased to about 5000 requests per second, while the time decreased to 0.5 seconds per request."
"If backups and alerts are configured properly, I can also rely on my restoration plan."
"One of the most valuable features of SQL Server is that it's easy to use."
"It integrates well with other platforms."
"Very easy to use, and it's very democratic in the enterprise."
"The product's initial setup phase was simple."
"The performance of the SQL Server is very good."
"Technical support is very good."
 

Cons

"I experienced poor input/output (IO) performance."
"Every month or every second month, we find some bugs in it, which is not ideal."
"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 solution really doesn't add new features very often."
"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."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"Right now we don't get much technical support from Microsoft"
"The configuration process can be a little complex."
"We want to move to Azure, and the solution could be made better to make the process easier for the migration from on-premise to the cloud."
"The Task Scheduler has a lot of shortcomings. This could be improved quite a bit."
"The web interface and the command line interface could be better so we could manage and build some things around an API. If we could build our own solution, our own interface, and then manage the solution through that open API, that would be better."
"The reporting services of the solution (SSRS and now Power BI) are the less valuable items of the SQL Server suite."
"SQL Server backups could be better."
"SQL Server could integrate better with other platforms."
 

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."
"The product has reasonable pricing. We purchase its yearly license."
"For me, it's always too expensive."
"It is expensive, but you get what you pay for."
"I don't know the exact prices because my focus is essentially technical and not on the bills. A few years ago, they changed the billing policy for the Enterprise Edition, and it became less attractive. But I believe they are still cheaper than Oracle. SQL Server isn't cheap, but it's not expensive either."
"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."
"For medium-sized customers who don't need some enterprise features, the tool would be available for 200 USD per month. For the enterprise segment, the tool's cost can go up to 6,000 USD."
"The free version is cumbersome to use and maintain. But $5000 for a licence is more expense than the benefit I would get from a licensed version. A licence might be worth the price to simplify management and speed up searches."
"The price of SQL Server could be better in the African market. The licensing model needs to be improved, it is confusing."
"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."
"The price of the solution is fine."
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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%
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.
883,824 professionals have used our research since 2012.