SQL Server 2022 Query Performance Tuning: Troubleshoot and Optimize Query Performance

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

G. FritcheySQL Server 2022 Query Performance Tuninghttps://doi.org/10.1007/978-1-4842-8891-7_18

18. Row-by-Row Processing from Cursors and Other Causes

Grant Fritchey¹  

(1)

Grafton, MA, USA

 

The best way to manipulate data within SQL Server is through the use of set-based operations. However, as humans, we tend to think about data in a more row-by-row way. It’s true that Oracle uses a construct called a cursor to facilitate rapid data access. It’s not the same in SQL Server. When accessing data using cursors within SQL Server, row by row can be one of the slowest ways to work with data. Jeff Moden has famously called this type of processing “ree-bar”, abbreviated ...