Jason,
No, compat level is not a perf thing - it is a language functionality thing.
OF course, there might always be some extreme cases where we do see some
different execution plan, but that is definitely exception (if such at all
occurs...).
--
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://sqlblog.com/blogs/tibor_karaszi
"Jason Huang" wrote in message
> Hi,
>
> I'm wondering if I set the COMPATIBILITY_LEVEL of my SQL Server 2008 db to
> 100, will this improve the efficiency of that db?
> Thanks for help.
>
>
> Jason
>