From User talk:Krop Revision as of 14 March 2019 at 14:45.The highlighted comment was edited in this revision. [diff] This guide describes the steps needed in order to upgrade your Akonadi database when using the PostgreSQL backend. In order to use this guide, you need to have both the old and new PostgreSQL versions installed. The applications paths mentioned in this guide are valid for openSUSE users. You may have to change the executable paths for your distribution. Stop the Akonadi services akonadictl stop (wait until all the akonadi processes are gone) Create an extra backup cp -R $HOME/.local/share/akonadi/db_data $HOME/.local/share/akonadi/db_data_10 Rename the Akonadi database directory mv $HOME/.local/share/akonadi/db_data $HOME/.local/share/akonadi/db_data_old Create the new database, using the postgreSQL 11 executable /usr/lib/postgresql11/bin/initdb --pgdata=$HOME/.local/share/akonadi/db_data --locale=en_US.UTF-8 Do NOT change the --locale value. Check if upgrading is safe /usr/lib/postgresql11/bin/pg_upgrade -b /usr/lib/postgresql10/bin -B /usr/lib/postgresql11/bin -d $HOME/.local/share/akonadi/db_data_old -D $HOME/.local/share/akonadi/db_data --check For more details about this command, check the pg_upgrade documentation. If pg_upgrade doesn't detect any problem, you may start the database upgrade /usr/lib/postgresql11/bin/pg_upgrade -b /usr/lib/postgresql10/bin -B /usr/lib/postgresql11/bin -d $HOME/.local/share/akonadi/db_data_old -D $HOME/.local/share/akonadi/db_data Last steps, starting akonadi akonadictl start and running the consistency check akonadictl fsck After checking that your applications work as usual, you may delete the two backup copies you created earlier. HistoryKrop (talk) 14:39, 14 March 2019 Retrieved from "https://userbase.kde.org/Thread:User_talk:Krop/Akonadi_/_PostgreSQL_upgrade"