MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
The logbuffer table provides information on
NDB Cluster log buffer usage.
The logbuffers table contains the following
columns:
node_id
The ID of this data node.
log_type
Type of log, one of: REDO or
DD-UNDO.
log_id
The log ID.
log_part
The log part number.
total
Total space available for this log.
used
Space used by this log.
Beginning with NDB 7.6.5, logbuffers table
rows reflecting two additional log types are available when
performing an NDB backup. One of these rows has the log type
BACKUP-DATA, which shows the amount of data
buffer used during backup to copy fragments to backup files. The
other row has the log type BACKUP-LOG, which
displays the amount of log buffer used during the backup to
record changes made after the backup has started. One each of
these log_type rows is shown in the
logbuffers table for each data node in the
cluster. These rows are not present unless an NDB backup is
currently being performed. (Bug #25822988)