[Zope] Zope leaking memory?

[Alec Mitchell]

On Sunday 12 September 2004 10:25 am, Chris McDonough wrote:
> get_transaction().commit(1) commits a "subtransaction".  This is used
> by, for example the Catalog, when doing batch reindexing.  You might
> want to grep for it in the ZCatalog product.  There is probably some
> surrounding hair to try to reduce memory consumption.
>
> Note that explicit transaction control is quite dangerous in Zope if
> used in the normal course of operations invoked by TTW users (for
> reasons too obscure to go into here: see recent posts to ZODB-dev).
> Using it in a script is typically fine though.

Is this the case even for subtransaction commits?  I have a particular piece 
of code that adds a new piece of content to a CMF Site programmatically as 
the result of a TTW action.  During the course of adding the content setId() 
is called on the object, which fails consistently unless a subtransaction is 
committed prior to the call (I believe the issue was that the created object 
wasn't yet stored in the ZODB, so calling setId (which causes a copy) 
failed).  Is this a risky practice?  If so, what's the alternative?  Thanks.

Alec Mitchell