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How to fix Nextcloud 4047 InnoDB refuses to write tables with ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE.

Problem:

When trying to maintenance:repair your Nextcloud instance, e.g. during a utf8mb4 upgrade, you see an error message like

innodb_error.txt
ERROR: An exception occurred while executing a query: SQLSTATE[HY000]: General error: 4047 InnoDB refuses to write tables with ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE.

Solution

You need to turn off innodb-read-only-compressed. I do this by starting my MySQL docker with

mysql_command.txt
--skip-innodb-read-only-compressed

Full command line which worked for me:

mysql_full_flags.txt
--transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-file-per-table=1 --skip-innodb-read-only-compressed

Full docker-compose.yml nextcloud section:

docker_compose_nextcloud.yml
nextcloud-db:
  image: mariadb
  command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-file-per-table=1 --skip-innodb-read-only-compressed
  restart: always
  volumes:
    - ./nextcloud-db:/var/lib/mysql
  environment:
    - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
    - MYSQL_PASSWORD=${MYSQL_PASSWORD}
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