[ZODB-Dev] Analyzing the committed data during one transaction

[Jim Fulton]

On Nov 15, 2008, at 10:03 AM, Andreas Jung wrote:

> Hi there,
>
> is there a way to analyze the data committed during one transaction?
> The current usecase is Plone. A simple change to a document causes a  
> large transaction (between 30k and 100k even for a one-char change).  
> I am interested to know how many of this data belongs  to the  
> portal_catalog/index and how many are actually changes to the  
> content object itself (or subobjects).


You can use a storage iterator to iterate over the data records in the  
transaction.  You can analyse these records to see things like, their  
number, size and type.

To look at a single transaction, pass the transaction id as the start  
transaction for the iterator. Then call next on the iterator to get an  
iterator for that transaction.

Jim

--
Jim Fulton
Zope Corporation