Parhad o'r erthygl "
Bydd yr erthygl yn archwilio ac yn dangos, gan ddefnyddio ymholiadau ac enghreifftiau penodol, pa wybodaeth ddefnyddiol y gellir ei chael gan ddefnyddio hanes y golwg pg_locks.
Rhybudd.
Oherwydd newydd-deb y pwnc a'r cyfnod profi anorffenedig, gall yr erthygl gynnwys gwallau. Croesewir a disgwylir beirniadaeth a sylwadau yn gryf.
Data mewnbwn
Hanes cynrychiolaeth pg_locks
archif_cloi
CREATE TABLE archive_locking
( timepoint timestamp without time zone ,
locktype text ,
relation oid ,
mode text ,
tid xid ,
vtid text ,
pid integer ,
blocking_pids integer[] ,
granted boolean ,
queryid bigint
);
Yn y bΓ΄n, mae'r tabl yn debyg i'r tabl archif_pg_stat_actifedd, a ddisgrifir yn fanylach yma -
I lenwi colofn queryid swyddogaeth yn cael ei ddefnyddio
diweddaru_hanes_cloi_wrth_queryid
--update_history_locking_by_queryid.sql
CREATE OR REPLACE FUNCTION update_history_locking_by_queryid() RETURNS boolean AS $$
DECLARE
result boolean ;
current_minute double precision ;
start_minute integer ;
finish_minute integer ;
start_period timestamp without time zone ;
finish_period timestamp without time zone ;
lock_rec record ;
endpoint_rec record ;
current_hour_diff double precision ;
BEGIN
RAISE NOTICE '***update_history_locking_by_queryid';
result = TRUE ;
current_minute = extract ( minute from now() );
SELECT * FROM endpoint WHERE is_need_monitoring
INTO endpoint_rec ;
current_hour_diff = endpoint_rec.hour_diff ;
IF current_minute < 5
THEN
RAISE NOTICE 'Current time is less than 5 minute.';
start_period = date_trunc('hour',now()) + (current_hour_diff * interval '1 hour');
finish_period = start_period - interval '5 minute' ;
ELSE
finish_minute = extract ( minute from now() ) / 5 ;
start_minute = finish_minute - 1 ;
start_period = date_trunc('hour',now()) + interval '1 minute'*start_minute*5+(current_hour_diff * interval '1 hour');
finish_period = date_trunc('hour',now()) + interval '1 minute'*finish_minute*5+(current_hour_diff * interval '1 hour') ;
END IF ;
RAISE NOTICE 'start_period = %', start_period;
RAISE NOTICE 'finish_period = %', finish_period;
FOR lock_rec IN
WITH act_queryid AS
(
SELECT
pid ,
timepoint ,
query_start AS started ,
MAX(timepoint) OVER (PARTITION BY pid , query_start ) AS finished ,
queryid
FROM
activity_hist.history_pg_stat_activity
WHERE
timepoint BETWEEN start_period and
finish_period
GROUP BY
pid ,
timepoint ,
query_start ,
queryid
),
lock_pids AS
(
SELECT
hl.pid ,
hl.locktype ,
hl.mode ,
hl.timepoint ,
MIN ( timepoint ) OVER (PARTITION BY pid , locktype ,mode ) as started
FROM
activity_hist.history_locking hl
WHERE
hl.timepoint between start_period and
finish_period
GROUP BY
hl.pid ,
hl.locktype ,
hl.mode ,
hl.timepoint
)
SELECT
lp.pid ,
lp.locktype ,
lp.mode ,
lp.timepoint ,
aq.queryid
FROM lock_pids lp LEFT OUTER JOIN act_queryid aq ON ( lp.pid = aq.pid AND lp.started BETWEEN aq.started AND aq.finished )
WHERE aq.queryid IS NOT NULL
GROUP BY
lp.pid ,
lp.locktype ,
lp.mode ,
lp.timepoint ,
aq.queryid
LOOP
UPDATE activity_hist.history_locking SET queryid = lock_rec.queryid
WHERE pid = lock_rec.pid AND locktype = lock_rec.locktype AND mode = lock_rec.mode AND timepoint = lock_rec.timepoint ;
END LOOP;
RETURN result ;
END
$$ LANGUAGE plpgsql;
Esboniad: mae gwerth y golofn queryid yn cael ei ddiweddaru yn y tabl history_locking, ac yna pan fydd rhaniad newydd yn cael ei greu ar gyfer y tabl archive_locking, bydd y gwerth yn cael ei storio yn y gwerthoedd hanesyddol.
Allbwn
Gwybodaeth gyffredinol am brosesau yn gyffredinol.
AROS AM LOCKS GAN LOCKTYPES
Cais
WITH
t AS
(
SELECT
locktype ,
mode ,
count(*) as total
FROM
activity_hist.archive_locking
WHERE
timepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
NOT granted
GROUP BY
locktype ,
mode
)
SELECT
locktype ,
mode ,
total * interval '1 second' as duration
FROM t
ORDER BY 3 DESC
Enghraifft
| AROS AM LOCKS TRWY LOCKTYPES +-----------+------------------------------- ------------------ | teip clo | modd| hyd +------------------+------------------------- --+------------------ | trafodiad| ShareLock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +-----------------+--------------------- ------+---------
CYMRYD LOCKS GAN LOCKTYPES
Cais
WITH
t AS
(
SELECT
locktype ,
mode ,
count(*) as total
FROM
activity_hist.archive_locking
WHERE
timepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
granted
GROUP BY
locktype ,
mode
)
SELECT
locktype ,
mode ,
total * interval '1 second' as duration
FROM t
ORDER BY 3 DESC
Enghraifft
| CYMRYD LOCKS WRTH LOCKTYPES +--------------------+---------------------- -------+------------------ | teip clo | modd| hyd +------------------+------------------------- --+------------------ | perthynas| RowExclusiveLock| 51:11:10 | rhithocsid| Clo Unigryw| 48:10:43 | trafodiad| Clo Unigryw| 44:24:53 | perthynas| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| Clo Unigryw| 01:40:41 | perthynas| ShareUpdateExclusiveLock| 00:26:41 | gwrthrych| RowExclusiveLock| 00:00:01 | trafodiad| ShareLock| 00:00:01 | ymestyn| Clo Unigryw| 00:00:01 +-----------------+--------------------- ------+---------
Gwybodaeth fanwl am geisiadau queryid penodol
AROS AM LOCKS GAN LOCKMATHAU GAN QUERYID
Cais
WITH
lt AS
(
SELECT
pid ,
locktype ,
mode ,
timepoint ,
queryid ,
blocking_pids ,
MIN ( timepoint ) OVER (PARTITION BY pid , locktype ,mode ) as started
FROM
activity_hist.archive_locking
WHERE
timepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND
pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
NOT granted AND
queryid IS NOT NULL
GROUP BY
pid ,
locktype ,
mode ,
timepoint ,
queryid ,
blocking_pids
)
SELECT
lt.pid ,
lt.locktype ,
lt.mode ,
lt.started ,
lt.queryid ,
lt.blocking_pids ,
COUNT(*) * interval '1 second' as duration
FROM lt
GROUP BY
lt.pid ,
lt.locktype ,
lt.mode ,
lt.started ,
lt.queryid ,
lt.blocking_pids
ORDER BY 4
Enghraifft
| AROS AM LOCKS WRTH LOCKTYPES GAN QUERYID +----------+----------+---- -------------- +-------------------------+--- --------------- -+------------------+------------------- pid| teip clo | modd| dechrau| queryid| blocio_pids| hyd +---------+-----------------------+---------- --------+---------------------------+-------- ----------+-------------------+--------------- --- | 11288| trafodiad| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| trafodiad| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| trafodiad| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| trafodiad| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| trafodiad| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| trafodiad| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| trafodiad| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| trafodiad| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| trafodiad| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| trafodiad| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| trafodiad| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10
CYMRYD LOCKS TRWY LOCKMATHAU GAN QUERYID
Cais
WITH
lt AS
(
SELECT
pid ,
locktype ,
mode ,
timepoint ,
queryid ,
blocking_pids ,
MIN ( timepoint ) OVER (PARTITION BY pid , locktype ,mode ) as started
FROM
activity_hist.archive_locking
WHERE
timepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND
pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
granted AND
queryid IS NOT NULL
GROUP BY
pid ,
locktype ,
mode ,
timepoint ,
queryid ,
blocking_pids
)
SELECT
lt.pid ,
lt.locktype ,
lt.mode ,
lt.started ,
lt.queryid ,
lt.blocking_pids ,
COUNT(*) * interval '1 second' as duration
FROM lt
GROUP BY
lt.pid ,
lt.locktype ,
lt.mode ,
lt.started ,
lt.queryid ,
lt.blocking_pids
ORDER BY 4
Enghraifft
| CYMRYD LOCKS WRTH LOCKTYPES GAN QUERYID +----------+----------+----- -------------+ --------------------------+---- ---------------+ ------------------+-------------------- pid| teip clo | modd| dechrau| queryid| blocio_pids| hyd +---------+-----------------------+---------- --------+---------------------------+-------- ----------+-------------------+--------------- --- | 11288| perthynas| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| trafodiad| Clo Unigryw| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| perthynas| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| perthynas| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| rhithocsid| Clo Unigryw| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| rhithocsid| Clo Unigryw| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| trafodiad| Clo Unigryw| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| tuple| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
Defnyddio hanes clo i ddadansoddi digwyddiadau perfformiad.
- Roedd cais gyda queryid=389015618226997618 a gyflawnwyd gan broses gyda pid=11288 yn aros am flocio yn dechrau o 2019-09-17 10:00:00 am 3 munud.
- Daliwyd y clo gan broses gyda pid=11092
- Roedd proses gyda pid=11092 yn gweithredu cais gyda queryid=389015618226997618 yn dechrau o 2019-09-17 10:00:00 yn dal y clo am 3 munud.
Cyfanswm
Nawr, rwy'n gobeithio, bydd y rhan fwyaf diddorol a defnyddiol yn dechrau - casglu ystadegau a dadansoddi achosion ar hanes arosiadau a blociau.
Yn y dyfodol, rydw i eisiau credu, fe gawn ni set o nodiadau (tebyg i metalink Oracle).
Yn gyffredinol, dyma'r rheswm pam fod y fethodoleg a ddefnyddir ar gael i bawb cyn gynted Γ’ phosibl.
Byddaf yn ceisio postio'r prosiect ar github yn y dyfodol agos.
Ffynhonnell: hab.com