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Querying MySQL programmatically

To connect to the MySQL programmatic endpoint, you need a MySQL client (command line, graphical or program library) and SSH installed on your machine.

Connection details

To obtain access, please send us your public key as described here.

  1. When we contact you back, you will be able to setup an SSH tunnel with the following command: ssh -L 3306:web.ghtorrent.org:3306 [email protected]. Keep in mind that no shell will be allocated in the open SSH session.

  2. You will then be able to connect to our server using the command: mysql -u ght -h 127.0.0.1 ghtorrent (user name: ght, no password, database: ghtorrent).

Here is an example session:

{% highlight bash%}

on terminal session 1

$ ssh -L 3306:web.ghtorrent.org:3306 [email protected] PTY allocation request failed on channel 2

on a different terminal

$ mysql -u ght -h 127.0.0.1 ghtorrent Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1004 Server version: 5.5.5-10.1.11-MariaDB-1~wily mariadb.org binary distribution

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show tables; +-----------------------+ | Tables_in_ghtorrent | +-----------------------+ | commit_comments | [...] | users | | watchers | +-----------------------+ 21 rows in set (0.20 sec)

{% endhighlight %}

Database schema

Have a look here.

Things to keep in mind

  1. The hosting machine, while powerful, is not capable of processing the data very quickly.

  2. Other people may be using the machine as well. Make sure that you do not run very heavy queries. It is better to run many small queries (e.g. in a loop) than aggregation queries. Make sure you only query on indexed fields.

  3. Queries running in excess of 100 seconds are killed without any warning.

  4. At any time the machine may become unavailable.

  5. The data is provided in kind to help other people to do research with Please do not abuse the service.

  6. The data is offered as is without any explicit or implicit quality or service guarantee from our part.

  7. All operations are logged for security purposes.