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set @@session.max_heap_table_size=16*1024*1024;
create table t1 select * from information_schema.session_status where variable_name like 'Opened%';
create temporary table t2 (a int) engine=memory;
select variable_name, session_status.variable_value - t1.variable_value
from information_schema.session_status join t1 using (variable_name);
variable_name session_status.variable_value - t1.variable_value
OPENED_FILES 0
OPENED_PLUGIN_LIBRARIES 0
OPENED_TABLE_DEFINITIONS 2
OPENED_TABLES 1
OPENED_VIEWS 0
truncate table t2;
select variable_name, session_status.variable_value - t1.variable_value
from information_schema.session_status join t1 using (variable_name);
variable_name session_status.variable_value - t1.variable_value
OPENED_FILES 0
OPENED_PLUGIN_LIBRARIES 0
OPENED_TABLE_DEFINITIONS 2
OPENED_TABLES 1
OPENED_VIEWS 0
drop table t1;
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