In this benchmark, a small database is generated, and each test is executed 20 times under the following conditions:

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CPU                  Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
RAM                  20536868 kB
Disk                 INTEL SSDSC2CW06
Linux distribution   Ubuntu 16.04 xenial
Python               3.5.2
Django               1.10.2
cachalot             1.4.2
sqlite               3.11.0
PostgreSQL           9.6.0
MySQL                5.7.15
Redis                3.0.6
memcached            1.4.25
psycopg2             2.6.2
mysqlclient          1.3.9
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