set @save_query_cache_size=@@query_cache_size;
set GLOBAL query_cache_size=1355776;
set GLOBAL query_cache_type=ON;
set LOCAL query_cache_type=ON;
drop database if exists MySQLtesT;
create database MySQLtesT;
create table MySQLtesT.t1 (a int);
select * from MySQLtesT.t1;
a
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	1
drop database mysqltest;
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	0
use MySQL;
select * from db;
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	0
use test;
select * from MySQL.db;
show status like "Qcache_queries_in_cache";
Variable_name	Value
Qcache_queries_in_cache	0
set GLOBAL query_cache_size=@save_query_cache_size;
set GLOBAL query_cache_type=default;