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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 amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> 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" <sidhartha70@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, August 21, 2008 2:48 PM
> Subject: [amibroker] Re: Size of Database...
>
>
> > Anyone...?
> >
> > Many Thanks
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "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
> >>
> >
> >
> >
> > ------------------------------------
> >
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> > To get support from AmiBroker please send an e-mail directly to
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> >
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> >
> >
> >
>
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