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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

"It supports multiple applications and business intelligence tools."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"IBM Informix benefits users with high availability and good integration capabilities."
"Every version is faster than the previous."
"The stability is incredible. I have customers with uptimes of several years."
"The scalability is very good."
"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."
"So far, we do not have a lot of issues. It's pretty problem-free."
"The solution offers very high performance."
"Many developers like SQL Server."
"Very good security features."
"The fact that SQL Server fully integrates within the entire Microsoft ecosystem is a plus."
"You could have an offsite and an onsite, and if the onsite goes down, the offsite picks it up. I like that flexibility to provide continuing operations."
"The management studio is probably the thing we use the most for running quick queries and creating quick reports. Quite often, somebody comes and says, "Hey, can you find XYZ?" It is so much easier just to jump in there and run a quick query."
"I have experience with this product for many years. I never have problems with it. It can handle a PC, and it can also handle huge data. It is fast and efficient."
"SQL Server provides good performance. Most of the SQL solutions can be integrated and this solution is no different, you are able to link other databases. For example, we have Oracle running a Postgres Server and it is linked. It follows the ISO standard when it comes to commands, it works well."
 

Cons

"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"I really would love to have a QT plugin."
"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."
"I would like to see backups from secondary servers."
"This product could be made easier to use for beginners."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"This solution is in need of more current tools."
"The support team could include local engineers to establish efficient communication. It will help us speed up the escalation process."
"Sometimes, the tool doesn't support all the native features, and because of this, our company has to customize it to meet our requirements, which is a challenging process for our company's engineers."
"The free version of SQL Server is time-limited before updating to the paid version."
"On the SQL Server Management Studio (SSMS) side, I have noticed more bugs in terms of being able to connect to our SQL servers. I can't tell how many times my recent server list got dropped or cleaned out. It is a pain, and it would be nice to have that recent connect list when you connect in. For whatever reason, once in a while, I get a hard error, and it'll close. When I go back in, everything is cleared out. It is annoying when you are working with more than a hundred database instances."
"Its security can be improved. When you look at the Windows environment, it isn't the most secure environment. It is exposed to so many attacks. They continuously need to improve the security of the platform on which it sits."
"There was a time when Microsoft support provided very crisp answers, but over time, they have diluted their support to third parties, leading to a drop in support quality, which restricts me from giving a perfect 10, as post-sales service is crucial."
"Its support for JSON should be improved. It does support JSON, but the support is not good enough currently. They should also improve the way indexes work. Its performance can also be improved because sometimes it becomes very slow for certain table designs. It cannot have more than a certain amount of data. As compared to other databases, its capability to handle large volumes of data is not very good."
"With so much data, things can get slow, which is why I would like to be able to understand how to better optimize queries."
"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

"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."
"There is a license required for servers and for the POS we use the free version. The free version allows you to have tables and a total database size of approximately 10 GB, which is enough for our requirements."
"This is a downside of enterprise Microsoft products."
"The price of the solution could be reduced, it is expensive."
"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 cost is high and because it's an expensive product, we are in the process of moving towards open-source solutions."
"As compared to Oracle Database, SQL Server is less expensive. For mid-sized organizations, SQL Server is completely all right, but people say it can't support large organizations with more than 2,000 users."
"The product’s price depends on the specific server requirements."
"The enterprise-level license agreement is very complicated."
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Top Industries

By visitors reading reviews
Financial Services Firm
9%
Computer Software Company
8%
University
8%
Comms Service Provider
7%
Financial Services Firm
38%
Computer Software Company
7%
Manufacturing 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 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: February 2026.
881,565 professionals have used our research since 2012.