Since the past few days, the Akonadi server in my machine is crashing but it doesn't provide any helpful information. When trying to start it, it gives the following message:

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$ akonadictl start
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadiserver: Starting up the Akonadi Server...
org.kde.pim.akonadiserver: database server stopped unexpectedly
org.kde.pim.akonadiserver: Database process exited unexpectedly during initial connection!
org.kde.pim.akonadiserver: executable: "/usr/bin/mysqld"
org.kde.pim.akonadiserver: arguments: ("--defaults-file=/home/moose/.local/share/akonadi/mysql.conf", "--datadir=/home/moose/.local/share/akonadi/db_data/", "--socket=/run/user/1000/akonadi/mysql.socket", "--pid-file=/run/user/1000/akonadi/mysql.pid")
org.kde.pim.akonadiserver: stdout: ""
org.kde.pim.akonadiserver: stderr: ""
org.kde.pim.akonadiserver: exit code: 1
org.kde.pim.akonadiserver: process error: "Unknown error"
org.kde.pim.akonadiserver: Failed to remove runtime connection config file
org.kde.pim.akonadiserver: Shutting down AkonadiServer...
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadiserver' exited normally...

The only message above that sounds useful is:

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Failed to remove runtime connection config file

However, I have been Googling about this since several days but am unable to find any information about this particular case. It was running perfectly well until a few days back. Any suggestions would be appreciated.

Ok, I figured it out. I had percona-server installed instead of mariadb. I did a quick swap and rebooted the machine and it is sweet now.