On 04/22/2015 11:58 PM, Robert Haas wrote:
On Wed, Apr 22, 2015 at 3:34 PM, Heikki Linnakangas <hlinn...@iki.fi> wrote:
On 04/22/2015 10:21 PM, Robert Haas wrote:
On Wed, Apr 22, 2015 at 3:01 PM, Heikki Linnakangas <hlinn...@iki.fi>
wrote:
For example, imagine that perform point-in-time recovery to WAL position
0/1237E568, on timeline 1. That falls within segment
000000010000000000000012. Then we end recovery, and switch to timeline 2.
After the switch, and some more WAL-logged actions, we'll have these
files
in pg_xlog:
000000010000000000000011
000000010000000000000012
000000020000000000000012
000000020000000000000013
000000020000000000000014
Is the 000000010000000000000012 file a "partial" segment of the sort
you're proposing to no longer achive?
If you did pure archive recovery, with no streaming replication involved,
then no. If it was created by streaming replication, and the replication had
not filled the whole segment yet, then yes, it would be a partial segment.
Why the difference?
Because we don't archive partial segments, except for the last one at a
timeline switch, and there was no timeline switch to timeline 1 within
that segment.
It doesn't really matter, though. The behaviour at the switch from
timeline 1 to 2 works the same, whether the 000000010000000000000012
segment is complete or not.
- Heikki
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