Horton

Re: All-visible pages with valid prune xid are confusing

Heikki Linnakangas <hlinnaka@iki.fi>

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From: Heikki Linnakangas <hlinnaka@iki.fi>
To: Melanie Plageman <melanieplageman@gmail.com>, Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@lists.postgresql.org
Date: 2025-12-02T19:39:42Z
Lists: pgsql-hackers 
On 02/12/2025 21:13, Melanie Plageman wrote:
> In terms of finding some XID to set it to, could we do what updates
> and deletes do and use the XLogRecord->xl_xid?

A prune record can have XLogRecord->xl_xid == InvalidTransactionId, if 
the transaction hasn't been assigned a transaction ID yet. I think 
ReadNextTransactionId() - 1 would work. (Using TransactionIdRetreat 
rather than plain - 1, of course)

- Heikki