Create mysqldump backup - innodb_large_prefix problem

[zerone]

try this:
sudo -u www-data php occ maintenance:repair
if get error the try to fix it
if there is not try:

@snake29

SOLUTION:

$ sudo mysql -u root -p
MariaDB [(none)]> use nextcloud;
MariaDB [nextcloud]> set global innodb_large_prefix=on;
MariaDB [nextcloud]> set global innodb_file_format=Barracuda;
$ sudo -u www-data php occ maintenance:repair

if not then try:

@SmallOne

[mysqld]
innodb_large_prefix=true
innodb_file_format=barracuda
innodb_file_per_table=1

or maybe this:

How to enable large index in MariaDB 10?

good luck