The Akonadi framework is responsible for providing applications with a centralized database to store, index and retrieve the user's personal information. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, etc. In SC 4.4, KAddressBook became the first application to start using the Akonadi framework. In SC 4.7, KMail, KOrganizer, KJots, etc. were updated to use Akonadi as well. In addition, several Plasma widgets also use Akonadi to store and retrieve calendar events, notes, etc.
At the time of writing, the following applications are enabled to use the Akonadi framework to centrally store and access user data. Follow through to each application's page to learn more.
48px Mail Client
Uses Akonadi to store emails
Uses Akonadi to store contact information
48px Personal Organizer
Uses Akonadi to store calendars, events, journals, etc.
48px Note Taking Application
Uses Akonadi to store notes
In addition to this, plasma widgets like the Digital Clock widget, the Notes widget also use Akonadi to store and retrieve events and notes.
Controlling the Akonadi server
The Akonadi control module in System Settings provides an easy means to starting, stopping, restarting and querying the status of the Akonadi server. You may also accomplish this from the commandline using the command akonadictl.
To start the Akonadi server,
To stop the Akonadi server,
To restart a running Akonadi server,
To query the status of the Akonadi server,
Disabling the Akonadi subsystem
Shut down the Akonadi server from the control module or the command line:
Now, to disable autostarting the Akonadi server during login, edit the file ~/.config/akonadi/akonadiserverrc and change StartServer from true to false:
The Akonadi server will no longer launch automatically.
Frequently Asked Questions
Refer to the Troubleshooting page for resolving glitches during migration. Akonadi's Glossary entry has a brief description of its purpose and other useful links. This page explains how Akonadi and KAddressBook work together.
If you are experiencing 100% CPU usage by the virtuoso-t process when using Akonadi and related applications, try this proposed workaround while it is being investigated: In KRunner's configuration page, disable the Nepomuk search plugin and the Contact plugin. Then, log out and back in. For further information and inputs, report back here or on the Forum or on the IRC channel #kontact.