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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 (9th)
SQL Server
Ranking in Relational Databases Tools
1st
Average Rating
8.4
Reviews Sentiment
6.6
Number of Reviews
274
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 1.8% compared to the previous year. The mindshare of SQL Server is 11.2%, down from 17.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Mindshare Distribution
ProductMindshare (%)
SQL Server11.2%
IBM Informix1.8%
Other87.0%
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 initial setup is very simple."
"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."
"OLTP processing capacity and the availability of information with high availability implementation have been significantly improved."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"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."
"Overall, this is a great product. It works really well, is very stable, and is very scalable."
"The initial setup is pretty easy."
"Replication is a valuable feature and easy to use."
"All our healthcare projects are using the SQL Server, and we're able to load millions of data without any issues."
"Very easy to use, and it's very democratic in the enterprise."
"It provides the best performance and an easy way to monitor and troubleshoot problems."
"It's a good option for those that have a lot of Microsoft solutions in use."
"This solution has given us high levels of productivity, which has allowed us to use an Agile approach to the design and implementation of DW solutions for our customers, and this Agile approach has in turn given us a competitive advantage in our market."
"SQL Server, with its enterprise features, offers low cost in comparison to Oracle, while PostgreSQL, though an emerging technology, is not an enterprise-level solution and has flaws, making SQL Server the most cost-effective with good human resource availability to manage it."
"The most valuable features are ease of use and the integration with Single Sign On (SSO), as well as with other Microsoft products."
"You can load it up and start using it from the very minute it is implemented."
 

Cons

"The support team could include local engineers to establish efficient communication. It will help us speed up the escalation process."
"This product could be made easier to use for beginners."
"The pricing is a bit expensive."
"The solution lacks some functionality."
"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 solution doesn't include functionality like data anonymization."
"The solution really doesn't add new features very often."
"I experienced poor input/output (IO) performance."
"The solution is expensive. The licensing costs are high."
"Most of the large banks are shifting from SQL Server to Oracle Database because of its slowness."
"I would like to see the database become fully automated."
"The solution is lacking a compound index for comparing values."
"The solution could be more secure."
"It needs to be improved to handle big data for large volumes of transactions for big industries. As compared to Oracle Database, SQL Server is not suitable for big data or large organizations where the database size could be more than 100 GB or more. In our country, for a large database and a large volume of transactions, we normally use Oracle Database. Most of the large banks are shifting from SQL Server to Oracle Database because of its slowness."
"The stability of the solution should be improved in the next release. Sometimes it is great, sometimes it is troublesome."
"Running multiple instances on the same box would be beneficial."
 

Pricing and Cost Advice

"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."
"I am not aware of the licensing costs or terms."
"The product has reasonable pricing. We purchase its yearly license."
"It's a bit expensive."
"The licensing is on an annual basis."
"The enterprise-level license agreement is very complicated."
"The price could be better. Aside from the basic features, if you need any additional features that can be extended, for example, if you want to connect with the heterogeneous databases, they are being managed as separate services and not included in the package. If you manage a database in Azure, it's not providing SFS and reporting services. However, on-premises, if you purchase the SQL Server license, it includes SFIS and SFRS services. If you take Postgre SQL and MySQL, they provide almost all the same features even though they are both open source databases."
"The price of SQL Server could be reduced, the license is expensive. We have an annual subscription."
"SQL Server is a cost-effective solution for a small database."
"For our purpose, we are not required to have a license for what we are using it for."
"Synapse is a bit costly. If I compare it with different databases, I think it's a reasonable price"
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Top Industries

By visitors reading reviews
Construction Company
8%
Comms Service Provider
8%
Financial Services Firm
8%
University
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 Enterprise60
Large Enterprise117
 

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: April 2026.
886,468 professionals have used our research since 2012.