SQL Server Performance & Troubleshooting – Where Milliseconds Matter 🚀

Before we dive into today's topic, if you missed my previous post you can take a look at SQL SERVER 2025 CU5: Bug Reference 5090650, fixes issue in which an EntryPointNotFoundException for GetNumaNodeProcessorMask2 . 👉 If you found this deep-dive helpful, feel free to check out the ads—your support helps me keep creating high-quality SQL Server content for the community. 💣 What Is an XXE Attack and Why Should SQL Server DBAs Care? XML vulnerabilities are not just a web developer problem anymore. XXE attacks can directly impact SQL Server environments, SSIS packages, SSRS reports, and XML parsing workflows. ⚡ SQL Server Security 🧠 XML Parser Internals 🚀 SSIS & SSRS Risks 💣 XXE Vulnerability ⚡ The Hook In this post, I’ll show you exactly what an XXE (XML External Entity) attack is, why it still matters today, and how it can directly affect SQL Server environments through SSIS, XML processing, and SSRS. If ...

Before we dive into today's topic, if you missed my previous post you can take a look at SQL SERVER 2025 CU5 (Cumulative Update 5) Is OUT! A Hot Take on the New Features for DBAs 👉 If you found this deep-dive helpful, feel free to check out the ads—your support helps me keep creating high-quality SQL Server content for the community. SQL SERVER 2025 Optional Parameter Plan Optimization (OPPO) What It Is and Benchmarks — Internal Part 1 Series ⚡ SQL Server 2025 finally attacks one of the oldest performance killers: optional parameter queries and unstable execution plans. 🧠 In this post you will learn how OPPO works internally, why it matters for parameter-sensitive workloads, and how to benchmark it yourself with real T-SQL tests. 🧠 TL;DR BOX ✔️ SQL Server 2025 OPPO automatically creates multiple execution plan variants for optional parameter queries ⚡ ✔️ OPPO is part of Intelligent Query Processing and reduces parameter-sensitive plan issues 💣 ✔...

Before we dive into today's topic, if you missed my previous post you can take a look at Check SQL Server Plan Cache Pollution (III) in 45 Seconds, The "45 Seconds DBA Series" | Part 24 . 👉 If you found this deep-dive helpful, feel free to check out the ads—your support helps me keep creating high-quality SQL Server content for the community. SQL SERVER 2025 CU5 (Cumulative Update 5) Is OUT! A Hot Take on the New Features for DBAs ⚡ Critical fixes. Security patches. In-Memory OLTP improvements. Full-Text Search upgrades. This CU is not just maintenance — it directly impacts performance stability and production reliability. In this post, I’ll show you what really matters inside SQL Server 2025 CU5, why some fixes are potentially production-saving, and what every DBA should immediately validate after patching. ⚡ We will also see practical T-SQL examples you ...

Before we dive into today's topic, if you missed my previous post you can take a look at  Check Parallelism Issues in 45 Seconds. From Symptoms to Root Clause. The "45 Seconds DBA Series" – What Real DBAs Check First | Part 10 🥇" . 👉 If you found this deep-dive helpful, feel free to check out the ads—your support helps me keep creating high-quality SQL Server content for the community. SQL Server 2025 Has AI Functions… But Not Where You Think What if I told you that SQL Server can now generate embeddings and chunk text… directly in T-SQL? 👉 It’s true. 👉 But also misleading. ⚡ TL;DR (Reality Check) ✔️ AI functions exist (AI_GENERATE_CHUNKS / AI_GENERATE_EMBEDDINGS) ✔️ They are real T-SQL functions ❗ But they work ONLY in cloud-enabled environments ❗ Not fully available in standard SQL Server on-prem ✔️ SQL Server is becoming an AI orchestrator, not an AI engine 🧠 The Illusion You may have seen code like this: SELECT C.chunk_id, ...

Before we dive into today's topic, if you missed my previous post you can take a look at SQL Server 2025 CU4: Full-Text Search Strikes Again! Deep Troubleshooting. Test Day 4 . 👉 If you found this deep-dive helpful, feel free to check out the ads—your support helps me keep creating high-quality SQL Server content for the community. 💣 SQL Server 2025 CU4: Are Your Queries Lying to You? The Hidden Full-Text Search Trap (Test Day 5) ⚡ The Hook In this post, I’ll show you how SQL Server can return wrong results without throwing any error . If you rely on Full-Text Search , this can silently corrupt your logic and your business decisions. ⚡ TL;DR ✔️ Full-Text Search can return incomplete or incorrect results without errors 💣 ✔️ Language (LCID) mismatch breaks stemming silently ⚠️ ✔️ Parser output may differ from actual query results 🧪 ✔️ Always validate configuration, not just query execution ✔️ 🧠 Intro Hi SQL SERVER Guys, Today fast and focused post ! We a...