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Performance using CTE vs temp tables


Performance using CTE vs temp tables

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npranj
npranj
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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
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SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)SSC Guru (118K reputation)

Group: General Forum Members
Points: 118377 Visits: 41480
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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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