Question

Is it possible to rename a temporary table?

create table #t (id integer);
execute tempdb.sys.sp_rename '#t', '#s';

An invalid parameter or option was specified for procedure 'sys.sp_rename'

The proposed solution by @Michel, inserting into another temp table and dropping the original, works but I guess how expensive it is.

Answer 1

Tempdb doesn’t have the sp_rename procedure. What you could do is to create a new temptable with the contents of your old one

Something like this

select * into #NewName from #OldName
drop table #OldName