Re: XID wraparound and busy databases

Robert Treat <xzilla@users.sourceforge.net> writes:
> I'm a little confused, wouldnt the transaction that waits 30 minutes before 
> modifying data need to get an XID that jives with the system when it's 
> transaction started, not when it began manipulating data?

Why?

> Would it really be safe to take a new snapshot at that time,

You wouldn't take a new snapshot.  The thought that occurs to me is that
there's no reason that a transaction has to have an XID for itself
before it takes a snapshot.  We always special-case our own XID anyway.
        regards, tom lane