This block is responsible for handling online backups and
checkpoints. It is found in
contains the following files:
Backup.cpp: Defines methods for node signal handling; also provides output methods for backup status messages to user.
BackupFormat.hpp: Defines the formats used for backup data,
.CTL, and log files.
Backup.hpp: Defines the
Backupclass constructor is found here.
Backup.txt: Contains a backup signal diagram (text format). Somewhat dated (from 2003), but still potentially useful for understanding the sequence of events that is followed during backups.
FsBuffer.hpp: Defines the
FsBufferclass, which implements the circular data buffer that is used (together with the NDB file system) for reading and writing backup data and logs.
read.cpp: Contains some utility functions for reading log and checkpoint files to
QBACKUP is a subtype of this block, used for
query and recovery threads, added in NDB 8.0.23.