http://blogs.enterprisedb.com/2014/09/24/postgres-outperforms-mongodb-and-ushers-in-new-developer-reality/
EDB found that Postgres outperforms MongoDB in selecting, loading and inserting complex document data in key workloads involving 50 million records:
- Ingestion of high volumes of data was approximately 2.1 times faster in Postgres
- MongoDB consumed 33% more the disk space
- Data inserts took almost 3 times longer in MongoDB
- Data selection took more than 2.5 times longer in MongoDB than in Postgres
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