| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Zeugswetter Andreas SB SD" <ZeugswetterA(at)spardat(dot)at> |
| Cc: | "Andreas Pflug" <pgadmin(at)pse-consulting(dot)de>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: PITR Functional Design v2 for 7.5 |
| Date: | 2004-03-11 06:57:39 |
| Message-ID: | 16806.1078988259@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Zeugswetter Andreas SB SD" <ZeugswetterA(at)spardat(dot)at> writes:
> What I think is possible is the following (continuous backup of WAL assumed):
> - disable VACUUM
> - issue CHECKPOINT "C1"
> - backup all files
> - reenable VACUUM
> - restore files
> - adapt pg_control (checkpoint "C1")
> - recover WAL until at least end of backup
I do not understand this fixation on "disable VACUUM". What are you
thinking that will buy you? AFAICS it would make no difference.
> I am not sure about clog, isn't clog logged in xlog ?
Right. For the purposes of PITR, clog behaves the same as regular
data files. You gotta back it up, but a filesystem copy will be
inconsistent until fixed by WAL replay.
regards, tom lane
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