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21.5.10.18 The ndbinfo disk_write_speed_aggregate Table

The disk_write_speed_aggregate table provides aggregated information 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 table. 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 21.378 Columns in the disk_write_speed_aggregate table

Column Name Type Description
node_id integer Node ID of this node
thr_no integer Thread ID of this LDM thread
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
std_dev_backup_lcp_speed_last_10sec integer Standard deviation in number of bytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds
std_dev_redo_speed_last_10sec integer Standard deviation in 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 REDO log per second, averaged over the last 10 seconds
std_dev_backup_lcp_speed_last_60sec integer Standard deviation in number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds
std_dev_redo_speed_last_60sec integer Standard deviation in number of bytes written to REDO log per second, averaged over the last 60 seconds
slowdowns_due_to_io_lag integer Number of seconds since last node start that disk writes were slowed due to REDO log I/O lag
slowdowns_due_to_high_cpu integer Number of seconds since last node start that disk writes were slowed due to high CPU usage
disk_write_speed_set_to_min integer Number of seconds since last node start that disk write speed was set to minimum
current_target_disk_write_speed integer Actual speed of disk writes per LDM thread (aggregated)


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