Another nice little tidbit of information about temporary tables in Denali: in all prior versions of SQL Server, through 2008R2, all temporary tables are created with positive object_id values. In Denali, local temporary tables are created with negative values (global temporary tables are still positive). I'm not sure of why the change... but if you are checking for existence of a temp table by: IF OBJECT_ID('tempdb..#table') > 0

then you better start changing it to IF OBJECT_ID('tempdb..#table') IS NOT NULL.