Cursors: The Hidden Performance Problem

Michael Swart notes that cursor performance can be hidden from monitoring tools:

The OPEN statement is missing from sys.dm_exec_query_stats. I want to demonstrate that.

There are a few workarounds, and Michael even provides us a handy table, so read the whole thing.

Related Posts

Testing Inline Scalar UDF Performance

Erik Darling whips up a performance test covering scalar UDF changes in SQL Server 2019: This is a slightly different take on yesterday’s post, which is also a common problem I see in queries today. Someone wrote a function to figure out if a user is trusted, or has the right permissions, and sticks it […]

Read More

Making Non-SARGable Queries SARGable with an Index

Denis Gobo violates Betteridge’s Law of Headlines: This question came up the other day from a co-worker, he said he couldn’t change a query but was there a way of making the same query produce a better plan by doing something else perhaps (magic?) He said his query had a WHERE clause that looked like […]

Read More

Categories

January 2016
MTWTFSS
« Dec Feb »
 123
45678910
11121314151617
18192021222324
25262728293031