[Haskell-cafe] acid-state audit trail
rwallace at thewallacepack.net
Fri Oct 19 17:38:37 CEST 2012
Ok, cool. Any idea if you can get a list of events, or can you just get the
On Oct 19, 2012 3:53 AM, "Neil Davies" <semanticphilosopher at gmail.com>
> The history is there until you "archive" (move a checkpoint out into a
> separate directory) it and then delete the archive yourself.
> the checkpointing just reduces the recovery time (i.e creates a fixed
> point in time), if you were to keep all the checkpoint/archives then you
> would have the complete history
> On 19 Oct 2012, at 06:18, Richard Wallace <rwallace at thewallacepack.net>
> > Hey all,
> > I've been looking at acid-state as a possible storage backend for an
> > application. It looks like it fits my needs pretty damn well, but one
> > thing that I'm curious about is if it is possible to get a list of
> > "update events". You can obviously query for the current state, but
> > it's not immediately apparent if you can see the history of your
> > values state. This is useful in some things, like providing audit
> > trails and debugging. As well as being able to re-create state in a
> > different form.
> > I was also curious if the createCheckpoint function eliminates the
> > state history or does it just create a snapshot, it's not apparent
> > from the docs.
> > Thanks,
> > Rich
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