Size op       perl     SQLite         Pg      mysql    MariaDB        CSV
------ -- ---------- ---------- ---------- ---------- ---------- ----------
    20 rd  6666666.7   227272.7     3916.2     7538.6     9267.8     4444.4
    20 wr  6666666.7   172413.8     2842.1     1759.3     1882.7    11560.7
   200 rd  8333333.3   414078.7    12738.9     8710.4    24330.9      901.9
   200 wr  9523809.5   310559.0    12190.7     7399.7    13898.5    13556.6
   600 rd 24000000.0   371977.7    14399.2    15106.9    24207.2      346.0
   600 wr 20689655.2   376884.4    14260.9    12633.4    23992.3    14080.5
  2000 rd 13986014.0   392310.7    45244.8    23147.1    23431.8      107.1
  2000 wr 51282051.3   405515.0    18964.5    16786.4    31738.5    14729.2
 20000 rd 25380710.7   374995.3    42310.4    22139.2    22889.8          -
 20000 wr 40899795.5   390930.4    33410.4    37265.1    32508.7          -