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[amibroker] Re: Speed the database!?



PureBytes Links

Trading Reference Links

You are probably using custom charts/indicators taking forever to 
execute. Just load your panes with amibroker chart/indicators and 
you"ll be allright!

Adrian


--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> 
wrote:
>
> IMHO it looks like you have virus on your computer that is busy 
infecting all files on your hard disk.
> 
> 10 seconds is what it takes to scan 1000 symbols on my end using 
QP2 database.
> 
> Best regards,
> Tomasz Janeczko
> amibroker.com
>   ----- Original Message ----- 
>   From: Louis Préfontaine 
>   To: amibroker@xxxxxxxxxxxxxxx 
>   Sent: Monday, July 21, 2008 2:00 AM
>   Subject: Re: [amibroker] Speed the database!?
> 
> 
>   Right now I am trying to scroll and it takes like 10 seconds (no 
joke!) to move...  And I hear my computer loading, loading, loading...
> 
>   Hmm...
> 
>   Louis
> 
> 
>   2008/7/20 Louis Préfontaine <rockprog80@xxx>:
> 
>     Hi Tomasz,
> 
>     I thought that once I imported Metastock files the data was 
going into my AB database.  In fact, when I manually open AB 
database's folder, I see each and every ticker.  Are you sure the 
data is in the Metastock files at that point?  (The speed issue is 
not in Real-time, but in my database that goes from last July till 
last week).
> 
>     Scrolling is not immediate in my AB, even for charts with only 
price and MA and portfolio equity.  It takes some time to lead when I 
scroll.
> 
>     I defragmented my hard drive, but still it is slow...
> 
>     Any idea?
> 
>     Thanks,
> 
>     Louis
> 
> 
> 
> 
>     2008/7/20 Tomasz Janeczko <groups@xxx>:
> 
> 
> 
>       No, they are NOT in AB local database. QCollector stores data 
into Metastock databases and you
>       are accessing external MS database.
> 
>       Also scrolling is *immediate* for any formula shipped with 
AB. 
>       If it is not on your end, it means that you are using
>       some formula of your own writing (or downloaded from 
somewhere) that takes forever
>       to execute. 
> 
>       Faster? Use AmiBroker own IQFeed plugin, without man-in-the-
middle (QCollector).
>       Still MS database should be fast enough, if it is not - it 
means that your hard disk is badly fragmented.
> 
>       Best regards,
>       Tomasz Janeczko
>       amibroker.com
>         ----- Original Message ----- 
>         From: Louis Préfontaine 
>         To: amibroker@xxxxxxxxxxxxxxx 
>         Sent: Sunday, July 20, 2008 4:05 PM
>         Subject: Re: [amibroker] Speed the database!?
> 
> 
>         Also, when I right-click to change the time displayed, it 
takes 3-4 seconds and lot of loading... Any way to speed this?
> 
>         Thanks,
> 
>         Louis
> 
> 
>         2008/7/16 Louis Préfontaine <rockprog80@xxx>:
> 
>           Hi Tomasz,
> 
>           I am using data that has already been downloaded with 
QCollector.   Hence, I am running on a local database and what takes 
like 3-4 seconds is scrolling through the 1-minute bars.  Let's say 
it is Day 1 at 11:00  and I want to scroll back to Day 0, I use my 
mouse wheel but for 3-4 seconds the images does not move at all, then 
I hear my computer loading, then I see the bars before.  Is there a 
way to make that faster?
> 
>           Thanks,
> 
>           Louis
> 
> 
>           2008/7/15 Tomasz Janeczko <groups@xxx>: 
> 
> 
> 
>             Hello,
> 
>             No, it does NOT take 3-4 seconds to load each ticker. 
Loading (i.e. switching between symbols) is INSTANT.
> 
>             It takes 3-4 to BACKFILL. That's huge difference. 
> 
>             Are you aware that you are on 256kbps connection. That 
means that your fully saturated connection is able
>             to deliver about 25KB of data per second.  Now do you 
have any idea how much data is one day
>             of 1-minute data? 
> 
>             As far as I remember you are using IQFeed. It delivers 
data in ASCII format. 
> 
>             Let's say single quote line is 100 bytes.  Compressed 
it is 50. Now there are 60 lines per minute and
>             480 lines per 8 hours. That's 24KB PER DAY PER SYMBOL 
of 1-minute data. That means
>             that it takes 1-second FULLY SATURATED your internet 
connection to deliver 1-day worth of 1-minute data for one symbol.
>             That's physical limit of your internet connection.
> 
>             Yes there is a way to get it faster:
>             a) invest in better internet connection
>             b) subscribe to data source that allows those 500 
symbols to be streaming
>             c) run scan with wait for backfill PRIOR to market 
open. Once you initialy scan all symbol
>             UNCHECK "wait for backfill" and scans will fun blazing 
fast.
> 
>             Best regards,
>             Tomasz Janeczko
>             amibroker.com
>               ----- Original Message ----- 
>               From: Louis Préfontaine 
>               To: amibroker@xxxxxxxxxxxxxxx 
>               Sent: Monday, July 14, 2008 11:02 PM
>               Subject: [amibroker] Speed the database!?
> 
> 
>               Hi,
> 
>               I have my 1-minute database setted with all my 
tickers and everything, but damn it it is so slow!  It takes like 3-4 
seconds to load each ticker...  Is there a way to make it run faster, 
considering I don't need all the data when exploring?
> 
>               Thanks,
> 
>               Louis
>



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