Size op     Native       GDBM       NDBM       ODBM       SDBM    DB_File   CDB_File   Berkeley     SQLite         Pg      mysql        CSV
------ -- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
    20 rd  1428571.4   119047.6    84388.2    73800.7    91743.1    46403.7   512820.5    25031.3    17226.5     3287.3     1573.4     1003.0
    20 wr  1428571.4    80971.7    59171.6    50377.8    42553.2    45766.6   425531.9    24600.2    12586.5     1481.4      361.0     1079.7
   200 rd  2739726.0   142959.3   110132.2    93985.0   105652.4    57954.2   947867.3    32631.8    22634.7     7008.2     1574.5      203.4
   200 wr  2409638.6   151285.9   100200.4    86355.8    51533.1    75358.0   943396.2    41999.2    15764.2     2941.3      961.0      375.2
   600 rd  2597402.6   145384.1   118506.8   106345.3   122299.2    66430.5   823045.3    40952.8    30453.8    11594.7      646.6          -
   600 wr  2409638.6   167597.8   117947.7   101078.2    53922.9    74915.7   840336.1    46285.6    19183.4     6221.4      692.4          -