[ZODB-Dev] packing ZODB

[Shane Hathaway]

On 03/31/2011 04:46 AM, Adam GROSZER wrote:
> After investigating FileStorage a bit, I found that GC runs on objects,
> but pack later by transactions. That means that if there's a bigger-ish
> transaction, we can't get rid of it until all of it's objects are GCed
> (or superseeded by newer states).

No, but we can remove old object states from the big transaction and 
mark it as partially destroyed (that's what the "packed" flag is for) so 
that the transaction is no longer eligible for undo.  Both FileStorage 
and RelStorage do that.  Not much space is wasted.

Shane