How Parallel Plans Start Up – Part 2 Paul White continues his deep dive into parallel plans, explaining iterative execution, invisible profilers, and how the query scan begins. Paul White ◆ April 8, 2021 0
How Parallel Plans Start Up – Part 1 Paul White takes a deep dive into the way parallel plans start up, including the role of the parent task (coordinator) in plan execution. Paul White ◆ March 30, 2021 2
Understanding Execution Plan Operator Timings How SQL Server actual execution plan operator timings work, and why parallel row mode plan timings can be misleading, by Paul White. Paul White ◆ March 8, 2021 3
A use case for sp_prepare / sp_prepexec Aaron Bertrand explains a scenario where sp_prepare came in handy trying to validate a plan guide's impact. Aaron Bertrand ◆ January 11, 2021 0
When Do SQL Server Sorts Rewind? Paul White explains when a SQL Server sort operator inside a loop rewinds (replays) cached results to avoid re-executing plan operators. Paul White ◆ October 7, 2020 0
The Eager Index Spool and The Optimizer Paul White looks at the Eager Index Spool execution plan operator, and the optimizer rules capable of adding it into plans. Paul White ◆ November 22, 2019 0
Batch Mode Normalization and Performance Paul White takes a deep-dive look at the internals of batch mode data normalization and how it can affect execution plans and performance. Paul White ◆ September 5, 2019 1
Batch Mode Bitmaps in SQL Server Paul White takes a deep dive into SQL Server batch mode bitmaps revealing undocumented details that can greatly impact performance. Paul White ◆ August 23, 2019 3
Some ANY Aggregate Transformations are Broken Paul White explores two cases where the introduction of the internal ANY aggregate by the optimizer may cause wrong results. Paul White ◆ July 1, 2019 8
Minimal Logging with INSERT…SELECT and Fast Load Context Paul White explains minimal logging for inserts into b-tree indexes using Fast Load Context, and why it might not always work as expected. Paul White ◆ May 29, 2019 0
Examining the Performance Impact of an Adhoc Workload Erin Stellato discusses the performance impact of a predominately adhoc workload in SQL Server. Erin Stellato ◆ May 22, 2019 3
