| From: | Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
|---|---|
| To: | "'Robert Haas *EXTERN*'" <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: UNDO and in-place update |
| Date: | 2016-11-23 09:38:31 |
| Message-ID: | A737B7A37273E048B164557ADEF4A58B5399B056@ntex2010i.host.magwien.gv.at |
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| Lists: | pgsql-hackers |
Robert Haas wrote:
> To implement this in PostgreSQL, I believe we would need support for
> UNDO.
> - Reading a page that has been recently modified gets significantly
> more expensive; it is necessary to read the associated UNDO entries
> and do a bunch of calculation that is significantly more complex than
> what is required today.
As others have said, that is the main drawback.
Also, and related to this, ROLLBACK would become an expensive operation.
Yours,
Laurenz Albe
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