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149 results
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KDB+ and hyperthreading

by jlucid in kdb+ and q
yesterday
yesterday
I'm looking for information regarding hyperthreading with kdb+, main questions below   1) Does it cause any issues when enabled? 2) Does it impact the license in any way. 3) Are there any ...
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  • Labels:
  • Hyperthreading

ODBC setup for KDB+ to query other databases

by darrenwsun in kdb+ and q
a week ago
a week ago
Hi community, There used to be this link that provides the instructions for the setup, but it's no longer valid and I cannot find out the updated link anywhere. Note that it's for the reverse direc...
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  • Labels:
  • T

Why does the amend form of dot operator creates a ...

by kdb_newbie in kdb+ and q
4 weeks ago
4 weeks ago
Labels:
  • Labels:
  • Apply

HDB - map sym to int for partitioning

by erichards in kdb+ and q
a month ago
2 Kudos
a month ago
2 Kudos
Our access patterns are heavily based upon accessing one sym for a long history, rather than accessing everything for a given date. As such it would be massively more efficient for us to partition ...
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  • Labels:
  • best practice request

{$["j";x in V]'[x;"_"]} / Case

by kdb_newbie in kdb+ and q
‎2023.02.19 05:33 AM
‎2023.02.19 05:33 AM
https://code.kx.com/q/learn/reading/strings/#c_ns_n_nts  {$["j";x in V]'[x;"_"]} / Case May I ask how does each both work here please? 
Labels:
  • Labels:
  • iterators

How the sym file reads data from partition table?

by hzadonis369 in kdb+ and q
a month ago
a month ago
Hi, Masters:   Last week, I created a partition table to store fundmental data, for example, Sector A has 10 equities and Sector B has 8 equities. The data changed day by day and was loaded by...
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  • Labels:
  • sym file

Qt QWebSockets with kdb+

by odriscog in kdb+ and q
‎2023.02.16 07:01 AM
‎2023.02.16 07:01 AM
Hello there, I am trying to connect to kdb process from C++ (using the Qt framework) using the very simple example provided by Qt for their QWebSocket class here: https://doc.qt.io/qt-6/echocl...
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  • Labels:
  • websocket

kdb+ and websockets

by jlucid in kdb+ and q
‎2023.02.07 02:09 AM
‎2023.02.07 02:09 AM
The syntax notion for opening a websocket is given as follows r:(`$":ws://host:port")"GET / HTTP/1.1\r\nHost: host:port\r\n\r\n" but what is the format if I want to connect with a specific URL an...
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  • Labels:
  • websocket

How to re-subscription automatically in kdb-tick?

by k-mambo in kdb+ and q
‎2023.02.02 04:11 AM
‎2023.02.02 04:11 AM
I understand that kdb-tick should be run in order from ticker. However, if ticker is terminated for some reason, rdb does not subscribe to the re-run ticker.  Need a way to re-subscribe or ...
Labels:
  • Labels:
  • best practice request

Beef with apply (@ and .)

by simon_watson_sj in kdb+ and q
‎2023.01.01 09:10 PM
1 Kudo
‎2023.01.01 09:10 PM
1 Kudo
...ssspsfffffffssg"; ````````````````; ``g```s```````````; 0000000000000000b; 0N 0N 0N 0N -1 0N 0N 0N 0N 0N 0N 0N 0N 0N 0N 0Ni; 1 0N 0N 0N -1 0N 0N 0N 0N 0N 0N 0N 0N 0N 0N 0...
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