mirror of
https://github.com/MariaDB/server.git
synced 2025-11-30 05:23:50 +03:00
b01d8e1a33
For now, we will acquire the lock_sys.latch only in exclusive mode, that is, use it as a mutex. This is preparation for the next commit where we will introduce a less intrusive alternative, combining a shared lock_sys.latch with dict_table_t::lock_mutex or a mutex embedded in lock_sys.rec_hash, lock_sys.prdt_hash, or lock_sys.prdt_page_hash.
55 lines
2.3 KiB
Plaintext
55 lines
2.3 KiB
Plaintext
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
|
|
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
|
|
WHERE name like 'wait/synch/sxlock/%';
|
|
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
|
|
WHERE name like 'wait/synch/rwlock/innodb/%';
|
|
SELECT DISTINCT name FROM performance_schema.setup_instruments
|
|
WHERE name LIKE 'wait/synch/rwlock/innodb/%'
|
|
AND name!='wait/synch/rwlock/innodb/btr_search_latch' ORDER BY name;
|
|
name
|
|
wait/synch/rwlock/innodb/dict_operation_lock
|
|
wait/synch/rwlock/innodb/fil_space_latch
|
|
wait/synch/rwlock/innodb/lock_latch
|
|
wait/synch/rwlock/innodb/trx_i_s_cache_lock
|
|
wait/synch/rwlock/innodb/trx_purge_latch
|
|
TRUNCATE TABLE performance_schema.events_waits_history_long;
|
|
TRUNCATE TABLE performance_schema.events_waits_history;
|
|
TRUNCATE TABLE performance_schema.events_waits_current;
|
|
select name from performance_schema.setup_instruments
|
|
where name like "wait/synch/sxlock/%" order by name;
|
|
name
|
|
wait/synch/sxlock/innodb/index_tree_rw_lock
|
|
SELECT DISTINCT name FROM performance_schema.rwlock_instances
|
|
WHERE name LIKE 'wait/synch/sxlock/innodb/%'
|
|
ORDER BY name;
|
|
name
|
|
wait/synch/sxlock/innodb/index_tree_rw_lock
|
|
create table t1(a int) engine=innodb;
|
|
begin;
|
|
insert into t1 values (1), (2), (3);
|
|
insert into t1 values (1), (2), (3);
|
|
insert into t1 values (1), (2), (3);
|
|
commit;
|
|
drop table t1;
|
|
SELECT DISTINCT event_name FROM performance_schema.events_waits_history_long
|
|
WHERE event_name LIKE 'wait/synch/rwlock/innodb/%'
|
|
AND event_name NOT IN
|
|
('wait/synch/rwlock/innodb/btr_search_latch',
|
|
'wait/synch/rwlock/innodb/trx_purge_latch')
|
|
ORDER BY event_name;
|
|
event_name
|
|
wait/synch/rwlock/innodb/dict_operation_lock
|
|
wait/synch/rwlock/innodb/fil_space_latch
|
|
wait/synch/rwlock/innodb/lock_latch
|
|
SELECT event_name FROM performance_schema.events_waits_history_long
|
|
WHERE event_name = 'wait/synch/sxlock/innodb/index_tree_rw_lock'
|
|
AND operation IN ('try_shared_lock','shared_lock') LIMIT 1;
|
|
event_name
|
|
wait/synch/sxlock/innodb/index_tree_rw_lock
|
|
SELECT event_name from performance_schema.events_waits_history_long
|
|
WHERE event_name = 'wait/synch/sxlock/innodb/index_tree_rw_lock'
|
|
AND operation IN ('try_exclusive_lock','exclusive_lock') LIMIT 1;
|
|
event_name
|
|
wait/synch/sxlock/innodb/index_tree_rw_lock
|
|
UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
|