Re: [HACKERS] CURRENT OF cursor without OIDs

[Tom Lane]

Hiroshi Inoue <[EMAIL PROTECTED]> writes:
> GetXmaxRecent() ignores the backend tx_old because it had been
> committed when VACUUM started and may return the xid > the
> very old xid of tx_old.

Absolutely not; things would never work if that were true.
GetXmaxRecent() returns the oldest TID that was running *when any
current transaction started*, not just VACUUM's transaction.  Thus,
no transaction that could be considered live by the cursor-holding
transaction will be considered dead by VACUUM.

                        regards, tom lane

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