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Hi Tomasz,
Perhaps I didn't explain it properly.
I understand the difference between the backfill and streeming.
I do just like you suggest in 1. However when the session starts and
AB does not update the recent data and AA scan will be performed on
the data that was in the AB database at the time when the backfill
was performed as you suggested in 1.
For example: backfill performed at 9.30am will update the database,
then I leave AB running and when the session starts at 9.30am the
only chart that is being updated is the one displayed. Then AA scan
at 10am with "wait for backfill" UNTICKED will do the scan on data
with the last data tick being 9.30am. Simple the database does NOT
contain the data between 9.30 and 10am and I don't get any signals
in my scan after 9.30am
Maybe I am missing here something, but there should be another tick
box called "update data from the last tick in the database until
NOW", and that would update only the last few minutes of data for
each symbol scanned.
I appreciate your help on this Tomasz.
Cheers,
Przemyslaw
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> Hello,
>
> You are mixing two completely different things:
> streaming with backfilling. Although many sources allows to stream
> hundreds of symbols, they usually are not able to BACKFILL
> more than very few (sometimes only 1) symbol at a time.
> The difference is so big because backfill for ONE symbol
> can be several megabytes in size. While streaming is just one
quote (few bytes) at a time.
>
> And QuoteTracker does not allow you to backfill more than once at
a time.
>
> What you should do is to TURN OFF
> "wait for backfill", because once data are backfilled there is no
need to backfill
> again. So procedure is as follows:
> 1. BEFORE trading session start just backfill all symbols
> 2. Turn OFF wait for backfill
> 3. From now on all scans will take few SECONDS for 60 symbols.
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "przemyslawuk" <przemyslawuk@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Tuesday, May 13, 2008 12:12 AM
> Subject: [amibroker] AA "wait for backfill" -how to sped up the
process???
>
>
> > Hello,
> >
> > I use AA and "wait for backfill" to fill the charts with data.
> > The problem is that AB does it sequentially - it requests
backfill,
> > collects the data,and then requests the backfill for another
symbol.
> > It is a very inefective way as IQFeed allows for hundreds of
symbols to
> > be watched at a time. This is done for example by QuoteTracker.
> > The AB process of scanning 60 symbols takes 18min.
> >
> > Is there a way of calling data update from AB for multiple
symbols at
> > a time so it does not have to be done sequentially?
> > Or maybe this is something for Tomasz to consider for future
versions
> > of AB.
> >
> >
> > Cheers,
> > Przemyslaw
> >
> >
> > ------------------------------------
> >
> > 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
> >
> >
> >
>
------------------------------------
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