Click here to monitor SSC
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Performance using CTE vs temp tables


Performance using CTE vs temp tables

Author
Message
npranj
npranj
SSC Journeyman
SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)SSC Journeyman (77 reputation)

Group: General Forum Members
Points: 77 Visits: 320
Hi All,

I have replaced 3 temp tables in my batch with multiple CTEs.
I see remarkable 50% benefit in REads and Writes have reduced to 0, however, I wanted to know on the CPU.
Is CTE CPU Intensive? I am getting varying CPU results.

Also, I see from other questions that CTEs hit performance when table size is v great. Is that so?
Jeff Moden
Jeff Moden
SSC Guru
SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)SSC Guru (51K reputation)

Group: General Forum Members
Points: 51629 Visits: 40307
nidhis (12/13/2012)
Hi All,

I have replaced 3 temp tables in my batch with multiple CTEs.
I see remarkable 50% benefit in REads and Writes have reduced to 0, however, I wanted to know on the CPU.
Is CTE CPU Intensive? I am getting varying CPU results.

Also, I see from other questions that CTEs hit performance when table size is v great. Is that so?


"It Depends" on what the Temp Tables are being used for and how they are being used. Just like views and derived tables, CTEs can be quite good at performance and quite bad.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search