Thank you for taking the time to respond. Much appreciated.
This is the callback function used for the test:
```
static uint64_t _phcount = 0;
static int _cdecl ProgressHandler_(void* pArgument) {
_phcount++;
return 0;
}```
When the test is over, my application just logs the value of that counter to a log file. The callback is always the same, it is just called much more often for database B.