Finding High-CPU Queries

Dennes Torres has a script to check CPU-intense queries:

Fortunately we can find queries with high CPU time using sys.dm_exec_query_stats DMV. This DMV, created in SQL Server 2008, keeps performance statistics for cached query plans, allowing us to find the queries and query plans that are most harming our system.

Glenn Berry’s fantastic set of diagnostic queries also includes a couple for finding CPU consumers.

Related Posts

When Adding Indexes Hurts Performance

Jeffry Schwartz takes us through an odd case: Recently, a customer requested that we tune a query that took 13 seconds to return 11 rows.  SQL Server 2017 suggested an index to improve performance, so we added it in a development environment.  The improvement made the query run 647 seconds, almost 50 TIMES longer than the original!  This naturally caused […]

Read More

Power Query and the Benefits of Immutability

Chris Webb explains why immutable expressions can be faster to run multiple times than mutable processes: Instead of taking the value #”Sorted Rows”[Column2]{0} and storing it in the variable Column2 then adding Column2 four times, I’m  adding the expression #”Sorted Rows”[Column2]{0} together four times. The query returns the same number as the previous query. However […]

Read More

Categories

February 2016
MTWTFSS
« Jan Mar »
1234567
891011121314
15161718192021
22232425262728
29