> I'm confused. I thought that read-only read-committed transactions did not consume transaction ids.
> By  nature they don't need the protection of the transactional system. They don't make changes so
> there's no need to roll back. Nor is there any need to prevent others from reading their uncommitted
> changes. They don't offer consistent reads, so they don't need to prevent garbage collection. Why
> do they need unique transaction identifiers?