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 "Check SQL Server Plan Cache Pollution (II) in 45 Seconds" . 👉 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. Check SQL Server Plan Cache Pollution (III) in 45 Seconds Inside SQL Server Compilation & Recompilation | Part 24 Ever wondered why your CPU hits 100% despite low query volume? In this post, I'll tear apart the mechanics of Compilation Storms and show you how to detect "SOS_CACHESTORE" bottlenecks in under a minute. 🧠 TL;DR BOX ✔️ Compilation Cost: CPU cycles are wasted when SQL Server performs "Full Optimization" repeatedly. 💣 ✔️ Trivial Plans: The fast-track to execution that skips cost-base...

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 (I) . 👉 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. Check SQL Server Plan Cache Pollution (II) in 45 Seconds The "45 Seconds DBA Series" | Part 23 You fixed ad-hoc queries, but your server is still screaming? In this post, I’ll expose why even perfect parameterization can lead to "reuse toxicity" and massive CPU spikes. 🧠 TL;DR BOX ✔️ Parameterized Pollution: Cache pollution isn't just "too many plans"; it's also "the wrong plan reused everywhere." 💣 ✔️ Reuse Toxicity: A plan optimized for a single row is forced onto a million-row result set, killing p...

Before we dive into today's topic, if you missed my previous post you can take a look at SQL SERVER “If SQL Server Errors Were Honest” - Sunday SQL Humor 😅 . 👉 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. Check SQL Server Plan Cache Pollution (I) in 45 Seconds The "45 Seconds DBA Series" | Part 22 In this post, I’ll show you how "single-use" execution plans are silently hijacking your server's RAM and how to stop this memory waste in under a minute. 🧠 TL;DR BOX ✔️ Plan Cache Pollution occurs when non-parameterized queries create thousands of useless, single-use execution plans. 💣 ✔️ Memory Starvation: These plans steal space from the Buffer Pool, forcing data out of memory and increasing I/O. 📉 ...

Before we dive into today's topic, if you missed my previous post you can take a look at The Dangerous Truth About Scalar Functions in 45 Seconds, The "45 Seconds DBA Series" | Part 20 . 👉 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. Why Cursors Kill Performance (and When They Don’t) The "45 Seconds DBA Series" | Part 21 In this post, I’ll expose why T-SQL cursors are often the primary cause of CPU spikes and blocking chains. Master the set-based mindset to unlock massive scalability! 🧠 TL;DR BOX ✔️ RBAR (Row-By-Agonizing-Row): Cursors execute procedural logic, destroying the power of the set-based optimizer. 💣 ✔️ High Overhead: Context switching between the engine and the cursor memory destroys throughpu...

Before we dive into today's topic, if you missed my previous post you can take a look at SSMS 22.6.0 Is OUT! Review & Test! . 👉 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. The Dangerous Truth About Scalar Functions in 45 Seconds The "45 Seconds DBA Series" | Part 20 Scalar UDFs are the silent killers of SQL Server performance. In this post, I will reveal why they hide their true cost and how they turn a fast query into a row-by-row disaster. 🧠 TL;DR ✔️ Scalar UDFs force RBAR (Row-By-Agonizing-Row) execution, bypassing the set-based power of the optimizer. 💣 ✔️ Inhibits Parallelism: Traditional scalar functions force your entire query to run on a single thread. 🧵 ✔️ Hidden Costs: Execution plans ofte...

Before we dive into today's topic, if you missed my previous post you can take a look at The Hidden Cost of Implicit Conversions in 45 Seconds . 👉 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. Why NOLOCK Can Corrupt Your Logic in 45 Seconds The "45 Seconds DBA Series" | Part 19 In this post, I’ll show you how the (NOLOCK) hint can silently double-count or skip records entirely in your reports. Don't risk your data integrity for a false sense of speed! 🧠 TL;DR ✔️ NOLOCK allows dirty reads of uncommitted, potentially rolled-back data 💣 ✔️ Allocation Scans can cause rows to be skipped or read twice during page splits 🔄 ✔️ RCSI is the professional alternative for non-blocking read consistency 🚀...