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Tomasz, thank for the prompt response. I currently don't need millisecond latency as my trades are not high frequency in nature. Anything under a few seconds is fine. Would you recommend using either the native DDE plug-in or ADK?
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> SQL database & ODBC is wrong path for high-perf RT.
>
> ODBC is rather slow as it was never designed by Microsoft to be used as a real-time streaming tool.
> Also all standard SQL databases are way too slow for real time applications.
>
> Only proprietary binary low-level dbs like AmiBroker own, that are very low level and not SQL based
> are able to offer right speed.
>
> As for interfaces - only direct APIs (like AmiBroker Dev Kit) that operate directly
> on binary data via direct pointers and no need for copying data and without SQL overhead are fast enough.
>
> For commercial databases that offer better performance than SQL see Berkeley DB
> http://www.oracle.com/database/berkeley-db/db/index.html
>
> (Read their white papers that explain why all relational, sql-based databases are simply too slow)
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "lucianomt" <lucianomt@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Monday, May 18, 2009 6:30 PM
> Subject: [amibroker] ODBC + DDE
>
>
> >I am trying to set up real-time feeds on AB. I have a SQL database that contains all the necessary data. The only problem is the
> >very high delay I get using the ODBC plug-in. To pull up about 1000 bars for 150 tickers takes approx. 10 minutes, which makes it
> >impractical for real-time. (The same process using local database takes 1 second.)
> >
> > So my first question is: am I doing something wrong? Is there any way to improve this performance significantly or is the ODBC
> > solution inherently slow?
> >
> > If nothing can be done to improve ODBC, I thought I could upload the historical data into the local database and them use a
> > different source, say DDE, to update the real-time quotes for the current day. Would that solution work?
> >
> > Please note that the historical data needs to be updated daily since it is a total-return series.
> >
> >
> >
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