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10 Dec 08

plope - Wherefore CouchDB for ZODB Users

"All in all, CouchDB is a neat piece of software. If I ever have to build an application that needs to store data that needs to be accessible from programs written in langauges other than Python across HTTP and I don't need to use a relational database, it seems like a great solution."

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python zodb couchdb database comparison strengths overview

I didn't understand why
folks were excited about CouchDB given that a good number of its
features (append-only storage and "schemaless design" in particular)
have been present in ZODB for a
little under ten years now. Even more in particular, I was really
baffled as to why Python developers were excited about such a system
given the availability of ZODB.
I think I understand a bit better now. ZODB and CouchDB are quite
similar in a lot of respects, but CouchDB beats ZODB on a narrow set
of goals that seem to be becoming more important
10 more annotations...
- the documented way to
  talk to CouchDB is over HTTP, and because you send it JSON primitives
  containing data structures, it can be used from just about any program
  written in just about any language. And given that most folks are not
  accustomed to being able to access any database without dark-magic C
  bindings that speak strange connection-oriented TCP protocols (or the
  equivalent embedded usually-crashy C bindings and awkward APIs), this
  is probably a novelty for many users.
- CouchDB has a built-in
  indexing and querying facility, in the form of
  Views.
  This is something that ZODB does not share. Instead, ZODB relies on
  applications that are built on top of it to provide indexing
  capabilities. Moreover, creating indexes in applications that use
  ZODB is historically a static kind of thing that the application
  developer does "up front", or at least as a "software release" sort of
  thing. In CouchDB, creating an index is not really an exceptional
  sort of event. You tell the server, over HTTP, to create the index by
  PUT-ing a view. The first time any view is queried, CouchDB does the
  indexing. The following times the view is queried, it uses the index
  you've created via the view to return the results faster. No
  application that I know of written on top of ZODB allows you to do
  such a thing so casually.
- All in all, CouchDB is a neat piece of software. If I ever have to
  build an application that needs to store data that needs to be
  accessible from programs written in langauges other than Python across
  HTTP and I don't need to use a relational database, it seems like a
  great solution.
- ZODB is probably still a better choice if your application is 100%
  Python and you want arbitrary application database write logic to be
  bounded within a single transaction.
- if you need to store large amounts of
  data (like arbitrary numbers of multimegabyte or multigigabyte files),
  ZODB is also probably a better choice, as it has blobs built in, and
  the blobs don't need to be base64 encoded in memory as "attachments"
- if you need to
  store data structures that cannot be represented as JSON (like complex
  object instances), ZODB really can't be beat.
- CouchDB no longer requires encoding
  binary data in base64. Attachments for documents (that work just like email
  attachments) have their own REST API since this summer where you can
  send the raw binary data to create and retrieve documents. So storing loads
  of data is no longer a bad idea.
- You can think of a ZODB database
  as a place to hang a graph of arbitrary Python objects that becomes
  persistent. It's sort of an "uber-pickle"
- You can use packages like
  repoze.catalog to do indexing
  and querying of object data that is inserted into the graph. You can
  use packages like
  repoze.folder to hold
  large collections of objects.
- The "Zope" in ZODB is a
  "brand-only" name; it does not require Zope; it can be used in any
  Python application.

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Olifante *'s Library tagged strengths → View Popular

plope - Wherefore CouchDB for ZODB Users

You Used JavaScript to Write WHAT?

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