This article documents a SQL injection vulnerability I discovered in sys.sp_dbmmonitorupdate, a Microsoft-signed system stored procedure. For other SQL Server security vulnerabilities I’ve discovered, see the full series here.
2026-07-22
Large databases usually have a negative impact on maintenance time, scalability and query performance. For maintenance, these large single databases have to be backed up daily while the amount of actual changing data might be small. For performance, tables without correct indexes result in full table or clustered index scans. As the data grows the total query time increase linearly. How can we decrease downtime for the maintenance window for large databases and optimize the performance of daily queries?
2026-07-20
Learn how to use VECTOR_DISTANCE and VECTOR_SEARCH in SQL Server to find semantically similar data.
2026-07-17
I work with databases for a living. I teach people, and I help them via consulting. And as far as I can remember, I’ve never written something about how b-trees work.
2026-07-15
This article examines three recurring database-layer failures documented in the EDPB’s 2026 enforcement findings: the complexity of executing erasure across relational schemas, the backup paradox that can silently undo compliant deletions, and the audit log contradiction that traps organizations between two competing obligations.
2026-07-14 (first published: 2026-07-13)
We had an issue with a SQL Server database in an Always On Availability Group (AOAG) where it was not synchronizing the secondary replica even though it was using the “Synchronous commit” Availability Mode for the secondary replica. This article explains how to troubleshoot and resolve:
2026-07-10
Learn how to call locally hosted Ollama embedding models from SQL Server using sp_invoke_external_rest_endpoint
2026-07-08
In a previous tip on Orphaned User Detection for SQL Server High Availability Databases, we have seen how to identify when there are orphaned database users in an Availability Group database. Is there a way where we no longer need to worry about missing database users or different SID values between primary and secondary databases in an Availability Group?
2026-07-06
From the Air Canada chatbot lawsuit to the infamous Chevy dealership pricing fiasco, this article breaks down the six real reasons RAG systems fail in production – and the five architectural patterns high-performing AI teams use to make them trustworthy, grounded, and production-ready.
2026-07-03
I have a 2-node failover cluster instance running on Windows Server 2019 Standard edition. I have a requirement to add a new SAN disk to the SQL Server failover cluster instance (FCI), and then I need to move a user database to that newly added shared disk. Can you show the steps required to add a new disk to the FCI and move the user database?
2026-07-01
By James Serra
If you are migrating a data warehouse, there is a question worth asking before...
By Steve Jones
I’m back from a great vacation. I had the chance to visit two new...
Introduction I was experimenting with vector search in SQL Server 2025 using approximately 3.8...
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How many types of DML triggers are there?
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