> So I think what will work then is pg_copy (hot backup) would:
> 1) Issue an ALTER SYSTEM BEGIN BACKUP command which turns on
> atomic write,
> checkpoints the database and disables further checkpoints (so
> wal files
> won't be reused) until the backup is complete.
> 2) Change ALTER SYSTEM BACKUP DATABASE TO <directory> read
> the database
> directory to find which files it should backup rather than
> pg_class and for
> each file just use system(cp...) to copy it to the backup directory.
Did you consider saving backup on the client host (ie from where
pg_copy started)?
> 3) ALTER SYSTEM FINISH BACKUP does at it does now and backs
> up the pg_xlog
> directory and renables database checkpointing.
Well, wouldn't be single command ALTER SYSTEM BACKUP enough?
What's the point to have 3 commands?
(If all of this is already discussed then sorry - I'm not going
to start new discussion).
Vadim
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