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set @save_query_cache_size=@@query_cache_size;
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;
flush status;
select * from t1;
a
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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
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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 * from performance_schema.setup_timers where name='wait';
NAME TIMER_NAME
wait {CYCLE_OR_NANOSECOND}
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 * from performance_schema.setup_timers where name='wait';
NAME TIMER_NAME
wait {CYCLE_OR_NANOSECOND}
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=@save_query_cache_size;
drop table t1;
flush status;
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