Re: Write ahead logging

Rod Taylor wrote:
> What were you using to measure the latency.  Don't suppose you could
> send it over.  The admins locally don't like what I used to do the test
> with -- they don't want to turn off write-caching for other reasons.

I am doing an insert of few bytes, so that the amount of data does not
significantly affect the measured time. And for measuring time without
cache, I temporarily switched it off.

That was the code used (nothing unusual):

#include "timeval.h"

main()
{
     Timeval start,end;
EXEC SQL WHENEVER sqlerror sqlprint;
EXEC SQL WHENEVER not found sqlprint;

EXEC SQL CONNECT TO user@localhost;
     start=Timeval::Time();
EXEC SQL BEGIN;
EXEC SQL INSERT INTO test values ('qwertz');
EXEC SQL COMMIT;
     end=Timeval::Time();
     end-=start;
     printf("time: %d.%06d\n",end.tv_sec,end.tv_usec);
}


- Matthias Meixner

--
Matthias Meixner                       meixner@informatik.tu-darmstadt.de
Technische Universität Darmstadt
Datenbanken und Verteilte Systeme              Telefon (+49) 6151 16 6232
Wilhelminenstraße 7, D-64283 Darmstadt, Germany    Fax (+49) 6151 16 6229