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select * from performance_schema.table_io_waits_summary_by_table
limit 1;
select * from performance_schema.table_io_waits_summary_by_table
where object_name='FOO';
insert into performance_schema.table_io_waits_summary_by_table
set object_type='TABLE', object_name='FOO', object_schema='BAR',
count_star=1, sum_timer_wait=2, min_timer_wait=3,
avg_timer_wait=4, max_timer_wait=5;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
update performance_schema.table_io_waits_summary_by_table
set count_star=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
update performance_schema.table_io_waits_summary_by_table
set count_star=12 where object_name like "FOO";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
delete from performance_schema.table_io_waits_summary_by_table
where count_star=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
delete from performance_schema.table_io_waits_summary_by_table;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
LOCK TABLES performance_schema.table_io_waits_summary_by_table READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
UNLOCK TABLES;
LOCK TABLES performance_schema.table_io_waits_summary_by_table WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`table_io_waits_summary_by_table`
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_schema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='table_io_waits_summary_by_table';
column_name column_comment
OBJECT_TYPE Since this table records waits by table, always set to TABLE.
OBJECT_SCHEMA Schema name.
OBJECT_NAME Table name.
COUNT_STAR Number of summarized events and the sum of the x_READ and x_WRITE columns.
SUM_TIMER_WAIT Total wait time of the summarized events that are timed.
MIN_TIMER_WAIT Minimum wait time of the summarized events that are timed.
AVG_TIMER_WAIT Average wait time of the summarized events that are timed.
MAX_TIMER_WAIT Maximum wait time of the summarized events that are timed.
COUNT_READ Number of all read operations, and the sum of the equivalent x_FETCH columns.
SUM_TIMER_READ Total wait time of all read operations that are timed.
MIN_TIMER_READ Minimum wait time of all read operations that are timed.
AVG_TIMER_READ Average wait time of all read operations that are timed.
MAX_TIMER_READ Maximum wait time of all read operations that are timed.
COUNT_WRITE Number of all write operations, and the sum of the equivalent x_INSERT, x_UPDATE and x_DELETE columns.
SUM_TIMER_WRITE Total wait time of all write operations that are timed.
MIN_TIMER_WRITE Minimum wait time of all write operations that are timed.
AVG_TIMER_WRITE Average wait time of all write operations that are timed.
MAX_TIMER_WRITE Maximum wait time of all write operations that are timed.
COUNT_FETCH Number of all fetch operations.
SUM_TIMER_FETCH Total wait time of all fetch operations that are timed.
MIN_TIMER_FETCH Minimum wait time of all fetch operations that are timed.
AVG_TIMER_FETCH Average wait time of all fetch operations that are timed.
MAX_TIMER_FETCH Maximum wait time of all fetch operations that are timed.
COUNT_INSERT Number of all insert operations.
SUM_TIMER_INSERT Total wait time of all insert operations that are timed.
MIN_TIMER_INSERT Minimum wait time of all insert operations that are timed.
AVG_TIMER_INSERT Average wait time of all insert operations that are timed.
MAX_TIMER_INSERT Maximum wait time of all insert operations that are timed.
COUNT_UPDATE Number of all update operations.
SUM_TIMER_UPDATE Total wait time of all update operations that are timed.
MIN_TIMER_UPDATE Minimum wait time of all update operations that are timed.
AVG_TIMER_UPDATE Average wait time of all update operations that are timed.
MAX_TIMER_UPDATE Maximum wait time of all update operations that are timed.
COUNT_DELETE Number of all delete operations.
SUM_TIMER_DELETE Total wait time of all delete operations that are timed.
MIN_TIMER_DELETE Minimum wait time of all delete operations that are timed.
AVG_TIMER_DELETE Average wait time of all delete operations that are timed.
MAX_TIMER_DELETE Maximum wait time of all delete operations that are timed.
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