About
Danny Riebeek. The SQL Server specialist.
Senior Microsoft SQL Server DBA and architect, hands-on since SQL Server 4.21 in 1993. Founder of DatabaseOnline, engineer behind SQLTreeo, and still on call.
More than thirty years on one platform, by choice
Danny Riebeek has worked with Microsoft SQL Server since 1993, when version 4.21 had just arrived on Windows NT and most estates were a single server under a desk. He started as a developer and database administrator, and found early on that the database was where the interesting problems lived: the slow report nobody could explain, the backup that had never been restored, the failover that had never been tried.
In 2001 he founded DatabaseOnline in Roosendaal, with a simple plan: be the people a company can call when the database is the problem, and be reachable when it matters. Twenty-five years later he still leads the company's SQL Server practice, still does the engineering himself, and still takes on-call shifts for the customers whose estates are monitored around the clock.
Along the way he built the tools he needed on customer servers and could not buy. SQLTreeo, the SQL Server Management Studio add-in that gives DBAs virtual folders and schema comparison, is used by database teams worldwide. He writes for the SQL Server community, is Microsoft Azure certified, and works in Dutch and English across the Netherlands, Belgium and, remotely, wherever a SQL Server is slow.
SQLServerSpecialist.nl is the direct line to him. One senior specialist, for organisations that want the person who has done this before rather than a bench of people who might.
- Hands-on since
- 1993SQL Server 4.21 through SQL Server 2025
- Founded
- DatabaseOnline, 2001Databaseonline B.V., Roosendaal, KvK 30171190
- Built
- SQLTreeoSSMS add-in used by DBAs worldwide
- Works
- NL, BE and remoteDutch and English, CET / CEST
In his own words
“The one promise a database partner cannot outsource is being there at three in the morning.”
When I started DatabaseOnline in 2001, the plan was simple: be the people a company can call when the database is the problem, and be reachable when it matters, which is rarely at ten in the morning. Twenty-five years later that is still the whole strategy.
I stayed specialised in Microsoft SQL Server because depth beats breadth when production is down. I built tools like SQLTreeo because I needed them myself. And I still take on-call shifts because a promise to be there at night is not one you can hand to a ticket queue.
SQLServerSpecialist.nl exists because a lot of organisations do not need a consultancy. They need one person who has seen their problem before, will tell them honestly what it takes, and will do the work. If that is what you are looking for, pick a slot in my agenda and bring the symptoms.
Danny RiebeekFounder and CEO, DatabaseOnline · the SQL Server specialist
Credentials
Credentials you can check, not just claim
Microsoft certification for the Azure work, more than thirty years of production SQL Server administration for everything else, and tools in daily use by other DBAs as the reference. Also certified Genesys Cloud Architect and Scripting Specialist, for the contact-centre data work done at DatabaseOnline.

Azure Fundamentals
built by Danny
since version 4.21
Tools he built
Software that started on a customer's server
Every product began as something needed during an engagement that could not be bought. They are sold and supported by DatabaseOnline.
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SQLTreeo
Virtual folders in SQL Server Management Studio, so hundreds of databases and objects become a structure a team can navigate. Plus SQLTreeo Compare for schema and data comparison.
sqltreeo.com -
SQLCompare
Compare two SQL Server databases, see every difference in schema or data, and generate a deployment script you can read before it runs.
via sqltreeo.com -
SSMSFolders
Put databases and SQL Agent jobs into custom folders in Management Studio, without touching the server.
ssmsfolders.com
Talk to Danny
Thirty minutes, free, technical. Pick a slot.
Bring the symptoms, the version and what changed recently. You leave with an opinion and, if you want one, a proposal.