Understanding Probe Residuals

Daniel Janik explains what a probe residual is in an execution plan:

A probe residual is important because they can indicate key performance problems that might not otherwise be brought to your attention.

What is a probe residual?

Simply put, a probe residual is an extra operation that must be performed to compete the matching process. Extra being left over things to do.

Click through for an example brought about by implicit conversion.

Related Posts

Automatic Tuning In SQL Server 2017

Arun Sirpal shows off one of the more interesting features in SQL Server 2017: Before we begin any further let’s do a little recap. Automatic tuning in SQL Server 2017 notifies you whenever a potential performance issue is detected, and lets you apply corrective actions, or lets the Database Engine automatically fix performance problems, this […]

Read More

Units Of Measure In The ShowPlan Schema

Grant Fritchey shows off the ShowPlan Schema: Because the showplan schema contains notes throughout stating what the units of measure are, what each of the values means. For instance, I can explain why SerialDesiredMemory, DesiredMemory, RequestedMemory are identical: …Provide memory grant estimate as well as actual runtime memory grant information. Serial required/desired memory attributes are […]

Read More

Categories

April 2017
MTWTFSS
« Mar May »
 12
3456789
10111213141516
17181920212223
24252627282930