Thanks TJ. So as a DB management strategy, it's best to perhaps have a large DB for backtesting purposes only... and a much smaller DB for live trading, charting, symbol swithcing etc..etc...??
Thanks --- In [email protected], "Tomasz Janeczko" <[EMAIL PROTECTED]> wrote: > > Using 10x more data per symbol will give you slow down in all areas. > 2 million bars is 64 MB per symbol of quote data and 8 MB per single AFL array > (if quickafl is not used). As formulas depending on complexity can use hundreds of arrays > this means approaching gigabytes of RAM. > Handling that much of data is not "easy". Remember than RAM bandwidth > is limited to few GB per second. Therefore just accessing that amount > of data is question of seconds, not counting the calculations. > > Best regards, > Tomasz Janeczko > amibroker.com > ----- Original Message ----- > From: "sidhartha70" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Thursday, August 21, 2008 2:48 PM > Subject: [amibroker] Re: Size of Database... > > > > Anyone...? > > > > Many Thanks > > > > --- In [email protected], "sidhartha70" <sidhartha70@> wrote: > >> > >> This may have been answered before, but... > >> > >> I set up two DB's in AB... both IQ Feed tick DB's. > >> > >> 1. Is 200,000 bars per symbol. > >> 2. The second is 2,000,000 per symbol. > >> > >> Practially, operationally, where will AB be slower in the use of the > >> second DB...?? In charting? Backtesting (obviosuly)? In symbol > >> switching etc...? > >> > >> I'm just trying to work out how motivated I should be to have small > >> DB's... > >> > >> Thanks > >> > > > > > > > > ------------------------------------ > > > > Please note that this group is for discussion between users only. > > > > To get support from AmiBroker please send an e-mail directly to > > SUPPORT {at} amibroker.com > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > http://www.amibroker.com/devlog/ > > > > For other support material please check also: > > http://www.amibroker.com/support.html > > Yahoo! Groups Links > > > > > > >
