sql-server-2019-new-features-batch-mode-on-rowstore 
SQL Shack
MAY 27, 2020
In this article, we will explain batch mode on rowstore feature, which was announced with SQL Server 2019. The main benefit of this feature is that it improves the performance of analytical queries, and it also reduces the CPU utilization of these types of queries.
SQL Performance
MARCH 8, 2021
SQL Server 2014 SP2 and later produce runtime (“actual”) execution plans that can include elapsed time and CPU usage for each execution plan operator (see KB3170113 and this blog post by Pedro Lopes). There are important differences between row mode and batch mode execution, as well as tricky issues with row mode parallelism.
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