Re: PITR- timeline query

Can anyone answer please ?

--- Satya Prakash Tripathi <sptripathi78(at)yahoo(dot)com>
wrote:

> Hi ,
>
> I am experimenting with PITR aspect of postgres8.0,
> and I needed some answers on this subject.
>
> I have following questions :
>
> 1)
> At time t0, I created a base backup. (got a backup
> marker file named as:
> 0000000800000002000000A8.005E61B4.backup)
> (assume no previous base backups and recoveries...)
>
> On time t2 I did a recovery till time t1 (
> t0<t1<t2).
> Now I see history file named 00000009.history. And
> then onwards, the WAL filenames start with 00000009.
>
> Is 00000009 here the new timeline ? If so is it safe
> to deduce that from .history file that gets
> generated
> after recovery ?
>
> 2)
> Now say, I was happy with the above recovery and
> after
> a few days, at time t3 I decided to revover my db
> back
> in time t.
>
> What timeline should I specify in recovery.conf if:
> (or do I need to specify it in each case?)
>
> a) t1 < t < t2
> b) t2 < t < t3
>
> IMO, in case a) the timeline of base backup would
> be
> used, so I wouldn't need to specify timeline. While
> in
> case b) I need to specify this new
> timeline(recovery_target_timeline=00000009).
> Kindly confirm...
>
> trying to put the scenario pictorially:
>
> t0 t2
> | t1 |
> |-------| ------ |---------- timeline: 00000008
> |
> | timeline:
00000009
>
|----------------------|----
>
t3
>
>
>
> TIA,
> Satya
>
>
>
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