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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
24th
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 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

"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."
"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."
"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."
"Every version is faster than the previous."
"It supports multiple applications and business intelligence tools."
"Replication is a valuable feature and easy to use."
"It supports in-house-built applications in .NET and VB6"
"Stability is one of the most valuable features."
"It is a typical database solution, and it is working well so far. It is easy to use, and it is also very common and popular, which makes it easy to find a support partner."
"The solution is very common. It's easy to use."
"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."
"It is integrated with Microsoft tools."
"Agent service is a good feature of SQL Server, where you can schedule certain tasks."
"The solution offers very high performance."
"It is quite reliable in cluster configurations and has helped me to reduce downtime and improve SLAs."
 

Cons

"This solution is in need of more current tools."
"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."
"The technical support services need substantial improvement."
"I experienced poor input/output (IO) performance."
"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."
"The solution lacks some functionality."
"The solution really doesn't add new features very often."
"We pay a license fee, it could always be cheaper."
"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 needs to be more secure. It's lacking, compared to, for example, Oracle."
"They could improve by adding the SQL format."
"Indexing, as well as integration, are areas of this product that need improvement."
"The interface integration could be better."
"There should be more tools and documentation for tuning the performance of Microsoft SQL Server. It would be nice to have more tools for tuning because currently, all the tuning that we have to do with our databases is almost manual. We have to read a bunch of knowledge base articles, and this information should be better documented. Its free text search should also be improved. It is quite important for us. Currently, we're developing our own free text search because of the lacking flexibility in Microsoft SQL Server. Therefore, we're kind of using elastic search and making different implementations in order to reach our targets. Using just the native free text search of Microsoft SQL Server is not enough for us. It should have more flexible features as compared to the current version."
"Their support could be better. There should be more visibility on the progress of the ticket, and their last line of support should be more knowledgeable. Other than that, we have nothing to complain about."
 

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."
"On a scale of one to ten, when one is cheap and ten is an expensive solution, I rate the product price as seven. The product is expensive."
"The SQL server is affordable. I rate the pricing a five out of ten."
"It is expensive, but you get what you pay for."
"The price has been going higher and higher. The market is quite price sensitive."
"We are on an annual enterprise license for the solution and the cost of the license could be reduced."
"SQL Server is an expensive solution."
"We pay per second of usage, but there are different offerings of the license."
"The licenses are really expensive. Their licensing model should be more simplistic."
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Top Industries

By visitors reading reviews
Financial Services Firm
9%
University
9%
Computer Software Company
9%
Manufacturing Company
8%
Financial Services Firm
28%
Computer Software Company
9%
Manufacturing Company
8%
Government
5%
 

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.
879,422 professionals have used our research since 2012.