rocuinneagain
Forum Replies Created
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There are useful comparisons on this page: https://code.kx.com/pykx/1.3/comparisons.html
You can expose python function to q using embedpy
You can do it all in a q file or as I like to do split out to a .py and a .q
Such as: https://github.com/rianoc/qXML
kdb+ can also use websockets natively if needed
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- Is QLIC set?
- Was this licence issued specifying it was for a windows machine?
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What location is your licence file?
Have you set the QLIC environment variable?
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Have you installed embedpy?
https://code.kx.com/q/ml/embedpy/#build-and-install
Can you load and test it?
\l p.q p)print(1+1)
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Everything looks correct in that screenshot. You just need to open your web browser and enter
http://localhost:10001in your address bar.For starting KX Developer I wrote a simple
developer.batfile which I can double click to start both the developer and have my web browser open to the correct URL. You could do similar for KX Dashboards.My
developer.batcontains:call C:developerconfigconfig.bat start "developer" "q" C:developerlauncher.q_ start "" http:localhost:%developer_PORT%/ax
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This conversation could help:
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To launch
pyqyou need to call thepyqexecutable instead of thepythonexecutable.https://code.kx.com/q/interfaces/pyq/#quick-start
This:
$ pyq
Not this:
$ python
Related questions raised on stackoverflow.com
- kdb – How do i start KX Developer – Stack Overflow
- kdb – How do I install PYQ in Conda or Pycharm? – Stack Overflow
- kdb – KX Developer launcher error how can i fix it? – Stack Overflow
For Developer
https://code.kx.com/developer/getting-started/#starting-developer
You need to start it with
source /path-to-install-dir/config/config.profile q /path-to-install-dir/launcher.q_
For your SSH error this may help: How to install libssh2-1 on Ubuntu 20.04 (Focal Fossa)? (devmanuals.net)
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You need to run both commands in the same ssh terminal. It does not work when you do it in 2 different ones like you screenshot.
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The
qlanguage is documented with lots of learning materials on: https://code.kx.com/q/There are also courses on https://kx.com/academy/
kis the underlying language which you do not need to interact with. See this note: https://community.kx.com/t5/New-kdb-q-users-question-forum/rotate-function-differences-between-k-and-q/m-p/13186/highlight/true#M544 -
Only symbols. You can view their memory usage in
.Q.w[]- syms: number of interned symbols
- symw: bytes used by interned symbols
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q)h:hopen `::5678 q)h({set;`myVariable;1 2 3 4 5) /or q)h({x::y};`myVariable;1 2 3 4 5) -
lsofandnetstatcan give you information about the open handles even if you cannot connect yourself -
There are some notes on late data in this blog post: https://kx.com/blog/partitioning-data-in-kdb/
It outlines the basics of using lookup tables per partition.
Another option involves taking copies of HDB partitions and upserting the late data to the copy.
Then this new partition with extra data replaces the old one. Coordination is needed to ensure any HDB process reading the data does not error during this process.
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https://code.kx.com/q/basics/errors/#:~:text=conn,connections%20(1022%20max)
The conn error happens when the limit of 1022 open connections is hit.
Some process(es) must be continuously opening handles but not closing them after use.
You can count .z.W at any time to see how many open handles there are.
-38! can give you information on the type of each open handle.
At any time you can force close handles using hclose.
To trace the source of the problem you can add logging and monitoring to the port open and close call-backs, .z.po and .z.pc.
One example is the dotz library which you can customise to your needs.