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--source include/not_embedded.inc
--source include/have_perfschema.inc
# This test needs a fresh restart. The table performance_schema.table_handles
# can otherwise contain extra rows left from previous testcases.
# For example the test case main.long_unique_delayed, which uses
# INSERT DELAYED, will leave extra rows in this table if run just before this
# test, causing .result diff failure.
--source include/restart_mysqld.inc
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
WHERE name in ('wait/io/table/sql/handler',
'wait/lock/table/sql/handler',
'wait/lock/metadata/sql/mdl');
set @orig_sql_mode= @@sql_mode;
set sql_mode= (select replace(@@sql_mode,'NO_AUTO_CREATE_USER',''));
grant ALL on *.* to user1@localhost;
grant ALL on *.* to user2@localhost;
set sql_mode= @orig_sql_mode;
insert into performance_schema.setup_objects (object_type, object_schema, object_name, enabled, timed)
values ('TABLE', 'mtr', '%', 'NO', 'NO');
--echo # Switch to (con1, localhost, user1, , )
connect (con1, localhost, user1, , );
let $user1_tid=`select THREAD_ID from performance_schema.threads where PROCESSLIST_ID=connection_id()`;
--echo # Switch to (con2, localhost, user2, , )
connect (con2, localhost, user2, , );
let $user2_tid=`select THREAD_ID from performance_schema.threads where PROCESSLIST_ID=connection_id()`;
--connection default
--disable_query_log
--eval set @user1_tid= $user1_tid;
--eval set @user2_tid= $user2_tid;
--enable_query_log
--disable_warnings
drop function if exists thread_id_name;
--enable_warnings
--delimiter //
create function thread_id_name(THREAD_ID int)
returns varchar(16)
begin
if (THREAD_ID IS NULL)
then
return NULL;
end if;
if (THREAD_ID = @user1_tid)
then
return "USER1";
end if;
if (THREAD_ID = @user2_tid)
then
return "USER2";
end if;
return "OTHER";
end;
//
delimiter ;//
select thread_id_name(NULL);
select thread_id_name(@user1_tid);
select thread_id_name(@user2_tid);
prepare dump_metadata_locks from
"select OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME,
LOCK_TYPE, LOCK_DURATION, LOCK_STATUS,
thread_id_name(OWNER_THREAD_ID) as OWNER_THREAD_ID
from performance_schema.metadata_locks
order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME,
LOCK_TYPE, LOCK_DURATION, LOCK_STATUS, OWNER_THREAD_ID;";
prepare dump_table_handles from
"select OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME,
INTERNAL_LOCK, EXTERNAL_LOCK,
thread_id_name(OWNER_THREAD_ID) as OWNER_THREAD_ID
from performance_schema.table_handles
order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME,
INTERNAL_LOCK, EXTERNAL_LOCK, OWNER_THREAD_ID;";
prepare dump_waits_current from
"select thread_id_name(THREAD_ID) as THREAD_ID,
EVENT_NAME,
TIMER_START is not NULL as TIMER_START_SET,
TIMER_END is not NULL as TIMER_END_SET,
OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME,
OPERATION
from performance_schema.events_waits_current
where event_name = \'wait/lock/metadata/sql/mdl\';";
prepare dump_waits_history_long from
"select thread_id_name(THREAD_ID) as THREAD_ID,
EVENT_NAME,
TIMER_START is not NULL as TIMER_START_SET,
TIMER_END is not NULL as TIMER_END_SET,
OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME,
OPERATION
from performance_schema.events_waits_history_long
where event_name = \'wait/lock/metadata/sql/mdl\';";
# reset lost counters
truncate table performance_schema.events_statements_summary_by_digest;
flush global status;
flush tables;
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (id INT PRIMARY KEY, b CHAR(100) DEFAULT 'initial value');
INSERT INTO t1 (id) VALUES (1), (2), (3), (4), (5), (6), (7), (8);
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
--connection con1
BEGIN;
# MDL lock granted immediately, no wait.
SELECT * from t1 where id=1;
--connection default
echo "---- Marker 1 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
# The MDL lock is now released
COMMIT;
--connection default
echo "---- Marker 2 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
BEGIN;
# MDL lock is granted immediately, no wait
UPDATE t1 set b="new value" where id=2;
--connection default
echo "---- Marker 3 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con2
BEGIN;
# MDL lock is PENDING : waiting for the update transaction
--send DROP TABLE t1;
--connection default
# Wait for the DROP TABLE t1 to block
let $wait_condition=
select count(*) = 1 from performance_schema.events_waits_current
where event_name = 'wait/lock/metadata/sql/mdl'
and object_name = 't1';
--source include/wait_condition.inc
echo "---- Marker 4 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
# MDL lock on the update is released,
# MDL pending lock is granted for the drop table, then released.
COMMIT;
--connection con2
# complete DROP TABLE t1
--reap
--connection default
echo "---- Marker 5 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection default
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
create table t1 (a int);
--connection con1
# Get MDL read lock
LOCK TABLE t1 READ;
--connection default
echo "---- Marker 6 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con2
# User1 has a READ LOCK
# User2 waiting for WRITE LOCK
--send LOCK TABLE t1 write;
--connection default
# Wait for the LOCK TABLE t1 write to block
let $wait_condition=
select count(*) = 1 from performance_schema.events_waits_current
where event_name = 'wait/lock/metadata/sql/mdl'
and object_name = 't1';
--source include/wait_condition.inc
echo "---- Marker 7 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
# User1 releases a READ LOCK
# User2 granted a WRITE LOCK
UNLOCK TABLES;
--connection con2
# Complete LOCK TABLE t1 write
--reap
--connection default
echo "---- Marker 8 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
# User2 granted a WRITE LOCK
# User1 waits for a READ LOCK
--send LOCK TABLES t1 read;
--connection default
# Wait for the LOCK TABLES t1 READ to block
let $wait_condition=
select count(*) = 1 from performance_schema.events_waits_current
where event_name = 'wait/lock/metadata/sql/mdl'
and object_name = 't1';
--source include/wait_condition.inc
echo "---- Marker 9 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con2
UNLOCK TABLES;
--connection con1
# Complete LOCK TABLE t1 read
--reap
--connection default
echo "---- Marker 10 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
UNLOCK TABLES;
--connection default
echo "---- Marker 11 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
--connection con1
BEGIN;
# MDL lock is granted immediately, no wait
UPDATE LOW_PRIORITY t1 SET a=8;
--connection default
echo "---- Marker 12 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
COMMIT;
--connection default
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
--connection con1
--disable_ps2_protocol
SELECT GET_LOCK('test', 0);
--enable_ps2_protocol
--connection default
echo "---- Marker 13 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con2
--disable_ps2_protocol
--send SELECT GET_LOCK('test', 120);
--enable_ps2_protocol
--connection default
let $wait_condition=
select count(*) = 1 from performance_schema.events_waits_current
where event_name = 'wait/lock/metadata/sql/mdl'
and object_name = 'test';
--source include/wait_condition.inc
echo "---- Marker 14 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con1
--disable_ps2_protocol
SELECT RELEASE_LOCK('test');
--enable_ps2_protocol
--connection con2
--reap
--connection default
echo "---- Marker 15 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
--connection con2
--disable_ps2_protocol
SELECT RELEASE_LOCK('test');
--enable_ps2_protocol
--connection default
echo "---- Marker 16 ----";
--vertical_results
execute dump_metadata_locks;
execute dump_table_handles;
execute dump_waits_current;
execute dump_waits_history_long;
--horizontal_results
# Cleanup
--disconnect con1
--disconnect con2
--connection default
drop table t1;
UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
revoke all privileges, grant option from user1@localhost;
revoke all privileges, grant option from user2@localhost;
drop user user1@localhost;
drop user user2@localhost;
drop function thread_id_name;
drop prepare dump_metadata_locks;
drop prepare dump_table_handles;
drop prepare dump_waits_current;
drop prepare dump_waits_history_long;
delete from performance_schema.setup_objects
where object_schema='mtr';
# In case of failure, will indicate the root cause
show global status like "performance_schema%";
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