Enabling MySQL 4-byte support
After installing there is this warning in the admin interface:
MySQL is used as database but does not support 4-byte characters. To be able to handle 4-byte characters (like emojis) without issues in filenames or comments for example it is recommended to enable the 4-byte support in MySQL. For further details read the documentation page about this.
And also:
Some columns in the database are missing a conversion to big int. Due to the fact that changing column types on big tables could take some time they were not changed automatically. By running
occ db:convert-filecache-bigint
those pending changes could be applied manually. This operation needs to be made while the instance is offline. For further details read the documentation page about this.
filecache.mtime
filecache.storage_mtime