Макаланын уландысы "
Макалада pg_locks көрүнүшүнүн тарыхын колдонуу менен кандай пайдалуу маалыматтарды алууга болорун конкреттүү суроо жана мисалдар менен карап чыгат жана көрсөтөт.
Эскертүү.
Теманын жаңылыгына жана бүтпөгөн тестирлөө мезгилине байланыштуу макалада каталар болушу мүмкүн. Сын жана сын-пикир катуу кабыл алынат жана күтүлөт.
Маалыматтарды киргизүү
pg_locks өкүлчүлүгүнүн тарыхы
archive_locking
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
);
Негизи, стол үстөлгө окшош archive_pg_stat_activity, бул жерде кененирээк сүрөттөлгөн -
Колонканы толтуруу үчүн queryid функциясы колдонулат
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;
Explanation: queryid тилкесинин мааниси history_locking таблицасында жаңыртылып, андан кийин archive_locking таблицасы үчүн жаңы бөлүм түзүлгөндө, маани тарыхый баалуулуктарда сакталат.
продукция
Процесстер боюнча жалпы маалымат.
БҮЛҮП ТАЙПТАР БОЮНЧА БУЛКУЛАРДЫ КҮТҮҮ
справка
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
мисал
| БҮЛҮП ТАЙПТАР МЕНЕН БҮЛПӨЛӨРДҮ КҮТҮҮ +-----------+----------------------- --------+ ------------------- | locktype| режим| узактыгы +---------------------------------+-------------------------- - --+-------------------- | transferid| ShareLock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +-------------------+--------------------------------- - -------+----------
БҮЛҮПТӨРДҮ БҮЛҮП АЛУУ
справка
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
мисал
| БҮЛПӨЛӨР МЕНЕН АЛУУ +--------------------+----------------------- --------+------------------- | locktype| режим| узактыгы +---------------------------------+-------------------------- - --+-------------------- | мамилеси| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | transferid| ExclusiveLock| 44:24:53 | мамилеси| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | мамилеси| ShareUpdateExclusiveLock| 00:26:41 | объект| RowExclusiveLock| 00:00:01 | transferid| ShareLock| 00:00:01 | узартуу| ExclusiveLock| 00:00:01 +------------------+----------------------- - -------+----------
Атайын queryid сурамдары боюнча толук маалымат
QUERYID МЕНЕН БҮЛҮП ТАЙПТАР МЕНЕН БҮЛПӨЛӨРДҮ КҮТҮҮ
справка
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
мисал
| QUERYID МЕНЕН БҮЛҮП ТАЙПТАР МЕНЕН БҮЛПӨЛӨРДҮ КҮТҮҮ +----------+----------+----- --------------- +--------------------------------+-------------------- -+--------------------+----------- --------- | pid| locktype| режим| баштады| queryid| blocking_pids| узактыгы +----------+-------------------------+----------- ---------+------------------------------+--------- --------------------+--------------------+----------------- --- | 11288| transferid| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| transferid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| transferid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| transferid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| transferid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| transferid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| transferid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| transferid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| transferid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| transferid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| transferid| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10
QUERYID МЕНЕН БҮЛҮПТӨР МЕНЕН БӨЛПӨНҮҮ
справка
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
мисал
| QUERYID МЕНЕН БҮЛПӨЛӨГӨН ТАЙПТАР МЕНЕН БУЛПОНДУ АЛУУ +----------+----------+------ --------------+ ---------------------------------+--------------------+ -------------------+------------ -------- | pid| locktype| режим| баштады| queryid| blocking_pids| узактыгы +----------+-------------------------+----------- ---------+------------------------------+--------- --------------------+--------------------+----------------- --- | 11288| мамилеси| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| transferid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| мамилеси| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| мамилеси| 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| transferid| ExclusiveLock| 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
Иштөө инциденттерин талдоо үчүн кулпу таржымалын колдонуу.
- pid=389015618226997618 процесси менен аткарылган queryid=11288 сурам 2019-09-17 саат 10:00:00 баштап 3 мүнөт бою бөгөттөөнү күтүп жаткан.
- Кулпу pid=11092 процесси менен өткөрүлдү
- 11092-389015618226997618-2019 саат 09:17:10дөн баштап queryid=00 менен сурамды аткарган pid=00 процесси кулпуну 3 мүнөткө кармап турду.
жыйынтык
Эми, эң кызыктуу жана пайдалуу бөлүгү башталат деп үмүттөнөм - статистиканы чогултуу жана күтүү жана бөгөт коюу тарыхы боюнча иштерди талдоо.
Келечекте, мен ишенгим келет, биз кээ бир ноталардын топтомун алабыз (Oracle's metalink сыяктуу).
Жалпысынан алганда, ушул себептен улам, колдонулган методология мүмкүн болушунча тезирээк бардыгына жеткиликтүү болот.
Мен жакынкы келечекте долбоорду github сайтына жайгаштырууга аракет кылам.
Source: www.habr.com