So what is the largest ZODB (in terms of persistent objects contained in it)?  Does anyone have any metrics?





From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of matt wilbert
Sent: Sunday, January 22, 2006 11:21 AM
To: Jeff Rush
Subject: Re: [Zope3-Users] Re: Zope 3 Capacities


It probably won't meet their needs either, but the latest version of DirectoryStorage is supposed to be compatible with Zope3.
It might mitigate the startup time and index memory consumption issues somewhat, especially if they can use reiserfs.


On 1/22/06, Jeff Rush < [EMAIL PROTECTED]> wrote:

David Johnson wrote:
> In general we're looking at using an RDBMS, but we're trying to
> get a better feeling of when we can use the ZODB and when we
> should stick to the RDBMS.
> We have various datasets:
>    1. Transactions: 10-100 billion objects
>    2. Users: 10-100 million objects
>    3. Contacts: 100,000 objects
>    4. Customers: 100-1000 objects

I see other good replies but one factor you must keep in mind for ZODB is
that it keeps the index of all objects in memory.  With 100 billion
transaction objects, you're going to need a LOT of RAM and have a large

I've always wondered why ZODB didn't offer an option of storing the object
index in a BTREE, but I guess its the performance issue of potential
additional disk accesses.


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