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+# Error:
+#    InnoDB refuses to write tables with ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE
+
+# ---
+# see: https://dba.stackexchange.com/questions/256427/unable-to-create-tables-with-row-format-compressed
+# ---
+
+# If someone else stumbles across this thread (like me) looking for a solution to a
+#
+#    4047 InnoDB refuses to write tables with ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE
+#
+# or similar error from the mariadb for nextcloud, occurring whenever nextcloud tries to write to 
+# the DB: the important clue for me was, that this error might be related to an utf8 encoding issue. 
+#
+# See here for the nextcloud documentation:
+#    https://docs.nextcloud.com/server/21/admin_manual/configuration_database/mysql_4byte_support.html
+#
+#TL;DR:
+#
+# The solution from 
+#    https://help.nextcloud.com/t/update-to-next-cloud-21-0-2-has-get-an-error/117028/7
+# for me was :
+#
+#    php occ config:system:set mysql.utf8mb4 --type boolean --value="false"
+#
+# followed by
+#
+#    php occ maintenance:repair --include-expensive
+#
+# which may take a long time.
+#
+# this will fix all tables so that writing to them becomes possible again.