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If you display chart for the first time since AB start IQfeed will always
backfill because in most cases you have gap in the data since you were last running AB
so backfill is necessary regardless of the fact if symbols was or wasn't in RT quote.
Also since there are many pages in RT quote and you may have way more symbols
in RT quote window pages than your subscription limit, there is no guarantee
that given symbol was indeed streamed non-stop or was unsubscribed and re-subscribed
automatically as pages were switched. All this causes that backfill is necessary
anyway to maintain gap-free operation.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "przemyslawuk" <przemyslawuk@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, November 07, 2008 11:18 AM
Subject: [amibroker] Re: what does AB do when "wait for backfill" is NOT ticked ?
> Hello,
>
> If I don't have a chart open but the symbol is in my RT quote window
> than it is streaming.
> However if I open the chart of that symbol after 1 hour of watching it
> in RT quote window the data is NOT on the chart, the chart hast to
> wait to update the data from the last hour.
> So what happened to the data that was streaming for 1 hour in RT quote
> window?
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>
>> 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@xxx>
>> 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?
>> >
>> >
>> >
>> > ------------------------------------
>> >
>> > **** 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/
>> >
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>> > http://www.amibroker.com/support.html
>> >
>> > *********************************
>> > Yahoo! Groups Links
>> >
>> >
>> >
>>
>
>
>
> ------------------------------------
>
> **** 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
>
> *********************************
> Yahoo! Groups Links
>
>
>
------------------------------------
**** 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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