MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
If an error code is returned when issuing a backup request, the most likely cause is insufficient memory or disk space. You should check that there is enough memory allocated for the backup.
Important
If you have set
BackupDataBufferSize
and
BackupLogBufferSize
and their sum is greater than 4MB, then you must also set
BackupMemory as well.
You should also make sure that there is sufficient space on the hard drive partition of the backup target.
NDB does not support repeatable
reads, which can cause problems with the restoration process.
Although the backup process is “hot”, restoring an
NDB Cluster from backup is not a 100% “hot”
process. This is due to the fact that, for the duration of the
restore process, running transactions get nonrepeatable reads
from the restored data. This means that the state of the data is
inconsistent while the restore is in progress.