Re: [HACKERS] Re: BUG #4796: Recovery followed by backup creates unrecoverable WAL-file

Simon Riggs wrote:
> On Fri, 2009-05-15 at 17:39 +0300, Heikki Linnakangas wrote:
>
>>> We've asked for some additional docs. What would be the objection to
>>> that?
>> I'm certainly not opposed to improving docs.
>
> OK, so will you update the docs as requested?

Well, we already have this in the docs:

> Each time a new timeline is created, PostgreSQL creates a "timeline history" file that shows which timeline it branched off from and when. These history files are necessary to allow the system to pick the right WAL segment files when recovering from an archive that contains multiple timelines. Therefore, they are archived into the WAL archive area just like WAL segment files. The history files are just small text files, so it's cheap and appropriate to keep them around indefinitely (unlike the segment files which are large). You can, if you like, add comments to a history file to make your own notes about how and why this particular timeline came to be. Such comments will be especially valuable when you have a thicket of different timelines as a result of experimentation.

What exactly do you want to change? Patch, please.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com