Test why query cost percentages are estimates by comparing two statements with STATISTICS IO, TIME, and query DMV counters.
Memory Grant Feedback Events: Capture Them in T-SQL
Memory grant feedback events list every query whose memory grant keeps changing, and the moment SQL Server gives up on it. This post creates the Extended Events session in T-SQL, watches it live in SSMS and reads it with one query that names the procedure.
Comparing a Good and a Bad Plan for One Query in Query Store
Compare a good and a bad plan in Query Store using runtime history, SSMS Compare Showplan, estimates, joins, grants, and parallelism.
SQL SERVER – MemoryGrantInfo Property Explanation
I have been writing about the Memory Grant Feedback feature. Today we will discuss various properties of MemoryGrantInfo in this blog post.
MemoryGrantInfo – What are Different Status of IsMemoryGrantFeedbackAdjusted? – Interview Question of the Week #253
Question: What are Different Status of IsMemoryGrantFeedbackAdjusted (MemoryGrantInfo Property)? Today we will see a consolidated answer to this question.
Stop Memory Grant Feedback: Database Setting and Query Hint
To stop memory grant feedback, use the hint or the setting that matches the mode of the plan. A tested demo shows that a row mode hint keeps a grant at 13,256 KB, while a batch mode hint changes nothing for a row mode sort. The post also corrects the setting names and shows the persistence switch.
Memory Grant Feedback Loop: When SQL Server Stops Adjusting
The memory grant feedback loop adjusts a grant after every run, and a query whose needs swing can send it back and forth. In a tested demo SQL Server stops adjusting on run 33 and falls back to its first grant. The post also shows what SQL Server 2025 does by default.