MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
These views summarize table statistics. By default, rows are sorted by descending total wait time (tables with most contention first).
These views user a helper view,
x$ps_schema_table_statistics_io.
The schema_table_statistics and
x$schema_table_statistics views
have these columns:
table_schema
The schema that contains the table.
table_name
The table name.
total_latency
The total wait time of timed I/O events for the table.
rows_fetched
The total number of rows read from the table.
fetch_latency
The total wait time of timed read I/O events for the table.
rows_inserted
The total number of rows inserted into the table.
insert_latency
The total wait time of timed insert I/O events for the table.
rows_updated
The total number of rows updated in the table.
update_latency
The total wait time of timed update I/O events for the table.
rows_deleted
The total number of rows deleted from the table.
delete_latency
The total wait time of timed delete I/O events for the table.
io_read_requests
The total number of read requests for the table.
io_read
The total number of bytes read from the table.
io_read_latency
The total wait time of reads from the table.
io_write_requests
The total number of write requests for the table.
io_write
The total number of bytes written to the table.
io_write_latency
The total wait time of writes to the table.
io_misc_requests
The total number of miscellaneous I/O requests for the table.
io_misc_latency
The total wait time of miscellaneous I/O requests for the table.