From: | Richard Huxton <dev(at)archonet(dot)com> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Point in Time Recovery |
Date: | 2004-07-06 19:00:51 |
Message-ID: | 40EAF6E3.9090508@archonet.com |
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Lists: | pgsql-admin pgsql-hackers pgsql-patches |
Simon Riggs wrote:
> On Mon, 2004-07-05 at 22:46, Tom Lane wrote:
>
>>Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
>>
>>>Should we use a different datatype than time_t for the commit timestamp,
>>>one that offers more fine grained differentiation between checkpoints?
>>
>>Pretty much everybody supports gettimeofday() (time_t and separate
>>integer microseconds); you might as well use that. Note that the actual
>>resolution is not necessarily microseconds, and it'd still not be
>>certain that successive commits have distinct timestamps --- so maybe
>>this refinement would be pointless. You'll still have to design a user
>>interface that allows selection without the assumption of distinct
>>timestamps.
>
>
> Well, I agree, though without the desired-for UI now, I think some finer
> grained mechanism would be good. This means extending the xlog commit
> record by a couple of bytes...OK, lets live a little.
At the risk of irritating people, I'll repeat what I suggested a few
weeks ago...
Add a table: pg_pitr_checkpt (pitr_id SERIAL, pitr_ts timestamptz,
pitr_comment text)
Let the user insert rows in transactions as desired. Let them stop the
restore when a specific (pitr_ts,pitr_comment) gets inserted (or on
pitr_id if they record it).
IMHO time is seldom relevant, event boundaries are.
If you want to add special syntax for this, fine. If not, an INSERT
statement is a convenient way to do this anyway.
--
Richard Huxton
Archonet Ltd
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