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