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flush status;
show status like 'Table_lock%';
Variable_name Value
Table_locks_immediate 0
Table_locks_waited 0
SET SQL_LOG_BIN=0;
drop table if exists t1;
create table t1(n int) type=myisam;
insert into t1 values(1);
lock tables t1 read;
unlock tables;
lock tables t1 read;
update t1 set n = 3;
unlock tables;
show status like 'Table_lock%';
Variable_name Value
Table_locks_immediate 4
Table_locks_waited 1
drop table t1;
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