[Zope] ZODB performance: reads to writes

[Toby Dickenson]

On Sat, 24 Jun 2000 12:43:05 -0400, "Evan Simpson" <evan@digicool.com>
wrote:

>> Will an app as described above still suffer from problems with high
>writes?


>There are two independent attacks on this problem underway:

>2. Implement the application-level conflict handling you read about, so that
>Folders and Catalogs can decide that two writes don't conflict after all,
>and merge them into a single update.

Yes, that will help


>1. Make Folders and Catalogs store meta-data about their contents in a data
>structure consisting of small persistent objects, like B-Tree nodes.  This
>reduces the scope of potential conflict (and the size of the update required
>by a write) to the size of one of these nodes.

As I understand it, a BTreeFolder alone (ie without application-level
conflict handling) will not help here.

Folders have to ensure that all their contained elements have a
different id. The hot-spot is the only way a Folder can achieve this.



Toby Dickenson
tdickenson@geminidataloggers.com