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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

"The scalability is very good."
"The solution's stability, performance, enhanced functionality, and replication are all great features."
"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."
"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 initial setup is pretty easy."
"Replication is a valuable feature and easy to use."
"The pricing of the product is very good."
"Very stable relational database management system that offers ease of management, querying, and scaling. It has well-designed databases."
"It's a flexible solution."
"SQL Server's performance is fine."
"It is an extremely stable solution."
"The solution can be deployed in a few minutes."
"Its usability is very good. Its performance is satisfactory."
"It is easy to deploy and easy to maintain."
 

Cons

"I would like to see backups from secondary servers."
"The pricing is a bit expensive."
"I really would love to have a QT plugin."
"This solution is in need of more current tools."
"The solution really doesn't add new features very often."
"I experienced poor input/output (IO) performance."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"The technical support services need substantial improvement."
"The solution could offer more integration with other platforms."
"The stored procedure integration with our development could be better. Things are always changing very fast at Microsoft, and it takes a lot of resources to get on top of it. We're struggling with version control. In terms of new features, we don't have any feature requests. We are not focusing on the database."
"I would like to see better integration between their link server and other platforms, such as IBM."
"I would like to see native plugins built for other platforms versus having to buy third-party plugins to tap into S3 buckets and AWS Cloud. Right now, it does not have those built-in plugins."
"The solution is lacking a compound index for comparing values."
"The price could be better. It costs a lot, and competing databases like Postgres are free."
"I do not think SQL Server is suited for a typical database warehouse environment. However, people do use SQL Server for data warehouse environments but the best use case is for very small databases. If somebody wants to store more than 10 TB of data querying then the performance really degrades. The performance should be improved in the future to allow more scalability."
"SQL Server is an expensive solution"
 

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."
"There is a license to use this solution. However, the model is not easy to understand. There is a guide you have to read about all the information on how it works. If you read this documentation, you can understand how it works. We are paying for our SQL Servers by CPU cores with an enterprise license."
"There is a license required for the use of SQL Server and we are on an annual subscription."
"It's cheaper than Oracle."
"The product is expensive."
"SQL Server is an expensive solution."
"The licensing involves a one time fee."
"It is annual."
"I don't need a license for it as I will be migrating to Office 365."
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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%
Government
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.
884,328 professionals have used our research since 2012.