Hello,
On Tue, 2017-12-26 at 18:58 -0300, Alvaro Herrera wrote:Hello,
> David Steele wrote:
>
> > pgBackRest will validate all page checksums (including indexes,
> > etc.) in the
> > cluster during backup. Full backups check everything,
> > incr/differential
> > backups check only the files that have changed.
>
> If a table or index file is of zero length when backed up, as in the
> described case, nothing will be checked, right? I mean, there is
> nothing externally indicating that the file ought to be of a
> different
> size. Am I wrong? So Edson's situation here would not raise any red
> flags.
>
Could the following occur:-
1) Your app. issues a BEGIN followed by an INSERT.
2) Postgres decides to open a new file in order to store the new row.
3) Your app. then does a ROLLBACK.
Wouldn't that leave you with a zero length file on disk?
There's no reason for Postgres to delete the file just because a
rollback was issued. All it has to do is clear the buffer in memory.
My 2 cents.
Rob
