Sergey wrote:
Would you tell me, please.Zope in operating time holds documents, methods, products (all that is in ZODB) in memory or reads out in memory as required. At use Gadfly from Zope all tables Gadfly are loaded into memory. What quantity of operative memory is necessary for use Zope, Gadfly?
Zope uses an rather robust Object database for the storage of DTML Documents, DTML Methods, ZSQL Methods, etc.. These objects are loaded into real memory when they are needed by the application. They remain in a memory cache for some amount of time until they are retired back to disk. There are configuration parameters in Zope for controlling how large the memory cache is and how aggressively the Z Object Database retires objects out of real memory. Gadfly, on the other hand, is an external product developed by Aaron Watters. It has been included in Zope because it is simple to install and provides a nice out-of-the-box relational database for people to use when first tinkering with Zope. AFAIK, the current incarnation of Gadfly uses real memory for all of its data storage. This _may_ make it unpalatable for use with large databases. (Note -- if the real memory ramifications of suing Gadfly are acceptable, you'll have a pretty fast database...). Finally, the memory requirements of Gadfly are additive with the memory requirements of Zope. As a result, it's easy to incorrectly assume that Zope itself is consuming large amounts of real memory when, in reality, it might be the Gadfly database. I have heard a rumor that a forthcoming version of Gadfly will be able to use disk files for storage. Hope this helps, --Rob P.S. - It's much easier to reply to non-HTML formatted email messages