I finally got around to working on this, and ended up using the steps
outline here
<https://groups.google.com/forum/#!topic/h2-database/2EC0BxM9hsc>, which
worked great for my purposes.
Using "SET EXCLUSIVE 2" and "CHECKPOINT SYNC" turns out to be necessary;
without, I run into sporadic issues, e.g. tables not being found, missing
triggers, etc.
There are still some things I don't quite understand, such as:
1. Why exactly the absence of "SET EXCLUSIVE" and "CHECKPOINT SYNC"
occasionally results in failures? I think that I am being diligent about
terminating existing operations to the primary database before copying.
Perhaps there's no easy/obvious answer here.
2. What exactly is the different between the "*FS" class of databases
and the "mem" database?
3. Is it possible to backup and restore to a "mem" database similar to
"*FS" databases, e.g. with {input,output} streams? What part of the code
base is responsible for "mem" databases?
Thanks for the great tool :-)
Best,
Max
On Friday, June 16, 2017 at 10:43:42 AM UTC-4, Max Englander wrote:
>
> Interesting, thanks for the suggestion!
>
> Looking through the code now I see that MVStore uses FileStore which uses
> FilePath which maintains a publicly accessible registry of FilePath
> implementations, where I could register, for example, a CustomFilePathMem.
> Cool!
>
> Looking into the fs package, I see that ByteBuffer is used to pass data to
> and from FileBase, and that, in the case of FilePathMem, data in
> ByteBuffers makes ultimately makes its way into a byte array in
> FileMemData. I imagine, for my purposes, that I should be able to simply
> copy all of the underlying byte data stored in FileMemData after running my
> liquibase migrations and then, between each test, close/open H2 and restore
> the backed up byte data into CustomFileMemPath.
>
> Thanks, Noel!
>
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