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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
25th
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
6.6
Number of Reviews
274
Ranking in other categories
Database Management Systems (DBMS) (2nd)
 

Mindshare comparison

As of August 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 10.4%, down from 16.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Relational Databases Tools Mindshare Distribution
ProductMindshare (%)
SQL Server10.4%
IBM Informix1.8%
Other87.8%
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 scalability is very good."
"We don't have any problems with the Informix Database."
"It is very easy to install IBM Informix, very easy to scale, and support is quite better."
"The stability is incredible. I have customers with uptimes of several years."
"Informix can support huge quantities of data with less memory and less capacity."
"Replication is a valuable feature and easy to use."
"So far, we do not have a lot of issues. It's pretty problem-free."
"Overall, we've had a positive experience with the solution."
"The Microsoft SQL Server is a great and powerful data storage capable to provide many functionalities starts on free version until the power with BI resource and mirroring."
"It's great that the nodes are synchronized so if you lose one it automatically moves to another."
"The solution is very easy to use; it's intuitive and easy to navigate, and overall it's a straightforward product."
"The solution is great for creating backups."
"We use it for our on-premises solutions, virtual servers and SSAS, SSRS packages. Also, our applications are .NET based, so it made to use it."
"SQL is our main data store for enterprise applications, all applications that we have in the organization."
"In summary, this is a good product and I recommend it."
 

Cons

"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 lacks some functionality."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"There should be more intelligence surrounding discovering data to be able to automatically create indexes."
"The product needs a lot more marketing involvement from IBM."
"The solution should offer replication. It would be helpful if the solution would allow us to access third-party tools."
"For me, it's always too expensive. The problem is that Informix sometimes competes with free products, so yes, it's very expensive, but when we're talking about licensed products like SQL Server or anything, the midsize pricing could be significantly improved."
"I experienced poor input/output (IO) performance."
"The solution’s initial setup could be complex, requiring some design of how you want to lay everything out and what type of storage you want to put certain things on."
"If you have a lot of data and you want to perform computations on it, you will have problems and the performance will be degraded."
"When we are talking about event space architecture, scalability generally comes into play. For example, I might have a hundred thousand transactions a second, and then all of a sudden, I build something that everybody in the world wants. The next thing I know is that I have a million transactions a second. So, to be able to process the throughput, I'd have to scale up, and then when the holidays are over, I'm again down to a hundred thousand transactions, and I want to scale back down. SQL Server is not going to do that. In this way, it is not very scalable. One of the reasons why they want us to use Kafka is so that if we need to, we can do that, but our base program is on SQL Server. So, this is where we would use a Kafka event stack so that if I need more servers, I can just write a command, and I can have more consumers, more brokers, and more producers, and when the holiday season is over, it scales right back down again. SQL Server is not going to do that."
"If there is flapping of Always-On database node, SQL Server will break the replication to the child nodes, and it requires manual intervention to restart replication."
"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."
"Since this is a relational order system, scalability has a limit. If your system is very big, you need bigger servers and you have to spend more money. We scale a system up to a certain level, and then we move or shift data to the warehouse, which is NoSQL. We then do not have any bottleneck in scaling. For using this technique we are happy with it."
"Technical support could be better."
"I would like to have a more directed modeling, to have the flexibility to design all databases using a graphic interface."
 

Pricing and Cost Advice

"I am not aware of the licensing costs or terms."
"The product has reasonable pricing. We purchase its yearly license."
"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."
"For licensing, we pay yearly. The licensing is very expensive, and it should be cheaper."
"The price of the solution could be reduced, it is expensive."
"Pricing is reasonable for small organizations, but the scaling increases the price."
"We didn't have any licensing costs for SQL Server."
"We have an enterprise license, which we consider to be fine."
"It is something we have been using for a lot of years. If we're paying, it should be reasonable."
"We purchased our license and the pricing is fine for us."
"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."
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Top Industries

By visitors reading reviews
Construction Company
12%
Comms Service Provider
9%
Financial Services Firm
8%
Manufacturing Company
7%
Financial Services Firm
36%
Construction Company
7%
Manufacturing Company
6%
Outsourcing Company
6%
 

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 Enterprise118
 

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: August 2026.
908,834 professionals have used our research since 2012.