It should not be, that the number of processes increase, under normal circumstances. But, indeed, if the command produces a lot of output, I can imagine, that the current implementation of SysProcess might have such problems.

So, I would recommend you to test it, by calling your own bash script, which is in fact doing the same as you do now, but discards the output.

E.g. (untested):

 

command0 : STRING := 'mysqlite3 ';

~~~

#!/bin/bash

exec "sqlite3" "$@" &> /dev/zero