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select * from performance_schema.socket_summary_by_instance
limit 1;
select * from performance_schema.socket_summary_by_instance
where object_instance_begin='FOO';
insert into performance_schema.socket_summary_by_instance
set object_instance_begin=1,
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 'socket_summary_by_instance'
update performance_schema.socket_summary_by_instance
set count_star=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
update performance_schema.socket_summary_by_instance
set count_star=12 where object_instance_begin like "FOO";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
delete from performance_schema.socket_summary_by_instance
where count_star=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
delete from performance_schema.socket_summary_by_instance;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
LOCK TABLES performance_schema.socket_summary_by_instance READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
UNLOCK TABLES;
LOCK TABLES performance_schema.socket_summary_by_instance WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'socket_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='socket_summary_by_instance';
column_name column_comment
EVENT_NAME Socket instrument.
OBJECT_INSTANCE_BEGIN Address in memory.
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 RECV, RECVFROM, and RECVMSG.
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 SEND, SENDTO, and SENDMSG.
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 CONNECT, LISTEN, ACCEPT, CLOSE, and SHUTDOWN.
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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