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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) (4th)
 

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 scalability is very good."
"Replication is a valuable feature and easy to use."
"The initial setup is pretty easy."
"It supports in-house-built applications in .NET and VB6"
"The solution's stability, performance, enhanced functionality, and replication are all great features."
"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."
"IBM Informix benefits users with high availability and good integration capabilities."
"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"I find query optimization to be highly valuable for data management. Additionally, drag-and-drop query creation greatly facilitates data management tasks."
"The initial setup is time-efficient and can be done independently."
"The most valuable feature would most likely be querying. We query a lot, we use a lot of stored procedures. As for other features, such as replication and all other more fancy features we don't use them the most. I do not know, but perhaps the DBAs would be the best people who know of the features that they use, but as far as how I use it, it's just for querying and running stored procedures. We use the bare minimum features."
"SQL Server is widely used and it's simple. You cannot do without Microsoft if you want to manage IT for a business customer."
"We have found the solution valuable because we are able to easily create a query, shrink, backup, and make new tables."
"SQL Server is quite user-friendly. I have experience with Oracle and PostgreSQL, so out of three, I like SQL Server a lot."
"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."
"I like that the new version has a memory-optimized table to improve the performance."
 

Cons

"I experienced poor input/output (IO) performance."
"This solution is in need of more current tools."
"This product could be made easier to use for beginners."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"Every month or every second month, we find some bugs in it, which is not ideal."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"The solution lacks some functionality."
"I really would love to have a QT plugin."
"We would like to have a common storage option in the SQL Server. This option is available in Oracle Database. It would be great if Microsoft could create something like a columnstore that has not only indexing but also tables for common storage."
"The way to make cursors and manage raw data in rows can be improved. Currently, the way to construct or build these cursors is very hard, and you can waste memory. You need a highly skilled person to make it more efficient. It can also have support for Cubes, which is the organization of data in different dimensions by using MDX languages."
"Security is an area that can be improved."
"They do not offer the SQL Server Management tool via the installation. It is a separate tool I use when I'm trying to configure the mirroring with SQL Server Mirroring. This is not supported and I'm getting some errors on the database mirroring."
"CAL licenses should cost less. Microsoft usually prices high for client access licenses. Server plus user client access license (CAL) licensing requires a separate Server license for each server on which the software is installed, plus a user CAL for each user accessing the server."
"The solution could be better integrated with the SQL Server Studio tool."
"The performance needs some improvement and it needs more features integrated into it."
"Price could be cheaper, and access to reporting tools should be better."
 

Pricing and Cost Advice

"I am not aware of the licensing costs or terms."
"The product has reasonable pricing. We purchase its yearly license."
"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 price could always be lower."
"We are on an annual enterprise license for the solution and the cost of the license could be reduced."
"Synapse is a bit costly. If I compare it with different databases, I think it's a reasonable price"
"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."
"We pay per second of usage, but there are different offerings of the license."
"It is expensive."
"SQL Server is an expensive solution."
"We pay approximately $12,000 USD per month for both the server and the license."
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Top Industries

By visitors reading reviews
Financial Services Firm
9%
University
9%
Computer Software Company
9%
Manufacturing Company
7%
Financial Services Firm
39%
Computer Software Company
7%
Manufacturing Company
7%
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 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.
881,082 professionals have used our research since 2012.