| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: MVCC catalog access |
| Date: | 2013-07-02 15:37:37 |
| Message-ID: | 51D2F3C1.2030002@vmware.com |
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| Lists: | pgsql-hackers |
On 02.07.2013 18:24, Andres Freund wrote:
> I've quickly verified that it indeed uses them. I wish I hadn't. Brrr. I
> can't even guess what that should do from the surrounding code/function
> names. Except that it looks broken under concurrency as long as
> SnapshotNow is used (because the query's snapshot won't be as new as
> SnapshotNow, even in read committed mode).
>
> Heikki, do you understand the code well enough to explain it without
> investing time?
No, sorry. I think it has something to do with updateable cursors, but I
don't understand the details.
- Heikki
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