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Hello,
Wait for backfill is explained in the User's Guide:
http://www.amibroker.com/guide/h_rtsource.html
It does what it says: it causes that Auto-analysis WAITS for backfill to complete
before processing given symbol.
If it is not checked it goes on with processing without waiting.
Backfill request is still sent and data may arrive later on if data source
allows multiple parallel backfills, but AA does not wait and will process data that
were in the database prior to backfill.
All data requested and received from external source are saved regardless of 'wait for backfill' setting.
The only setting that matters for saving is "Enable local storage" in Database Settings.
See this:
http://www.amibroker.com/guide/h_workspace.html
Streaming is independent and is started automatically for every symbol
that is displayed on any chart or is present in RT quote window or
is scanned by AA (upto the limit of symbols that your RT subscription has)
See also:
http://finance.groups.yahoo.com/group/amibroker/message/126873
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "przemyslawuk" <przemyslawuk@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, November 07, 2008 12:48 AM
Subject: [amibroker] what does AB do when "wait for backfill" is NOT ticked ?
> Does anyone know what does AB do when during the scan, during the
> market hours the "wait for backfill" option is not ticket? Say I have
> 1 chart on the screen and 10 symbols in the scan.
> They will appear in the IQ connection manager after the first run of
> the scan.
> 1. Does it mean that they will stream?
> 2. Will the data be saved to the AB database?
> 3. Is the scan working on the real time data or on the data from the
> last backfill?
> I am asking about it because, say I run scan on those 10 symbols every
> 5 min for 1 hour and then when I open a chart of say 6th symbol I have
> to wait for the data to arrive.
> 4. After one hour of such scanning what is the last bar used in the scan?
> 5. Does the scan run on the data saved in the database or does it also
> include the data unsaved?
> I read that with "wait for backfill" not ticket AB does not wait for
> backfill but if symbols are streaming (which to my understanding
> should be initiated after the first run of the scan) there is nothing
> to wait for , because "the symbols are streaming live all the time".
> Am I correct?
>
> 6. If I watch one chart for the whole day is the data being saved to
> the database at any point or is it in my PC's memory?
>
>
>
> ------------------------------------
>
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>
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>
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>
------------------------------------
**** IMPORTANT ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
*********************
TO GET TECHNICAL 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
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