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|link=Special:myLanguage/KMail Mail Client
Uses Akonadi to store emails
48px|link=Special:myLanguage/KAddressBook Contact Manager
Uses Akonadi to store contact information
48px|link=Special:myLanguage/KOrganizer Personal Organizer
Uses Akonadi to store calendars, events, journals, etc.
48px|link=Special:myLanguage/KJots Note Taking Application
Uses Akonadi to store notes
48px|link=Special:myLanguage/KAlarm Personal alarm scheduler
Uses Akonadi to store alarms
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
The Akonadi server is launched automatically at login whenever any Akonadi-enabled application requests access to it.
To disable the Akonadi subsystem, first, shut down the running Akonadi server from the control module or the command line:
Now, edit the file ~/.config/akonadi/akonadiserverrc and change StartServer from true to false:
The Akonadi server should no longer launch automatically on login.
Frequently Asked Questions
Where is my data now?
A full explanation of where the data is stored and Akonadi's interaction with it is available in Andras Mantia's blog
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.
High CPU or Memory usage
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.