Effects of a Database restoration.

Hi,

Does a database restoration perform any
update-statistics/defragmentation by default. We observed a marked
improvement in performance when we restored the a database from an high
end machine to a low machine.

Could someone shed some light on this.

Regards,
Thyagarajan Delli.Thyagu (tdelli@.gmail.com) writes:
> Does a database restoration perform any
> update-statistics/defragmentation by default.

As far as I know, no. Except, that if the MDF is very fragmented on the
source machine, and the target machine has space to accept it as
contiguous, you will see defragmentation on that level.

> We observed a marked improvement in performance when we restored the a
> database from an high end machine to a low machine.

Maybe the low-end machine has a single CPU? SQL Server sometimes goes
for parallel plans on multi-CPU machines that are not very efficient
at all.

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se

Books Online for SQL Server 2005 at
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