Hi Tullio,

When you use MemoryDB, it means that you will always loose on startup all 
installation.
Just because it was kept in Memory and nothing can be persisted for a restart.
Using Memory DB for development makes only in some situations sense, for 
example that you're not interested in persisting anything but testing something 
which needs high performance you couldn't have otherwise bound to a bad 
filesystem on a laptop (not comparable to a huge Oracle DB server).

Using a MemoryDB just means, every time you restart the complete system will 
install again, and again, and again.

As Matthew wrote, the {{magnolia.update.auto}} property defines  if the system 
automatically does the update or you need to push on the install screen the 
installation.

Mgnl-bootstraps:
The you need to place for EVERY change you've done in JCR a xml export file to 
persist it when repo (the DB) is deleted and/or the module is reinstalled.
But in you case this is on every startup. Usually a developer needs to do that 
before deleting the repository manually.

So I don't see any gain for you using the Memory DB instead of the derby 
database for development.
Derby stores all on your filesystem in a embedded DB.
If you want to reinstall, delete the repository. You can copy it too and switch 
back if wanted, so its a bit more flexible than MySql for development. Its just 
a folder with files in your file system.

Regards
Christian

On Dec 13, 2010, at 7:50 AM, Tullio Bettinazzi wrote:

> 
> 
> I didn't find any error during migration.
> The parameter magnolia.update.auto is set to false, previously it was true
> but the startup failed as I indicated at the beginning of this thread.
> I understand thata, running in memory I sholuld save something in
> mgnl-bootdtrap but I don't know what, could You help me ?
> Tks
> Tullio
> 
> -- 
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> 
> 
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