Database Reference
In-Depth Information
Figure 17-6.
Execution plan prior to data changes
■
please ensure that the setting for the graphical execution plan is
OFF
; otherwise, the output of
STATISTICS XML
won't display.
Note
While reexecuting the stored procedure, SQL Server automatically detects that the statistics on the index
have changed. This causes a recompilation of the
SELECT
statement within the procedure, with the optimizer
determining a better processing strategy, before executing the
SELECT
statement within the stored procedure, as
you can see in Figure
17-7
.
Figure 17-7.
Effect of statistics change on the execution plan
Figure
17-8
shows the corresponding Extended Events output (with the
auto_stats
event added).
