flush status;
show status like "binlog_cache_use";
Variable_name	Value
Binlog_cache_use	0
show status like "binlog_cache_disk_use";
Variable_name	Value
Binlog_cache_disk_use	0
drop table if exists t1;
create table t1 (a int) engine=innodb;
show status like "binlog_cache_use";
Variable_name	Value
Binlog_cache_use	1
show status like "binlog_cache_disk_use";
Variable_name	Value
Binlog_cache_disk_use	1
begin;
delete from t1;
commit;
show status like "binlog_cache_use";
Variable_name	Value
Binlog_cache_use	2
show status like "binlog_cache_disk_use";
Variable_name	Value
Binlog_cache_disk_use	1
drop table t1;