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Some useful talking points for discussing CouchDB.

  • CouchDB is not a relational database management system (RDBMS). CouchDB != SQL
  • Updating documents creates new documents. There are no partial updates or stored diffs.
  • Views are crucial to CouchDB. Similar in nature to indexes in a traditional RDBMS but lazily evaluated following a MapReduce paradigm. Views let you sort and filter data.

  • Reduce is tricky, yet powerful.
  • Complex key collation is important, yet can also be tricky.
  • Replication can create conflicts. This is unavoidable. System design should explicitly account for possible conflicts as they will happen.

  • The internal revisioning system is only for conflict detection and optimistic locking (Multi-Version Concurrency Control MVCC).

  • The internal revisioning system is not usable as a revision control system.

TalkingPoints (last edited 2009-09-20 21:44:42 by localhost)