Pointers about what ? If you mean about "And your ZODB grows everytime you want to flush the cache..." : Andrew is just saying that changing a persistent attribute of an object will led to storing a new version of the object in the ZODB. If you mean about "why I was asking how to clear _v_ attributes" : I am using CMF 1.5.0 and SpeedPack 0.3, which monkey patches 2 CMF classes to speed up skinned objects lookup by caching the result of previous lookups in a new _v_ attribute on "CMF Site" objects. The performance increase is huge (if you have lots of skins defined, and lots of folders for each skin to be traversed). However, the situations that SpeePack "catches" to decide to clear the _v_ attribute data are not enough for my needs. I need a way to make sure that data is flushed in all connections. Hope this answer your question. Pascal -----Message d'origine----- De : zope-bounces@zope.org [mailto:zope-bounces@zope.org]De la part de Marco Bizzarri Envoyé : mercredi 19 janvier 2005 14:27 À : Andrew Milton Cc : zope@zope.org Objet : Re: [Zope] Clearing _v_ attributes Andrew Milton wrote:

+-------[ Toby Dickenson ]---------------------- | On Wednesday 19 January 2005 11:51, Andrew Milton wrote: | > +-------[ Pascal Peregrina ]---------------------- | > | If I do a clearCaches() method that clears _v_ attributes on the object, | how | > | can I make sure it will clear these attributes in all the Zope connections | > | that may have a cached copy of the object ? | > | > Basically you can't. | | There is one very obvious way.... change a non-_v_ attribute of the object and | commit it. Every other connection with an instance of that object in memory | will lose the _v_ attribute at its next transaction boundary.

And your ZODB grows everytime you want to flush the cache...

Could you please further detail the reason of the above (or provide pointers on this?) Regards Marco _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************