[ZODB-Dev] Re: PGStorage

[Jim Fulton]

On Jan 24, 2008, at 3:12 AM, Thomas Lotze wrote:

> Jim Fulton wrote:
>
>> IMO, something that packed incrementally, with disk being freed  
>> along the
>> way, would be a big improvement. This isn't possible with  
>> FileStorage.
>
> Just an idea, without having followed FileStorage's history: Has  
> spreading
> the file storage across multiple files been considered?

Sure, but then retaining consistency across files would become a  
greater challenge.  It is certainly possible, that's what the Berkeley  
DB does.

That would be an entirely different storage implementation.


> Suppose
> FileStorage didn't put everything into one big file which has to be
> rewritten from scratch during packing. Since transactions are simply
> appended to that big file it should be possible to store each  
> transaction
> in its own small file. Incremental packing might then be possible by
> conflating the oldest n files into one, for some sufficiently small n.

Lots of things are possible in alternative storage implementations.   
That wouldn't be FileStorage.

Jim

--
Jim Fulton
Zope Corporation