Updated three of my KDE clients by terminal (not logged in by display 
manager/DM) and ran 

# systemctl restart mariadb.service && mariadb-upgrade -u root -p

as stated by pacman and arch-acnnounce. All went fine so far. No client starts 
or uses a mariadb service. But after logging in at DM and starting Kontact the 
drama begins: New Mails are shown but no one can be read and journal is showing 
lots of

Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver: DATABASE 
ERROR:
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver:   Error 
code: "1452"
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver:   DB 
error:  "Cannot add or update a child row: a foreign key constraint fails 
(`akonadi`.`parttable`, CONSTRAINT `parttable_ibfk_1` FOREIGN KEY (`pimItemId`) 
REFERENCES `pimitemtable` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)"
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver:   Error 
text: "Cannot add or update a child row: a foreign key constraint fails 
(`akonadi`.`parttable`, CONSTRAINT `parttable_ibfk_1` FOREIGN KEY (`pimItemId`) 
REFERENCES `pimitemtable` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) QMYSQL3: 
Unable to execute statement"
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver:   
Values: QMap((":0", QVariant(qlonglong, 345491))(":1", QVariant(qlonglong, 
9))(":2", QVariant(QByteArray, "Return-Path: 
<recei...@bla.com>\r\nDelivered-To: copy...@bla.com\r\nReceived: from localhost 
(localhost [127.0.0.1])\r\n\tby mail.sender.com (Postfix) with ESMTP id 
6E9EF624B8;\r\n\tFri, 28 Jun 2019 05:49:16 +0200 (CEST)\r\nDKIM-Filter: 
OpenDKIM Filter v2.11.0 mail.sender.com 6E9EF624B8\r\nDKIM-Signature: v=1; 
a=rsa-sha256; c=relaxed/relaxed; d=sender.com;\r\n\ts=mail; [...]
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver:   Query: 
"INSERT INTO PartTable (pimItemId, partTypeId, data, datasize, version) VALUES 
(:0, :1, :2, :3, :4)"
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver: Error 
during insertion into table "PartTable" "Cannot add or update a child row: a 
foreign key constraint fails (`akonadi`.`parttable`, CONSTRAINT 
`parttable_ibfk_1` FOREIGN KEY (`pimItemId`) REFERENCES `pimitemtable` (`id`) 
ON DELETE CASCADE ON UPDATE CASCADE) QMYSQL3: Unable to execute statement"
Jun 28 05:49:17 zotac3 akonadiserver[5774]: org.kde.pim.akonadiserver: Error 
while handling command CreateItem on connection akonadi_imap_resource_10 
(0x55f027a24a20)
Jun 28 05:49:17 zotac3 akonadi_imap_resource[1543]: org.kde.pim.akonadicore: 
Creating/updating items from the akonadi database failed: "Failed to insert new 
part into database."
Jun 28 05:49:17 zotac3 akonadi_imap_resource[1543]: org.kde.pim.akonadicore: 
Error during ItemSync:  "Failed to insert new part into database."


~/.local/share/akonadi/db_data/mysql.err is showing continuously
2019-06-28  6:14:21 10 [ERROR] Transaction not registered for MariaDB 2PC, but 
transaction is active


Stopping akonadi and therefore mariadb, then downgrading to mariadb* 10.3.16-1 
helped.
Looks like something's not really going together there yet.
-
Oliver

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