On Wed, 17 Feb 2010, laurent laffont wrote:
Really great informations :
Scenario˙˙s
In different situations, there are different storage needs
1. You are writing a small demonstration program to show your customers,
and want to populate the system with some representative data. Add a class
instance variable to store the instances, and simply save the image.
2. You have a small system with a few hundred/thousand objects, and are
not dependent on external systems. A prevayler-like system like SandstoneDB
might be a perfect fit. Each object save means a disk access, so scaling
ends with disk speed. A few old versions of the data are kept around, so
backing up or reverting is easy. If you want a readable representation, SIXX
might help.
3. You have a legacy (relational) database, with extensive reporting
written for it. Use an ORM.
Relational databases are not legacy, they have features which "modern"
key-value stores don't (and won't). ORMs may ease the programmer's work,
but they tend to have bad runtime performance and can't use (all) the
features of todays RDBMSs.
Levente
4. You have a complex and large object model that has to support changing
the object model while developing. The solution is an OODB. Gemstone is the
large and proven commercial offering. It has a free version for smaller
databases (4GB data, 1 core, 1G ram), and has proven scalability to 500
machines. Magma is an open source OODB, seeing active development and
growing more and more advanced functionality.
Laurent Laffont
On Wed, Feb 17, 2010 at 3:07 PM, laurent laffont
<[email protected]>wrote:
No :) Thanks for the link !
Laurent Laffont
On Wed, Feb 17, 2010 at 2:23 PM, Stephan Eggermont <[email protected]>wrote:
Hello Laurent,
I assume you are aware of:
http://www.seaside.st/documentation/persistence
Stephan
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