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select * from performance_schema.cond_instances limit 1;
select * from performance_schema.cond_instances
where name='FOO';
insert into performance_schema.cond_instances
set name='FOO', object_instance_begin=12;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
update performance_schema.cond_instances
set name='FOO';
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
delete from performance_schema.cond_instances
where name like "wait/%";
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
delete from performance_schema.cond_instances;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
LOCK TABLES performance_schema.cond_instances READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
UNLOCK TABLES;
LOCK TABLES performance_schema.cond_instances WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`cond_instances`
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='cond_instances';
column_name column_comment
NAME Client user name for the connection, or NULL if an internal thread.
OBJECT_INSTANCE_BEGIN Address in memory of the instrumented condition.
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