Node ID of this node 

• thr_no 

Thread ID of this LDM thread 

• millis_ago 

Milliseconds since this reporting period ended 

• millis_passed 

Milliseconds elapsed in this reporting period 

• backup_lcp_bytes_written 

Number of bytes written to disk by local checkpoints and backup processes during this period 

## 23.5.14.25 The ndbinfo disk_write_speed_aggregate Table 

• redo_bytes_written 

Number of bytes written to REDO log during this period 

• target_disk_write_speed 

Actual speed of disk writes per LDM thread (base data) 

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

The disk_write_speed_aggregate  table contains the following columns: 

• node_id 

Node ID of this node 

• thr_no 

Thread ID of this LDM thread 

• backup_lcp_speed_last_sec 

Number of bytes written to disk by backup and LCP processes in the last second 

• redo_speed_last_sec 

Number of bytes written to REDO log in the last second 

• backup_lcp_speed_last_10sec 

Number of bytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds 

• redo_speed_last_10sec 

Number of bytes written to REDO log per second, averaged over the last 10 seconds 

• std_dev_backup_lcp_speed_last_10sec 

