--On 22. Juni 2008 08:54:14 -0700 tsmiller <tsmiller@[...].com>  
wrote:


> 
>  I have two questions.
>  		1)  When I already have a storeNumber and I save a record to
> 
>               			db.dbRoot['books'][storeNumber][bookNumber] = record
> 
>  		 I have to set the _p_changed flag on the 'books' IOBTREE structure to
>  get the book to save.

I don't see why you need to set _p_changed here. The change should be 
noticed automatically.



> 
>  		Which means that it saves the ENTIRE 'books' IOBTREE' structure every
>  time a save a single book.  (at least it looks like it is doing this).

Such a change will write only the data of corresponding bucket back to the 
ZODB but not the complete object. That's why we are having BTrees.

>  When I edit a book and save it the database grows by more than 64k.  And
>  it looks like it will get worse and worse as more books are added.
> 
>  		Am I looking at this correctly.  Or am I doing something really
>  ignorant?

Your code using IOBTrees looks fine (except the unnecessary usage of 
_p_changed). Your observations or conclusions appear weird to me.

-aj