Nextcloud adminsitration page shows the following waring:
The database is missing some indexes. Due to the fact that adding indexes on big tables could take some time they were not added automatically. By running "occ db:add-missing-indices" those missing indexes could be added manually while the instance keeps running. Once the indexes are added queries to those tables are usually much faster. Missing optional index "mail_messages_msgid_idx" in table "mail_messages". Missing optional index "fs_storage_path_prefix" in table "filecache".
Solution
Login to your Nextcloud system and use the command "
sudo -u www-data php /var/www/nextcloud/occ db:add-missing-indices" to fix it.root@nextcloud:~#
root@nextcloud:~# sudo -u www-data php /var/www/nextcloud/occ db:add-missing-indices
Adding additional mail_messages_msgid_idx index to the oc_mail_messages table, this can take some time...
oc_mail_messages table updated successfully.
Adding additional fs_storage_path_prefix index to the oc_filecache table, this can take some time...
oc_filecache table updated successfully.
root@nextcloud:~#
