The datasource with ID 'elstut--entity:node' could not be retrieved for index (Drupal, Solr)

/usr/sbin/mariadbd --help --verbose | grep "query.*size"

Commandline:

systemctl restart mariadb

After my changes in /etc/mysql/db-performance.cnf

Error:

PHP 8.3 extra packages (+ pecl, apcu)

apt update
apt install plesk-php83-dev zlib1g-dev

I get this error, when I visit https://solr.example.com:8983 :

Remove all files starting with 2024 in mydir123 and show the number of deleted files:

find mydir123 -name '2024*' -exec rm -vf {} \; | wc -l

find . -name '*' | xargs rm -v

https://www.drupal.org/project/tablefield/issues/3397688

 Edit "/etc/my.cnf" ( under [mysqld] ):

transaction_isolation="READ-COMMITTED"

Restart MariaDB / MySQL: