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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 February 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 11.8%, down from 19.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Market Share Distribution
ProductMarket Share (%)
SQL Server11.8%
IBM Informix1.8%
Other86.4%
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 stability is incredible. I have customers with uptimes of several years."
"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"It supports multiple applications and business intelligence tools."
"IBM Informix benefits users with high availability and good integration capabilities."
"It supports in-house-built applications in .NET and VB6"
"Every version is faster than the previous."
"Replication is a valuable feature and easy to use."
"The installation is really easy."
"SQL Server is a stable product."
"The support from Microsoft has been good."
"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."
"Enables us to convert to bigger DBs and more easily move or upgrade between branches."
"The product can scale if a company needs it to."
"It's a flexible solution."
"The most valuable features of this solution are easy queries and straightforward programming for beginners."
 

Cons

"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"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 really doesn't add new features very often."
"This product could be made easier to use for beginners."
"I really would love to have a QT plugin."
"Every month or every second month, we find some bugs in it, which is not ideal."
"I experienced poor input/output (IO) performance."
"An area for improvement would be the SQL Server process monitoring, which is quite basic and could sustain more information."
"SQL Server could improve the integration with nonrational database solutions, such as MongoDB."
"The main area of SQL Server that can be improved is the price. The cost is substantial for using the tool."
"Security is an area that can be improved."
"The solution could offer more integration with other platforms."
"Performance could be improved."
"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 could be more stable."
 

Pricing and Cost Advice

"The product has reasonable pricing. We purchase its yearly license."
"For me, it's always too expensive."
"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."
"SQL Server is an expensive solution."
"I rate the product’s pricing a six out of ten."
"The areas that need improvement are with regards to the commercial aspect of the solution, the licensing cost could be reduced in order to help customers to adopt it."
"The price of SQL Server could be better in the African market. The licensing model needs to be improved, it is confusing."
"The price for the Standard Edition is approximately $3,000 USD per core. Once you include technical support, SQL Server is cheaper than PostgreSQL and MySQL."
"For our purpose, we are not required to have a license for what we are using it for."
"For a brief period, approximately one year before 2018, I had experience working with the open-source version of SQL Server. During that time, I found SQL Server to be the preferred choice, in my opinion."
"Licensing fees are paid on a yearly basis."
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Top Industries

By visitors reading reviews
Comms Service Provider
8%
Computer Software Company
8%
University
8%
Financial Services Firm
8%
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: February 2026.
882,886 professionals have used our research since 2012.