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From Alex Karasulu <aok...@bellsouth.net>
Subject Re: Summer of Code Application
Date Mon, 13 Jun 2005 23:59:40 GMT
Enrique Rodriguez wrote:

> Alex Karasulu wrote:
> > ...
>
>> 2). More backend partition types as noted above by Enrique.
>> BTW the Prevayler based in memory backend will save major disk IO 
>> down the line when used to replace the system backend partition.  All 
>> major subsystems that will be made more robust after subentries are 
>> implemented will most likely use the system partition to store 
>> persistent information.  Prevayler from my understanding puts an 
>> entire db into memory loading it on startup.   On shutdown changes 
>> are persisted or synch operations can be made intermittently ...
>
>
> Just want to correct a common misconception about Prevayler, since 
> I've done a couple impl's with it.  Prevayler transactions (more like 
> "operations," not to be confused with formal J2EE transactions) ARE 
> immediately persisted to disk.  It's the entire store, which yes is in 
> memory, that can be configured to periodically full-synch to disk, 
> generally 24hrs.  Upon crash or other restart scenario the 
> transactions can be replayed against the last full-synch, ensuring no 
> loss of data.


Thanks for the clarification Enrique.  I have never used Prevayler but 
have looked at it's documentation thanks to your references.  It sounds 
like a great candidate. 

Does it use HOWL for its transaction log?

Alex


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