Re: Freeze avoidance of very large table.
| От | Simon Riggs |
|---|---|
| Тема | Re: Freeze avoidance of very large table. |
| Дата | |
| Msg-id | CANP8+jLWbhcYnEug1UtZSX91vYjLA4v_RR5S2aMBAYxr8UmevA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Freeze avoidance of very large table. (Simon Riggs <simon@2ndQuadrant.com>) |
| Ответы |
Re: Freeze avoidance of very large table.
Re: Freeze avoidance of very large table. |
| Список | pgsql-hackers |
On 6 July 2015 at 17:28, Simon Riggs <simon@2ndquadrant.com> wrote:
That way we will be able to easily check whether the rewrite has been conducted on all relations.
I think we need something for pg_upgrade to rewrite existing VMs. Otherwise a large read only database would suddenly require a massive revacuum after upgrade, which seems bad. That can wait for now until we all agree this patch is sound.
Since we need to rewrite the "vm" map, I think we should call the new map "vfm"
Since the maps are just bits there is no other way to tell that a map has been rewritten
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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