How to Download and Install Q KDB+
If you are looking for a powerful database and programming language that can handle streaming, real-time, and historical data, you might want to check out Q KDB+. In this article, we will explain what Q KDB+ is, why you might want to use it, and how to download and install it on your computer.
What is Q KDB+?
Q KDB+ is a combination of two components: Q and KDB+.
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A brief introduction to Q
Q is a general-purpose programming language that is based on the language K, which is a terse variant of the language APL. Q is a thin wrapper around K, providing a more readable, English-like interface. Q is designed for high-performance, in-database analytics, and can manipulate large amounts of data with minimal code. Q also serves as the query language for KDB+, allowing you to perform complex operations on tables and databases with simple syntax.
A brief introduction to KDB+
KDB+ is a database system that is optimized for time-series data. It can store and process data in-memory or on disk, using a column-based structure that allows for fast and efficient compression and retrieval. KDB+ can handle billions of records per second, making it ideal for applications that require high-frequency data analysis, such as finance, IoT, or machine learning. KDB+ also supports distributed computing, allowing you to scale up your system by adding more nodes.
Why use Q KDB+?
Q KDB+ offers several advantages over other database and programming solutions, such as:
Speed: Q KDB+ can process large volumes of data in real-time, thanks to its vector-based operations, columnar storage, and in-memory caching.
Flexibility: Q KDB+ can handle any kind of data, from structured to unstructured, from numerical to textual, from static to streaming.
Simplicity: Q KDB+ has a concise and expressive syntax that allows you to write less code and do more with it. You can also use Q as a standalone programming language for any purpose.
Scalability: Q KDB+ can run on any platform, from laptops to servers, and can easily scale up by adding more nodes or using cloud services.
How to download Q KDB+?
If you are interested in trying out Q KDB+, you have two options: personal edition or commercial edition.
Download options
Personal edition
The personal edition of Q KDB+ is free for non-commercial use. It comes with a 64-bit interpreter that requires an always-on internet connection and a license key file. You can download it from . The personal edition is not licensed for use on cloud servers.
Commercial edition
The commercial edition of Q KDB+ is available for customers who have purchased a license from KX Systems. It comes with 32-bit or 64-bit interpreters that do not require an internet connection and a license key file. You can download it from . You will need credentials from your designated contact to access the site. The commercial edition can be used on cloud servers.
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Download steps
The download steps for both editions are similar. You will need to unzip the downloaded ZIP file to produce a folder named q in your install location. Here we assume you install Q KDB+ in your HOME directory on your Linux, macOS, or Windows system. The steps for each system are as follows:
Linux
On Linux, you can use the following commands to download and unzip the ZIP file:
wget # for personal edition wget # for commercial edition unzip q.zip -d /q
macOS
On macOS, you can use the following commands to download and unzip the ZIP file:
curl -O # for personal edition curl -O # for commercial edition unzip q.zip -d /q
Windows
On Windows, you can use a web browser to download the ZIP file from the links above, and then use a tool like WinZip or 7-Zip to unzip the file to your HOME directory (usually C:\Users\yourname).
How to install Q KDB+?
Once you have downloaded and unzipped Q KDB+, you need to do a few more steps to install it properly.
Install steps
The install steps for both editions are similar. You will need to copy the license key file to your q folder, confirm that Q KDB+ works, and edit your profile to set some environment variables. Here we assume you install Q KDB+ in your HOME directory on your Linux, macOS, or Windows system. The steps for each system are as follows:
Linux
On Linux, you can use the following commands to install Q KDB+:
cp k4.lic /q # copy the license key file /q/l64/q # run Q KDB+ \l sp.q # load an example script sp)select from trade # run a query exit 0 # exit Q KDB+ echo 'export QHOME=/q' >> /.bashrc # set QHOME variable echo 'export PATH=$PATH:$QHOME/l64' >> /.bashrc # add Q KDB+ to PATH source /.bashrc # reload your profile
macOS
On macOS, you can use the following commands to install Q KDB+:
cp k4.lic /q # copy the license key file /q/m64/q # run Q KDB+ \l sp.q # load an example script sp)select from trade # run a query exit 0 # exit Q KDB+ echo 'export QHOME=/q' >> /.bash_profile # set QHOME variable echo 'export PATH=$PATH:$QHOME/m64' >> /.bash_profile # add Q KDB+ to PATH source /.bash_profile # reload your profile
Windows
On Windows, you can use the following steps to install Q KDB+:
Copy the license key file k4.lic to your q folder (usually C:\Users\yourname\q).
Double-click on q.exe in your q folder to run Q KDB+.
Type \l sp.q in the console to load an example script.
Type sp)select from trade in the console to run a query.
Type exit 0 in the console to exit Q KDB+.
Right-click on This PC and select Properties.
Select Advanced system settings and then Environment Variables.
Add a new user variable named QHOME with value C:\Users\yourname\q.
Edit the user variable named PATH and append ;C:\Users\yourname\q\w64 to it.
Click OK to save the changes and close the windows.
Install the license key file
The license key file k4.lic is required for both editions of Q KDB+. It contains information about your license type, expiration date, and machine ID. You need to copy this file to your q folder before running Q KDB+. If you don't have this file, you can request one from for personal edition or from your designated contact for commercial edition. You can also check your license status by typing \v in the console after running Q KDB+.
Confirm success
To confirm that Q KDB+ is installed correctly and works as expected, you can run an example script that comes with the package. The script is called sp.q and it creates a sample database with some tables and data. You can load this script by typing \l sp.q in the console after running Q KDB+. You can then query the database using Q syntax. For example, you can type sp)select from trade to see the trade table, or sp)select sum size by sym from trade to see the total size of trades by symbol. You can also use Q functions and operators to manipulate the data. For example, you can type sp)select avg price by sym from trade where date=2023.06.21 to see the average price of trades by symbol for today's date.
Edit your profile
To make it easier to run Q KDB+ from any terminal or command prompt, you need to edit your profile and set some environment variables. The most important one is QHOME, which tells Q KDB+ where to find your q folder. You also need to add Q KDB+ to your PATH, which tells your system where to find the q executable. The steps to do this vary depending on your system, as shown above.
Conclusion
Q KDB+ is a powerful database and programming language that can handle streaming, real-time, and historical data. It offers speed, flexibility, simplicity, and scalability for data analysis and processing. In this article, we have shown you how to download and install Q KDB+ on your Linux, macOS, or Windows system. We hope you have found this article helpful and informative. If you have any questions or feedback, please feel free to contact us.
FAQs
What are the system requirements for Q KDB+?
Q KDB+ can run on any system that supports a C compiler and has at least 512 MB of RAM. However, for optimal performance, you should have a 64-bit system with at least 4 GB of RAM and a fast processor.
How can I learn more about Q KDB+?
You can visit the on Q KDB+.
How can I get support for Q KDB+?
If you are a commercial customer, you can contact your designated contact for technical support. If you are a personal user, you can use the tag to ask questions and get answers from other users.
How can I update Q KDB+?
You can check for updates on the for personal edition. You will need to download the latest ZIP file and unzip it to your q folder, replacing the old files. You will also need to copy the license key file again.
How can I uninstall Q KDB+?
You can uninstall Q KDB+ by deleting the q folder from your install location. You should also remove the QHOME and PATH variables from your profile.
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