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The supported databases are MongoDB, SQL-based databases compatible with SQLAlchemy, and HBase. however, Ceilometer developers recommend MongoDB due to its processing of concurrent read/writes. In addition, only the MongoDB backend has been thoroughly tested and deployed on a production scale. Production scale metering is estimated to have 386 writes per second and 33,360,480 events a day, which would require 239 Gb of volume for storing statistics per month.