RE: [amibroker] Speed issues with Premium Data, AmiBroker Email List Archive

Hi Tomasz,

We have just released our comprehensive US listed + delisted stock database back to 1950. This has over 37000 symbols in it and comprises almost 2GB of data in MetaStock format. However, the in-memory cache size “max symbols” setting is limited to 20000 symbols – is it possible to increase this number for those of our users with plenty of RAM to burn?

Best regards,
Richard Dale.
Norgate Investor Services
- Premium quality Stock, Futures and Foreign Exchange Data for
markets in Australia, Asia, Canada, Europe, UK & USA -
www.premiumdata.net

From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Tomasz Janeczko
Sent: Friday, 11 April 2008 4:05 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Speed issues with Premium Data

Yes, for best results increase both, however do not enter more than your RAM size is because then Windows would swap to hard disk anyway.

Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----

From: ges x

To: amibroker@xxxxxxxxxxxxxxx

Sent: Thursday, April 10, 2008 9:44 PM

Subject: Re: [amibroker] Speed issues with Premium Data

Thank you, Tomasz, I'll try that. Do I also need to change the "in memory cache size (max. symbols)"?

The PremiumData database with all the backlisted symbols is huge, so maybe I just haven't sized the data preferences big enough.

ges

On Thu, Apr 10, 2008 at 12:59 PM, Tomasz Janeczko <groups@xxxxxxxxxxxxx> wrote:

If you want caching and faster use of MS databases, go to File->Database Settings
and change "Local database storage" to "Enabled", also you may go to
Tools->Preferences->Data and increase 'in-memory cache'.

Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----
From: "ges" <ges8ges@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Thursday, April 10, 2008 8:36 PM
Subject: [amibroker] Speed issues with Premium Data

> I've used QuotesPlus with AB for quite a while and just got
> PremiumData's historical data and delisted data and am having speed
> problems with PremiumData.
>
> With QuotesPlus, after the first run of an exploration or backtest, AB
> keeps the data in memory and subsequent runs are very fast and there
> is not the constant disk access to bog the computer down when doing
> other tasks.
>
> With PremiumData I can't get the same behavior. Is this because the
> PremiumData data is in Metastock format? Or is it my database settings?
>
> I have tried changing the database settings every way I can think of,
> but I can't get AB to handle the PremiumData the same speedy way that
> id does QP data.
>
> Is there some change to database prefs/settings that will allow AB to
> keep the PremiumData in memory or is this just a limitation of the
> Metastock data format?
>
> Thanks for any suggestions.
>
> ges