Multiple rows with a single INSERT in SQLServer 2008

Posted by Todd on Stack Overflow See other posts from Stack Overflow or by Todd
Published on 2010-04-12T16:35:12Z Indexed on 2010/04/12 17:13 UTC
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sql

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ado

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c++

I am testing the speed of inserting multiple rows with a single INSERT statement.

For example: INSERT INTO [MyTable] VALUES (5, 'dog'), (6, 'cat'), (3, 'fish)

This is very fast until I pass 50 rows on a single statement, then the speed drops significantly.

Inserting 10000 rows with batches of 50 take 0.9 seconds. Inserting 10000 rows with batches of 51 take 5.7 seconds.

My question has two parts:

Why is there such a hard performance drop at 50?
Can I rely on this behavior and code my application to never send batches larger than 50?

My tests were done in c++ and ADO.

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