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select * from performance_schema.objects_summary_global_by_type
where object_schema = 'performance_schema' limit 1;
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # # #
select * from performance_schema.objects_summary_global_by_type
where object_schema='FOO';
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
select * from performance_schema.objects_summary_global_by_type
order by count_star limit 1;
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # # #
select * from performance_schema.objects_summary_global_by_type
order by count_star desc limit 1;
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # # #
select * from performance_schema.objects_summary_global_by_type
where object_type = 'TABLE' order by object_schema, object_name limit 1;
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # # #
select * from performance_schema.objects_summary_global_by_type
where object_type = 'TABLE' order by object_schema desc, object_name desc limit 1;
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # # #
insert into performance_schema.objects_summary_global_by_type
set object_type='TABLE', schema_name='FOO', object_name='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 'objects_summary_global_by_type'
update performance_schema.objects_summary_global_by_type
set count_star=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
update performance_schema.objects_summary_global_by_type
set count_star=12 where object_name like "FOO";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
delete from performance_schema.objects_summary_global_by_type
where count_star=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
delete from performance_schema.objects_summary_global_by_type;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
LOCK TABLES performance_schema.objects_summary_global_by_type READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
UNLOCK TABLES;
LOCK TABLES performance_schema.objects_summary_global_by_type WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
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='objects_summary_global_by_type';
column_name column_comment
OBJECT_TYPE Groups records together with OBJECT_SCHEMA and OBJECT_NAME.
OBJECT_SCHEMA Groups records together with OBJECT_TYPE and OBJECT_NAME.
OBJECT_NAME Groups records together with OBJECT_SCHEMA and OBJECT_TYPE.
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.
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