[Haskell-cafe] acid-state audit trail

Neil Davies semanticphilosopher at gmail.com
Fri Oct 19 12:53:49 CEST 2012

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> wrote:

> 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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