Why is CouchDB not a good solution?
- Couch does not support queries for aggregation
- Couch does not support multiple map and reduce tasks
- except the re-reduce, which works on the output of the reducer, but is not intuitiv to the Map&Reduce schema
- Couch experts are rare
- Although combined keys are supported
- the disjunction or conjunction depends on the order and type of the keys
- ranges, eg, time, do not work if it is not a single key
- Creation of new views (new query type) consumes lots of time
- Comparable less documentation especially for the data analyses / aggregation
To sum up, there lots of problems one has to face on working with couch as a data aggregator. Which are mainly caused by the lack of experience.
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