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select * from performance_schema.file_summary_by_instance
where event_name like 'Wait/io/%' limit 1;
select * from performance_schema.file_summary_by_instance
where event_name='FOO';
insert into performance_schema.file_summary_by_instance
set event_name='FOO', count_read=1, count_write=2,
sum_number_of_bytes_read=4, sum_number_of_bytes_write=5;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
update performance_schema.file_summary_by_instance
set count_read=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
update performance_schema.file_summary_by_instance
set count_write=12 where event_name like "FOO";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
delete from performance_schema.file_summary_by_instance
where count_read=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
delete from performance_schema.file_summary_by_instance;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
LOCK TABLES performance_schema.file_summary_by_instance READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
UNLOCK TABLES;
LOCK TABLES performance_schema.file_summary_by_instance WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`file_summary_by_instance`
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='file_summary_by_instance';
column_name column_comment
FILE_NAME File name.
EVENT_NAME Event name.
OBJECT_INSTANCE_BEGIN Address in memory. Together with FILE_NAME and EVENT_NAME uniquely identifies a row.
COUNT_STAR Number of summarized events
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, including FGETS, FGETC, FREAD, and READ.
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.
SUM_NUMBER_OF_BYTES_READ Bytes read by read operations.
COUNT_WRITE Number of all write operations, including FPUTS, FPUTC, FPRINTF, VFPRINTF, FWRITE, and PWRITE.
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.
SUM_NUMBER_OF_BYTES_WRITE Bytes written by write operations.
COUNT_MISC Number of all miscellaneous operations not counted above, including CREATE, DELETE, OPEN, CLOSE, STREAM_OPEN, STREAM_CLOSE, SEEK, TELL, FLUSH, STAT, FSTAT, CHSIZE, RENAME, and SYNC.
SUM_TIMER_MISC Total wait time of all miscellaneous operations that are timed.
MIN_TIMER_MISC Minimum wait time of all miscellaneous operations that are timed.
AVG_TIMER_MISC Average wait time of all miscellaneous operations that are timed.
MAX_TIMER_MISC Maximum wait time of all miscellaneous operations that are timed.
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