[ZODB-Dev] Fixing POSKeyErrors :-)

[Christian Theune]

Binger David schrieb:
> 
> On Feb 13, 2008, at 11:28 PM, Paul Winkler wrote:
> 
>    (Jim wrote)
>>> Catalogs and session data change much faster than content.  It makes 
>>> sense
>>> to pack these more frequently.  On large system, it provides the 
>>> ability to
>>> spread load over multiple servers, if necessary.
>>
>> Also, as I understand it, you can get more benefits from the "regular
>> content" ZODB cache if you're not constantly moving tons of catalog
>> data through it, so there's a performance win
> 
> It seems like all of these potential advantages are available through
> the use of multiple storages, but none of them really require 
> database-level
> support for cross-storage references.    On the other hand, it seems
> clear that cross-storage references make the system as a whole
> (software + people) less reliable.
> 
> Perhaps I misunderstand, but low-level cross-site references seem like 
> "secret"
> weakrefs.  Maybe we'd be better off if they were explicit, higher-level 
> objects,
> used and dereferenced intentionally where required.

Note: I have a proposal outstanding that would allow more flexible 
caching strategies that make database partitioning strategies 
independent from caching.

Christain

-- 
gocept gmbh & co. kg - forsterstrasse 29 - 06112 halle (saale) - germany
www.gocept.com - ct at gocept.com - phone +49 345 122 9889 7 -
fax +49 345 122 9889 1 - zope and plone consulting and development