Big Performance Tuning Mistakes

Erik Darling enumerates common performance tuning mistakes:

Coming in at number five and looking alive! Did you know that query plans can be different on busy servers? I bet not! And aside from that, your performance problem might not even be the query itself, it may be blocking, or a poison wait. This stuff may not show up in Dev, unless yous spend a lot of time and money engineering load tests.

This is what safety groups call “Situational Awareness”, and this is the kind of stuff that you really want a monitoring tool in place for. Sure, that query ran slowly, but if that’s all you know, and you can’t reproduce it, then you need to start digging deeper.

There are a number of tips here, and that number is five.

Related Posts

Tuning Azure SQL Database

Tim Radney walks us through some of the tools we have available to tune Azure SQL Databases: Many instance-level items that you have been used to configuring on full installations are off limits. Some of these items include:– Setting min and max server memory– Enabling optimize for ad hoc workloads– Changing cost threshold for parallelism– […]

Read More

Performance Testing Simple Scalar UDF Functions

Wayne Sheffield tries out a simple scalar UDF in SQL Server 2019 to see how it performs: I recently published a post detailing the new Scalar UDF Inlining feature in SQL 2019 here. That post introduced the new feature in a way that I used to compare performance to the other function types, continuing the […]

Read More

Categories

August 2017
MTWTFSS
« Jul Sep »
 123456
78910111213
14151617181920
21222324252627
28293031