Re: Deriving Recovery Snapshots

On Thu, 2008-10-16 at 18:52 +0300, Heikki Linnakangas wrote:
>
> Also, I can't help thinking that this would be a lot simpler if we just 
> treated all subtransactions the same as top-level transactions. The only 
> problem with that is that there can be a lot of subtransactions, which 
> means that we'd need a large UnobservedXids array to handle the worst 
> case, but maybe it would still be acceptable?

I remember cases on this list where long transactions did run out of
subtransaction ids. To accommodate something approacing that we need an
array for storing (max_connections * 4G ) UnobservedXids instead of just
max_connections.

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Hannu