drop table if exists t1;
create table t1 (a int not null);
insert into t1 values (1), (2), (3);
SET GLOBAL query_cache_size=1355776;
flush query cache;
reset query cache;
select * from t1;
a
1
2
3
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	1
show status like "Qcache_inserts";
Variable_name	Value
Qcache_inserts	1
show status like "Qcache_hits";
Variable_name	Value
Qcache_hits	0
select * from t1;
a
1
2
3
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	1
show status like "Qcache_inserts";
Variable_name	Value
Qcache_inserts	1
show status like "Qcache_hits";
Variable_name	Value
Qcache_hits	1
select spins from performance_schema.EVENTS_WAITS_CURRENT order by event_name limit 1;
spins
NULL
select name from performance_schema.SETUP_INSTRUMENTS order by name limit 1;
name
wait/io/file/csv/data
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	1
show status like "Qcache_inserts";
Variable_name	Value
Qcache_inserts	1
show status like "Qcache_hits";
Variable_name	Value
Qcache_hits	1
select spins from performance_schema.EVENTS_WAITS_CURRENT order by event_name limit 1;
spins
NULL
select name from performance_schema.SETUP_INSTRUMENTS order by name limit 1;
name
wait/io/file/csv/data
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	1
show status like "Qcache_inserts";
Variable_name	Value
Qcache_inserts	1
show status like "Qcache_hits";
Variable_name	Value
Qcache_hits	1
SET GLOBAL query_cache_size= default;
drop table t1;