Forum OpenACS Q&A: Response to "vacuum analyse" messing up the row ordering?

Surely without an order by clause, nothing about the order of rows
returned by an SQL select can be guaranteed or assumed, by definition.
What you get back is a *set* of tuples.  So I'd say it's not so much a
matter of 'vacuum analyze' breaking anything, more of your code making
an assumption that it simply ought not to make in the SQL world?