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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

"Replication, all levels of replication, query charting, and the MongoDB embedded are the most valuable features of this solution."
"The initial setup is very simple."
"Replication is a valuable feature and easy to use."
"Every version is faster than the previous."
"The scalability is very good."
"Not looking at Informix would really mean a shot in your own leg before walking a long distance."
"The initial setup is pretty easy."
"My advice is to take it; you will never regret it."
"SQL Server is a good solution for me."
"The stability is fine, especially if you're hosting it on AWS or Azure. You can get up to 99.99% stability on AWS."
"The solution is extremely stable; we haven't had issues, we don't really experience bugs or glitches, and we haven't had the system crash on us before."
"The solution is highly scalable; you are able to implement a SQL cluster mechanism for replicating the data between two nodes of the SQL Server so if one of the nodes is down the second node becomes active."
"It is a very user-friendly solution. It is easy to manage the databases and troubleshoot any issue."
"It is stable, and it works okay."
"There was an online system in which we had about 2500 requests to the DB per second, and after switching to SQL Server, AlwaysOn, and Snapshot, 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."
"Having everything in one centralized set of databases is the most valuable feature."
 

Cons

"Informix is very sturdy, but the problem for us is the marketing action around Informix."
"It would be helpful to have IBM salespeople know that Informix exists, and sell it. Currently, it is completely ignored by IBM."
"The pricing is a bit expensive."
"The solution doesn't include functionality like data anonymization."
"I would like to see backups from secondary servers."
"Continue extending the SQL language for compatibility with the competition's language, including Stored Procedure Language."
"The solution really doesn't add new features very often. Other solutions are much more actively pushing out upgrades and improvements."
"This product could be made easier to use for beginners."
"The price could be better: Compare to Oracle it is cheaper but with the existence of many open source databases currently in the market, consider reducing the Licensing cost."
"The Standard Edition and Enterprise Edition have certain limitations."
"The solution could improve by being more user-friendly."
"Occasionally the performance, as good as it is, is a bit off. We sometimes experience memory spiking. If they could maybe fix that aspect of the solution, that would be quite helpful for our organization."
"More things in SQL Server need to be automated."
"Sometimes, when you have a lot of information running on the SQL databases, the system hangs."
"Maintenance of the solution is an area of concern, and improvements can be helpful."
"The solution is lacking a compound index for comparing values."
 

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."
"The product has reasonable pricing. We purchase its yearly license."
"For me, it's always too expensive."
"I am not aware of the licensing costs or terms."
"Although it comes with a cost, using the most recent version is highly advisable, since it would ensure a certain measure of bug fixes and stability. The sole issue would involve the cost, as this is expensive."
"Cost is a major derivative for any organization. It has a reasonable cost value, and its cloud support is also better than others. Comparatively, Oracle can do the same things or is even better in certain areas, but it is expensive. The cost along with the support are the plus factors for SQL Server."
"We did a one-time payment. Its price, in general, can be reduced."
"Its price is fine. You have to buy the license and support."
"Their options for concurrency and locking are good, as well as their prices."
"The price could always be lower."
"SQL Server is an expensive solution."
"I know the SQL Server pricing model, I believe, is based on CPU cores that your database server has, but I don't know what the solution's prices are though."
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Top Industries

By visitors reading reviews
Comms Service Provider
9%
Construction Company
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 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: April 2026.
886,858 professionals have used our research since 2012.