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I just felt silly voting so many times.

I guess I work at a big company. Our big data team is dealing with HBase and Vertica, our game team is dealing with mysql, our web team migrates a redis into couchdb, my team deals with mysqldb, neo4j, cassandra and sqlite on a test server where no one wants to set something proper up. Memcached and the file system is working on most services it makes sense on.



Yep, similar here -- many teams, many use cases, many DBs in use:

* Postgres (including RDS), Oracle, and MariaDB all used as transactional stores on projects of varying vintage

* Vertica for aggregate reporting

* Hadoop/HBase in another data warehouse

* Mongo in several key-value stores

* Amazon DynamoDB under evaluation for likely adoption for a newer key-value store

* memcached ubiquitous

* SQLite for simple read-only stores within web services

* Cassandra and Redis under evaluation for task queue result stores

In a large, mature organization, I think this kind of heterogeneity is both inevitable and appropriate.




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