vazhdimi i artikullit "
Artikulli do të shqyrtojë dhe do të tregojë në pyetje dhe shembuj specifikë se çfarë informacioni të dobishëm mund të merret duke përdorur historikun e pamjes pg_locks.
Warning.
Për shkak të risisë së temës dhe paplotësimit të periudhës së testimit, artikulli mund të përmbajë gabime. Kritikat dhe komentet janë të mirëseardhura dhe të pritshme.
Fut te dhenat
pg_locks historia e përfaqësimit
mbyllja e arkivit
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
);
Në thelb, tabela është e ngjashme me tabelën archive_pg_stat_activitypërshkruar më në detaje këtu -
Për të mbushur një kolonë pyetësor përdoret funksioni
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;
Shpjegim: vlera e kolonës queryid përditësohet në tabelën history_locking, dhe më pas kur krijohet një ndarje e re për tabelën archive_locking, vlera do të ruhet në vlerat historike.
Produkti
Informacion i përgjithshëm mbi proceset në përgjithësi.
PRITJA E LOCKES SIPAS LOCKTYPES
hetim
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
Shembull
| PRITJA E BLLAKVE SIPAS LOCKTYPEVE +-------------------------------------------- -------+-------------------- | Lloji i bllokimit| mënyra| kohëzgjatja +------------------------------------------------ ------------------ | i transaksionuar| aksionare| 19:39:26 | dyfish| AccessExclusiveLock| 00:03:35 +--------------------------------------------- -------+---------------------
MARRJET E BLVËVE SIPAS LOCKTYPEVE
hetim
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
Shembull
| MARRJA E BLVËVE SIPAS LOCKTYPEVE +-------------------------------------------- -------+-------------------- | Lloji i bllokimit| mënyra| kohëzgjatja +------------------------------------------------ ------------------ | relacion| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | i transaksionuar| ExclusiveLock| 44:24:53 | relacion| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | relacion| ShareUpdateExclusiveLock| 00:26:41 | objekt| RowExclusiveLock| 00:00:01 | i transaksionuar| aksionare| 00:00:01 | zgjas| ExclusiveLock| 00:00:01 +-------------------------------------------- -------+---------------------
Informacion i detajuar për pyetje specifike të pyetjeve
PRITJA E LOCKES SIPAS LOCKTYPES NGA QUERYID
hetim
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
Shembull
| PRITJA E BLLAKVE SIPAS LOCKTYPEVE NGA QUERYID +----------+------------------------------- ---------------+----------------------------------- -------------------------------------------------- - --------- | pid| Lloji i bllokimit| mënyra| filloi| pyetësor| bllokimi_pids| kohëzgjatja +----------+------------------------------------- ---------+---------------------------------------- -----------+-------------------------------------- --- | 11288| i transaksionuar| aksionare| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| i transaksionuar| aksionare| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| i transaksionuar| aksionare| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| i transaksionuar| aksionare| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| i transaksionuar| aksionare| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| i transaksionuar| aksionare| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| i transaksionuar| aksionare| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| i transaksionuar| aksionare| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| i transaksionuar| aksionare| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| i transaksionuar| aksionare| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| i transaksionuar| aksionare| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10
MARRJA E LOCKËVE SIPAS LOCKTYPEVE NGA QUERYID
hetim
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
Shembull
| MARRJA E BLVËVE SIPAS LOCKTYPEVE SIPAS QUERYID +-------------------------------------------- --------------+------------------------------------ -+--------------------+---------------------- | pid| Lloji i bllokimit| mënyra| filloi| pyetësor| bllokimi_pids| kohëzgjatja +----------+------------------------------------- ---------+---------------------------------------- ---+--------------------+---------------- --- | 11288| relacion| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| i transaksionuar| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| relacion| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| relacion| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| virtualxid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| virtualxid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| i transaksionuar| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| dyfish| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
Përdorimi i historisë së bllokimit kur analizohen incidentet e performancës.
- Një pyetje me queryid=389015618226997618 e ekzekutuar nga një proces me pid=11288 ka pritur për një bllokim që nga 2019-09-17 10:00:00 për 3 minuta.
- Kyçja u mbajt me një proces me pid=11092
- Një proces me pid=11092 duke ekzekutuar një pyetje me queryid=389015618226997618 që nga viti 2019-09-17 10:00:00 mbajti bllokimin për 3 minuta.
Total
Tani, shpresoj, do të fillojë gjëja më interesante dhe e dobishme - mbledhja e statistikave dhe analizimi i rasteve mbi historinë e pritjeve dhe bllokimit.
Në të ardhmen, do të doja të besoja, do të merrni një grup shënimesh (të ngjashme me metalink të Oracle).
Në përgjithësi, është për këtë arsye që metodologjia e përdorur shfaqet sa më shpejt që të jetë e mundur për njohjen e publikut.
Në të ardhmen shumë të afërt do të përpiqem ta vendos projektin në github.
Burimi: www.habr.com