On 2/23/17 8:47 PM, Michael Paquier wrote:
Anything else than measured in bytes either requires a lookup at the
file timestamp, which is not reliable with noatime or a lookup at WAL
itself to decide when is the commit timestamp that matches the oldest
point in time of the backup policy.

An indication that it'd be nice to have a better way to store this information as part of a base backup, or the archived WAL files.

That could be made performance
wise with an archive command. With pg_receivexlog you could make use
of the end-segment command to scan the completely written segment for
this data before moving on to the next one. At least it gives an
argument for having such a command. David Steele mentioned that he
could make use of such a thing.

BTW, I'm not opposed to an end-segment command; I'm just saying I don't think having it would really help users very much.
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532)

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