Laurence Rowe Slides An Introduction To The Zodb

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The Zope Object Database lies underneath every Plone site. This talk gives an introduction to how it works and offers some tips for debugging at the ZODB level

Negócios Tecnologia

An introduction to the
ZODB
Laurence Rowe, Plone Conference 2007, Naples.
laurence@lrowe.co.uk

In comparison to...

• Relational databases
• Hierarchical databases (LDAP, ﬁlesystems)
• Object-Relational Mappers (ORMs)

Transactions

• Concurrency Control
• Atomicity
• Conﬂict Errors

Scalability

• The Global Interpreter Lock
• ZEO
• Partitioning

ZEO
Zope

Storage 1
Zope

Pound
Apache ZEO
(load balancer)
Zope
Storage 2

Zope

Storage types

• FileStorage
• DirectoryStorage
• PGStorage

Other features

• Savepoints
• Versions (deprecated)
• Undo
• BLOBs
• Packing

Best Practice

• Don’t read on write
• Keep your code on the ﬁlesystem
• BTrees
• Simple content types

Documentation

• http://wiki.zope.org/ZODB/Documentation

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