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7.10.11 The ndbinfo disk_write_speed_aggregate_node Table

The disk_write_speed_aggregate_node table provides aggregated information per node about the speed of disk writes during LCP, backup, and restore operations.

The following table provides information about the columns in the disk_write_speed_aggregate_node table as implemented in NDB 7.4.3 and later; information about disk_write_speed_aggregate_node in NDB 7.4.2 and earlier can be found later in this section. For each column, the table shows the name, data type, and a brief description. Additional information can be found in the notes following the table.

Table 7.26 Columns of the disk_write_speed_aggregate_node table

Column Name Type Description
node_id integer Node ID of this node
backup_lcp_speed_last_sec integer Number of bytes written to disk by backup and LCP processes in the last second
redo_speed_last_sec integer Number of bytes written to REDO log in the last second
backup_lcp_speed_last_10sec integer Number of bytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds
redo_speed_last_10sec integer Number of bytes written to REDO log per second, averaged over the last 10 seconds
backup_lcp_speed_last_60sec integer Number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds
redo_speed_last_60sec integer Number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

Prior to NDB 7.4.3, columns of this table showed values in kilobytes. In NDB 7.4.3 and later, the columns display all such values in bytes. (Bug #74317, Bug #19795072) The following table provides information about disk_write_speed_aggregate as implemented in NDB 7.4.2 and earlier.

Table 7.27 Columns in the disk_write_speed_aggregate_node table prior to NDB 7.4.3

Column Name Type Description
node_id integer Node ID of this node
backup_lcp_speed_last_sec integer Number of kilobytes written to disk by backup and LCP processes in the last second
redo_speed_last_sec integer Number of kilobytes written to REDO log in the last second
backup_lcp_speed_last_10sec numeric Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds
redo_speed_last_10sec numeric Number of kilobytes written to REDO log per second, averaged over the last 10 seconds
backup_lcp_speed_last_60sec numeric Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds
redo_speed_last_60sec numeric Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

The disk_write_speed_aggregate_node table was added in NDB 7.4.1.