| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Transaction Snapshots and Hot Standby |
| Date: | 2008-09-15 09:40:15 |
| Message-ID: | 1221471615.3913.1238.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-hackers |
On Sat, 2008-09-13 at 10:48 +0100, Florian G. Pflug wrote:
> The main idea was to invert the meaning of the xid array in the snapshot
> struct - instead of storing all the xid's between xmin and xmax that are
> to be considering "in-progress", the array contained all the xid's >
> xmin that are to be considered "completed".
> The downside is that the size of the read-only snapshot is theoretically
> unbounded, which poses a bit of a problem if it's supposed to live
> inside shared memory...
Why do it inverted? That clearly has problems.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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