25.6.8.3 Configuration for NDB Cluster Backups

Five configuration parameters are essential for backup:

• BackupDataBufferSize

  The amount of memory used to buffer data before it is written to disk.

• BackupLogBufferSize

  The amount of memory used to buffer log records before these are written to disk.

• BackupMemory

  The total memory allocated in a data node for backups. This should be the sum of the memory allocated for the backup data buffer and the backup log buffer.

• BackupWriteSize

  The default size of blocks written to disk. This applies for both the backup data buffer and the backup log buffer.

• BackupMaxWriteSize

  The maximum size of blocks written to disk. This applies for both the backup data buffer and the backup log buffer.

In addition, CompressedBackup causes NDB to use compression when creating and writing to backup files.

More detailed information about these parameters can be found in Backup Parameters.

You can also set a location for the backup files using the BackupDataDir configuration parameter. The default is FileSystemPath/BACKUP/BACKUP-backup_id.

You can enforce encryption of backup files by setting RequireEncryptedBackup to 1; this prevents the creation of backups without specifying ENCRYPT PASSWORD=password as part of a START BACKUP command.