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MySQL NDB Cluster 7.5
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7.10.23 The ndbinfo logbuffers Table

The logbuffer table provides information on NDB Cluster log buffer usage.

The following table provides information about the columns in the logbuffers table. For each column, the table shows the name, data type, and a brief description.

Table 7.37 Columns in the logbuffers table

Column Name Type Description
node_id integer The ID of this data node.
log_type string Type of log. Prior to NDB 7.6.6, one of: REDO or DD-UNDO. In NDB 7.6.6 or later, one of: REDO, DD-UNDO, BACKUP-DATA, or BACKUP-LOG.
log_id integer The log ID.
log_part integer The log part number.
total integer Total space available for this log.
used integer Space used by this log.

Beginning with NDB 7.6.6, 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)


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