Framhald greinarinnar “
Greinin mun skoða og sýna, með því að nota sérstakar fyrirspurnir og dæmi, hvaða gagnlegar upplýsingar er hægt að fá með því að nota sögu pg_locks útsýnisins.
Viðvörun
Vegna nýjungarinnar í efninu og ólokið prófunartímabils getur greinin innihaldið villur. Gagnrýni og athugasemdir eru mjög vel þegnar og búist við.
Inntaksgögn
Saga pg_locks framsetningar
skjalasafnslæsing
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
);
Í meginatriðum er borðið svipað og borðið archive_pg_stat_activity, nánar lýst hér -
Til að fylla dálk queryid aðgerð er notuð
update_history_locking_by_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;
Útskýring: gildi queryid dálksins er uppfært í history_locking töflunni og síðan þegar ný skipting er búin til fyrir archive_locking töfluna verður gildið geymt í sögulegu gildunum.
Framleiðsla
Almennar upplýsingar um ferla almennt.
BÍÐA EFTIR LÁSUM MEÐ LÁSTYPUM
Beiðni
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
Dæmi
| BÍÐA EFTIR LÁSUM MEÐ LÁSTYPUM +------+------------------------------------------+ ------------------ | locktype| háttur| lengd +---------------------+-------------------------------- - --+---------------------------- | viðskiptanúmer| ShareLock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +--------------------+-------------------------------- - -------+----------
TÖKUN LÁSUM MEÐ LÁSTYPUM
Beiðni
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
Dæmi
| LÁSATEKNINGAR MEÐ LÁSTYPUM +-------------------------+------------------------------ ----+------------------------- | locktype| háttur| lengd +---------------------+-------------------------------- - --+---------------------------- | samband| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | viðskiptanúmer| ExclusiveLock| 44:24:53 | samband| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | samband| ShareUpdateExclusiveLock| 00:26:41 | mótmæla| RowExclusiveLock| 00:00:01 | viðskiptanúmer| ShareLock| 00:00:01 | lengja | ExclusiveLock| 00:00:01 +------------------------+----------------------------- - -------+----------
Ítarlegar upplýsingar um sérstakar beiðnir um queryid
BÍÐUR EFTIR LÁSINGUM EFTIR LOCKTYPES EFTIR QUERYID
Beiðni
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
Dæmi
| BÍÐA EFTIR LÁSINGUM MEÐ LOCKTYPES BY QUERYID +------------------------------------------- +--------------------------------+--- ------------------ --+--------------------+---------------- ---------- | pid| locktype| háttur| byrjaði| queryid| blocking_pids| lengd +------------------------ ---------------------------------------------+--------- ------------------------------+ --- | 11288| viðskiptanúmer| ShareLock| 2019 09:17:10| 00| {00.302936}| 389015618226997618:11092:00 | 03| viðskiptanúmer| ShareLock| 34 11626:2019:09| 17| {10}| 00:21.380921:389015618226997618 | 12380| viðskiptanúmer| ShareLock| 00 00:29:11626| 2019| {09}| 17:10:00 | 21.380921| viðskiptanúmer| ShareLock| 389015618226997618 11092:00:03| 25| {11626}| 2019:09:17 | 10| viðskiptanúmer| ShareLock| 00 21.380921:389015618226997618:12213| 00| {01}| 55:11626:2019 | 09| viðskiptanúmer| ShareLock| 17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| viðskiptanúmer| ShareLock| 2019 09:17:10| 00| {24.331935}| 389015618226997618:11092:00 | 03| viðskiptanúmer| ShareLock| 22 11629:2019:09| 17| {10}| 00:24.331935:389015618226997618 | 12007| viðskiptanúmer| ShareLock| 00 00:01:12007| 2019| {09}| 17:10:05 | 03.327933| viðskiptanúmer| ShareLock| 389015618226997618 11629:00:00| 13| {12007}| 2019:09:17 | 10| viðskiptanúmer| ShareLock| 05 03.327933:389015618226997618:11092| 00| {01}| 10:12007:2019
AÐ TAKA LÁSA MEÐ LOCKTYPES MEÐ QUERYID
Beiðni
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
Dæmi
| LÁSINGAR MEÐ LOCKTYPES MEÐ QUERYID +----------------------------------+ ----------------------------+--------------------+ --------------------+---------------------------- | pid| locktype| háttur| byrjaði| queryid| blocking_pids| lengd +------------------------ ---------------------------------------------+--------- ------------------------------+ --- | 11288| samband| RowExclusiveLock| 2019 09:17:10| 00| {00.302936}| 389015618226997618:11092:00 | 03| viðskiptanúmer| ExclusiveLock| 34 11092:2019:09| 17| {}| 10:00:00.302936 | 389015618226997618| samband| RowExclusiveLock| 00 03:34:11288| 2019| {}| 09:17:10 | 00| samband| RowExclusiveLock| 00.302936 389015618226997618:00:00| 10| {}| 11092:2019:09 | 17| virtualxid| ExclusiveLock| 10 00:00.302936:389015618226997618| 00| {}| 03:34:11092 | 2019| virtualxid| ExclusiveLock| 09 17:10:00| 00.302936| {389015618226997618}| 00:03:34 | 11288| viðskiptanúmer| ExclusiveLock| 2019 09:17:10| 00| {00.302936}| 389015618226997618:11092:00 | 03| tuple| AccessExclusiveLock| 34 11288:2019:09| 17| {10}| 00:00.302936:389015618226997618
Notkun læsingasögu til að greina frammistöðuatvik.
- Beiðni með queryid=389015618226997618 framkvæmd með ferli með pid=11288 beið eftir lokun frá og með 2019-09-17 10:00:00 í 3 mínútur.
- Læsingunni var haldið með ferli með pid=11092
- Ferli þar sem pid=11092 framkvæmir beiðni með queryid=389015618226997618 frá og með 2019-09-17 10:00:00 hélt læsingunni í 3 mínútur.
Samtals
Nú, vona ég, byrjar áhugaverðasti og gagnlegasti hlutinn - að safna tölfræði og greina tilvik um sögu bið og lokunar.
Í framtíðinni, ég vil trúa, munum við fá sett af nokkrum athugasemdum (svipað og Oracle's metallink).
Almennt séð er það af þessum sökum sem aðferðafræðin sem notuð er er gerð aðgengileg öllum eins fljótt og auðið er.
Ég mun reyna að birta verkefnið á github á næstunni.
Heimild: www.habr.com