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Evaluating MongoDB vs. Postgres for a Particular Use-Case (ansible.com)
1 points by mig_ 3954 days ago
1 comments
oneweekwonder 3954 days ago
> Side note. Many other databases (i.e Riak, CouchDB, Cassandra) were looked at for this in-depth comparison.

Out of interest: What was wrong with CouchDB for your use case?

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mig_ 3954 days ago
Before the deeper evaluation we simply made a table of pros and cons of all the different databases. Below are what we considered the pros and cons of CouchDB for our use case.

Pros:

  * Projection feature
     address “weird” Ansible data format requirements.
     allow for a more compact and logical structure to be presented to the api.
  * Built in support for compaction
  * Built-in versioning
Cons:

  * couchdb versioning may not align with our notion of versioning
  * Requires a lot of space
  * Views instead of arbitrary queries
  * Performance not so predictable. (see how reads trigger version logic) (Colleague has had experience with this problem)
Edit: I found some other notes ...

    CouchDB appears to be a strong candidate. I am worried about the space requirements/consumptions. CouchDB uses views of data rather than queries.
Database comparison by feature matrix: http://i.imgur.com/6bdIvwE.png
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