MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The diskstats_1sec table provides information
about writes to Disk Data tablespaces over the past 20 seconds.
The diskstat table contains the following
columns:
node_id
Node ID of this node
block_instance
ID of reporting instance of
PGMAN
pages_made_dirty
Pages made dirty during the designated 1-second interval
reads_issued
Reads issued during the designated 1-second interval
reads_completed
Reads completed during the designated 1-second interval
writes_issued
Writes issued during the designated 1-second interval
writes_completed
Writes completed during the designated 1-second interval
log_writes_issued
Number of times a page write has required a log write during the designated 1-second interval
log_writes_completed
Number of log writes completed during the designated 1-second interval
get_page_calls_issued
Number of get_page() calls issued during
the designated 1-second interval
get_page_reqs_issued
Number of times that a get_page() call
has resulted in a wait for I/O or completion of I/O already
begun during the designated 1-second interval
get_page_reqs_completed
Number of get_page() calls waiting for
I/O or I/O completion that have completed during the
designated 1-second interval
seconds_ago
Number of 1-second intervals in the past of the interval to which this row applies
Each row in this table corresponds to an instance of
PGMAN during a 1-second
interval occurring from 0 to 19 seconds ago; there is one such
instance per LDM thread plus an additional instance for each
data node.