{"id":38232,"date":"2019-10-31T22:22:28","date_gmt":"2019-10-31T19:22:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/odin-iz-metodov-polucheniya-istorii-blokirovok-v-postgresql\/"},"modified":"2019-10-31T22:22:28","modified_gmt":"2019-10-31T19:22:28","slug":"odin-iz-metodov-polucheniya-istorii-blokirovok-v-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/odin-iz-metodov-polucheniya-istorii-blokirovok-v-postgresql","title":{"rendered":"Jedna z metod, jak z\u00edskat historii blokac\u00ed v PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pokra\u010dov\u00e1n\u00ed \u010dl\u00e1nku «Pokra\u010dov\u00e1n\u00ed pokusu o vytvo\u0159en\u00ed ekvivalentu ASH pro PostgreSQL <\/a><\/noindex>«.<\/p>\n

V \u010dl\u00e1nku bude rozebr\u00e1no a uk\u00e1z\u00e1no na konkr\u00e9tn\u00edch dotazech a p\u0159\u00edkladech \u2014 jak\u00e9 u\u017eite\u010dn\u00e9 informace lze z\u00edskat pomoc\u00ed historie zobrazen\u00ed pg_locks.<\/p>\n

Upozorn\u011bn\u00ed.
\nVzhledem k novosti t\u00e9matu a nedokon\u010den\u00ed testovac\u00edho obdob\u00ed m\u016f\u017ee \u010dl\u00e1nek obsahovat chyby. Kritika a p\u0159ipom\u00ednky jsou v\u00edt\u00e1ny a o\u010dek\u00e1v\u00e1ny.<\/p><\/blockquote>\n

<\/a><\/noindex><\/p>\n

Vstupn\u00ed data<\/h2>\n

<\/p>\n

Historie zobrazen\u00ed pg_locks<\/h3>\n

\narchive_locking<\/b><\/p>\n

CREATE TABLE archive_locking \n(       timepoint timestamp without time zone ,\n\tlocktype text ,\n\trelation oid ,\n\tmode text ,\n\ttid xid ,\n\tvtid text ,\n\tpid integer ,\n\tblocking_pids integer[] ,\n\tgranted boolean ,\n        queryid bigint \n);<\/code><\/pre>\n
\nV podstat\u011b je tabulka podobn\u00e1 tabulce archive_pg_stat_activity<\/b>, podrobn\u011bji popsan\u00e9 zde \u2014 pg_stat_statements + pg_stat_activity + loq_query = pg_ash? <\/a><\/noindex> a zde \u2014 Pokra\u010dov\u00e1n\u00ed pokusu o vytvo\u0159en\u00ed ekvivalentu ASH pro PostgreSQL.<\/a><\/noindex><\/p>\n
Pro vypln\u011bn\u00ed sloupce queryid<\/b> se pou\u017e\u00edv\u00e1 funkce <\/p>\n
update_history_locking_by_queryid<\/b><\/p>\n
--update_history_locking_by_queryid.sql\nCREATE OR REPLACE FUNCTION update_history_locking_by_queryid() RETURNS boolean AS $$\nDECLARE\n  result boolean ;\n  current_minute double precision ; \n  \n  start_minute integer ;\n  finish_minute integer ;\n  \n  start_period timestamp without time zone ;\n  finish_period timestamp without time zone ;\n  \n  lock_rec record ; \n  endpoint_rec record ; \n  \n  current_hour_diff double precision ;\nBEGIN\n  RAISE NOTICE '***update_history_locking_by_queryid';\n  \n  result = TRUE ;\n  \n  current_minute = extract ( minute from now() );\n\n  SELECT * FROM endpoint WHERE is_need_monitoring\n  INTO endpoint_rec ;\n  \n  current_hour_diff = endpoint_rec.hour_diff ;\n  \n  IF current_minute < 5 \n  THEN\n\tRAISE NOTICE 'Current time is less than 5 minute.';\n\t\n\tstart_period = date_trunc('hour',now()) + (current_hour_diff * interval '1 hour');\n    finish_period = start_period - interval '5 minute' ;\n  ELSE \n    finish_minute =  extract ( minute from now() ) \/ 5 ;\n    start_minute =  finish_minute - 1 ;\n  \n    start_period = date_trunc('hour',now()) + interval '1 minute'*start_minute*5+(current_hour_diff * interval '1 hour');\n    finish_period = date_trunc('hour',now()) + interval '1 minute'*finish_minute*5+(current_hour_diff * interval '1 hour') ;\n    \n  END IF ;  \n  \n  RAISE NOTICE 'start_period = %', start_period;\n  RAISE NOTICE 'finish_period = %', finish_period;\n\n\tFOR lock_rec IN   \n\tWITH act_queryid AS\n\t (\n\t\tSELECT \n\t\t\t\tpid , \n\t\t\t\ttimepoint ,\n\t\t\t\tquery_start AS started ,\t\t\t\n\t\t\t\tMAX(timepoint) OVER (PARTITION BY pid ,\tquery_start   ) AS finished ,\t\t\t\n\t\t\t\tqueryid \n\t\tFROM \n\t\t\t\tactivity_hist.history_pg_stat_activity \t\t\t\n\t\tWHERE \t\t\t\n\t\t\t\ttimepoint BETWEEN start_period and \n\t\t\t\t\t\t\t\t  finish_period\n\t\tGROUP BY \n\t\t\t\tpid , \n\t\t\t\ttimepoint ,  \n\t\t\t\tquery_start ,\n\t\t\t\tqueryid \n\t ),\n\t lock_pids AS\n\t\t(\n\t\t\tSELECT\n\t\t\t\thl.pid , \n\t\t\t\thl.locktype  ,\n\t\t\t\thl.mode ,\n\t\t\t\thl.timepoint , \n\t\t\t\tMIN ( timepoint ) OVER (PARTITION BY pid , locktype  ,mode ) as started \n\t\t\tFROM \n\t\t\t\tactivity_hist.history_locking hl\n\t\t\tWHERE \n\t\t\t\thl.timepoint between start_period and \n\t\t\t\t\t\t\t\t     finish_period\n\t\t\tGROUP BY \n\t\t\t\thl.pid , \n\t\t\t\thl.locktype  ,\n\t\t\t\thl.mode ,\n\t\t\t\thl.timepoint \n\t\t)\n\tSELECT \n\t\tlp.pid , \n\t\tlp.locktype  ,\n\t\tlp.mode ,\n\t\tlp.timepoint ,     \n\t\taq.queryid \n\tFROM lock_pids \tlp LEFT OUTER JOIN act_queryid aq ON ( lp.pid = aq.pid AND lp.started BETWEEN aq.started AND aq.finished )\n\tWHERE aq.queryid IS NOT NULL \n\tGROUP BY  \n\t\tlp.pid , \n\t\tlp.locktype  ,\n\t\tlp.mode ,\n\t\tlp.timepoint , \n\t\taq.queryid\n\tLOOP\n\t\tUPDATE activity_hist.history_locking SET queryid = lock_rec.queryid \n\t\tWHERE pid = lock_rec.pid AND locktype = lock_rec.locktype AND mode = lock_rec.mode AND timepoint = lock_rec.timepoint ;\t\n\tEND LOOP;    \n  \n  RETURN result ;\nEND\n$$ LANGUAGE plpgsql;<\/code><\/pre>\n
\nVysv\u011btlen\u00ed:<\/b> Hodnota sloupce queryid je aktualizov\u00e1na v tabulce history_locking a pot\u00e9, p\u0159i vytv\u00e1\u0159en\u00ed nov\u00e9 sekce pro tabulku archive_locking, bude hodnota ulo\u017eena v historick\u00fdch hodnot\u00e1ch. <\/p>\n
V\u00fdstupn\u00ed data<\/h2>\n
\nObecn\u00e9 informace o procesech jako celku.<\/p>\n
\u010cEK\u00c1N\u00cd NA ZAMKNUT\u00cd PODLE TYP\u016e ZAMKNUT\u00cd<\/h3>\n
\nDotaz<\/b><\/p>\n
WITH\nt AS\n(\n\tSELECT \n\t\tlocktype  ,\n\t\tmode ,\n\t\tcount(*) as total \n\tFROM \n\t\tactivity_hist.archive_locking\n\tWHERE \n\t\ttimepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND \n\t\tNOT granted\n\tGROUP BY \n\t\tlocktype  ,\n\t\tmode  \n)\nSELECT \n\tlocktype  ,\n\tmode ,\n\ttotal * interval '1 second' as duration\t\t\t\nFROM t \t\t\nORDER BY 3 DESC <\/code><\/pre>\n
\nP\u0159\u00edklad<\/b><\/p>\n
| \u010cEK\u00c1N\u00cd NA Z\u00c1MKY PODLE TYPU Z\u00c1MKU\n+--------------------+------------------------------+--------------------\n|            typ_z\u00e1mku|                          re\u017eim|            trv\u00e1n\u00ed\n+--------------------+------------------------------+--------------------\n|       id_transakce|                     ShareLock|            19:39:26\n|               n-tice|           AccessExclusiveLock|            00:03:35\n+--------------------+------------------------------+--------------------\n<\/pre>\n
<\/p>\n
Z\u00cdN\u00c1N\u00cd Z\u00c1MK\u016e PODLE TYPU Z\u00c1MKU<\/h3>\n
\nDotaz<\/b><\/p>\n
S\nt AS\n(\n\tVYBER\n\t\ttyp_z\u00e1mku  ,\n\t\tre\u017eim ,\n\t\tcount(*) jako celkem \n\tZ\n\t\tactivity_hist.archive_locking\n\tKDE \n\t\ttimepoint mezi pg_stat_history_begin+(current_hour_diff * interval '1 hour') A pg_stat_history_end+(current_hour_diff * interval '1 hour') A \n\t\tud\u011bleno\n\tSKUPINA PODLE \n\t\ttyp_z\u00e1mku  ,\n\t\tre\u017eim  \n)\nVYBER \n\ttyp_z\u00e1mku  ,\n\tre\u017eim ,\n\tdelka * interval '1 second' jako trv\u00e1n\u00ed\t\t\t\nZ t \t\t\n\u0158ADIT PODLE 3 DESC <\/code><\/pre>\n
\nP\u0159\u00edklad<\/b><\/p>\n
| Z\u00cdN\u00c1N\u00cd Z\u00c1MK\u016e PODLE TYPU Z\u00c1MKU\n+--------------------+------------------------------+--------------------\n|            typ_z\u00e1mku|                          re\u017eim|            trv\u00e1n\u00ed\n+--------------------+------------------------------+--------------------\n|            vztah|              RowExclusiveLock|            51:11:10\n|          virtualxid|                 ExclusiveLock|            48:10:43\n|       id_transakce|                 ExclusiveLock|            44:24:53\n|            vztah|               AccessShareLock|            20:06:13\n|               n-tice|           AccessExclusiveLock|            17:58:47\n|               n-tice|                 ExclusiveLock|            01:40:41\n|            vztah|      ShareUpdateExclusiveLock|            00:26:41\n|              objekt|              RowExclusiveLock|            00:00:01\n|       id_transakce|                     ShareLock|            00:00:01\n|              roz\u0161\u00ed\u0159en\u00ed|                 ExclusiveLock|            00:00:01\n+--------------------+------------------------------+--------------------\n<\/pre>\n
\nPodrobnosti o konkr\u00e9tn\u00edch dotazech queryid<\/p>\n
\u010cEK\u00c1N\u00cd NA Z\u00c1MKY PODLE TYPU Z\u00c1MKU PODLE QUERYID<\/h3>\n
\nDotaz<\/b><\/p>\n
S\nlt AS\n(\n\tVYBER\n\t\tpid , \n\t\ttyp_z\u00e1mku  ,\n\t\tre\u017eim ,\n\t\ttimepoint , \n\t\tqueryid , \n\t\tblokuj\u00edc\u00ed_pid ,\n                MIN ( timepoint ) NAD (PARTITION BY pid , typ_z\u00e1mku  ,re\u017eim ) jako za\u010d\u00e1tek  \n\tZ\n\t\tactivity_hist.archive_locking\n\tKDE \n\t\ttimepoint mezi pg_stat_history_begin+(current_hour_diff * interval '1 hour') A \n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 hour') A \n\t\tNEUD\u011aLEN\u00dd A\n\t       queryid NEN\u00cd NULL \n\tSKUPINA PODLE \n\t        pid , \n\t\ttyp_z\u00e1mku  ,\n\t\tre\u017eim ,\n\t\ttimepoint ,\n\t\tqueryid ,\n\t\tblokuj\u00edc\u00ed_pid \n)\nVYBER \n        lt.pid , \n\tlt.typ_z\u00e1mku  ,\n\tlt.re\u017eim ,\t\t\t\n        lt.za\u010d\u00e1tek ,\n\tlt.queryid  , \n\tlt.blokuj\u00edc\u00ed_pid ,\n\tCOUNT(*)  * interval '1 second'\t jako trv\u00e1n\u00ed\t\t\nZ lt \t\nSKUPINA PODLE \n\tlt.pid , \n        lt.typ_z\u00e1mku  ,\n\tlt.re\u017eim ,\t\t\t\n        lt.za\u010d\u00e1tek ,\n        lt.queryid ,\n\tlt.blokuj\u00edc\u00ed_pid \n\u0158ADIT PODLE 4<\/code><\/pre>\n
\nP\u0159\u00edklad<\/b><\/p>\n
| \u010cEK\u00c1N\u00cd NA Z\u00c1MKY DLE DRUH\u016e Z\u00c1MK\u016e PODLE QUERYID\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 locktype|                mode|                       started|             queryid|       blocking_pids|            duration\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|            transactionid|           ShareLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11626|            transactionid|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12380}|            00:00:29\n|     11626|            transactionid|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {11092}|            00:03:25\n|     11626|            transactionid|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12213}|            00:01:55\n|     11626|            transactionid|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12751}|            00:00:01\n|     11629|            transactionid|           ShareLock|    2019-09-17 10:00:24.331935|  389015618226997618|             {11092}|            00:03:22\n|     11629|            transactionid|           ShareLock|    2019-09-17 10:00:24.331935|  389015618226997618|             {12007}|            00:00:01\n|     12007|            transactionid|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11629}|            00:00:13\n|     12007|            transactionid|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11092}|            00:01:10\n|     12007|            transactionid|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11288}|            00:00:05\n|     12213|            transactionid|           ShareLock|    2019-09-17 10:06:07.328019|  389015618226997618|             {12007}|            00:00:10<\/pre>\n
<\/p>\n
Z\u00cdSK\u00c1V\u00c1N\u00cd Z\u00c1MK\u016e DLE DRUH\u016e Z\u00c1MK\u016e PODLE QUERYID<\/h3>\n
\nDotaz<\/b><\/p>\n
S\nlt AS\n(\n\tVYBER\n\t\tpid , \n\t\tlocktype  ,\n\t\tmode ,\n\t\ttimepoint , \n\t\tqueryid , \n\t\tblocking_pids ,\n                MIN ( timepoint ) OVER (PARTITION BY pid , locktype  ,mode ) as started  \n\tZ\n\t\tactivity_hist.archive_locking\n\tKDE \n\t\ttimepoint mezi pg_stat_history_begin+(current_hour_diff * interval '1 hour') A\n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 hour') A\n\t\tud\u011bleno A\n\t\tqueryid IS NOT NULL \n\tGROUP BY \n\t        pid , \n\t\tlocktype  ,\n\t\tmode ,\n\t\ttimepoint ,\n\t\tqueryid ,\n\t\tblocking_pids \n)\nVYBER \n        lt.pid , \n\tlt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.started ,\n\tlt.queryid  ,\n\tlt.blocking_pids ,\n\tCOUNT(*)  * interval '1 second'\t as duration\t\t\t\nZ lt \t\nGROUP BY \n\tlt.pid , \n\tlt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.started ,\n\tlt.queryid ,\n\tlt.blocking_pids \nORDER BY 4<\/code><\/pre>\n
\nP\u0159\u00edklad<\/b><\/p>\n
| ZAMYK\u00c1N\u00cd Z\u00c1MK\u016e PODLE TYPU Z\u00c1MKU PODLE QUERYID\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 typz\u00e1mku|                m\u00f3d|                       za\u010d\u00e1tek|             queryid|       blokuj\u00edc\u00ed_pid|            trv\u00e1n\u00ed\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|                 vztah|    \u0158\u00e1dkov\u00fdExkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11092|            transak\u010dn\u00edid|       Exkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|                 vztah|    \u0158\u00e1dkov\u00fdExkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:00:10\n|     11092|                 vztah|    \u0158\u00e1dkov\u00fdExkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11092|               virtu\u00e1ln\u00edid|       Exkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|               virtu\u00e1ln\u00edid|       Exkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11288|            transak\u010dn\u00edid|       Exkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11288|                    tuple| P\u0159\u00edstupov\u00fdExkluzivn\u00edZ\u00e1mek|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34<\/pre>\n
\nZpracov\u00e1n\u00ed historie z\u00e1mk\u016f p\u0159i anal\u00fdze incident\u016f v\u00fdkonu.<\/b><\/p>\n
    \n
  1. Dotaz s queryid=389015618226997618 vykon\u00e1van\u00fd procesem s pid=11288 \u010dekal na z\u00e1mek od 2019-09-17 10:00:00 po dobu 3 minut.<\/li>\n
  2. Z\u00e1mek dr\u017eel proces s pid=11092<\/li>\n
  3. Proces s pid=11092 vykon\u00e1vaj\u00edc\u00ed dotaz s queryid=389015618226997618 od 2019-09-17 10:00:00 dr\u017eel z\u00e1mek po dobu 3 minut.<\/li>\n<\/ol>\n
    <\/p>\n
    V\u00fdsledek<\/h2>\n
    \nTe\u010f douf\u00e1m, \u017ee za\u010dne to nejzaj\u00edmav\u011bj\u0161\u00ed a neju\u017eite\u010dn\u011bj\u0161\u00ed - sb\u011br statistik a anal\u00fdza p\u0159\u00edpad\u016f na historii \u010dek\u00e1n\u00ed a z\u00e1mk\u016f. <\/p>\n
    Do budoucna douf\u00e1m, \u017ee vznikne soubor pozn\u00e1mek (podobn\u011b jako metalink Oracle).<\/p>\n
    Vlastn\u011b pr\u00e1v\u011b z tohoto d\u016fvodu se pou\u017e\u00edv\u00e1 metodika, kter\u00e1 je co nejrychleji prezentov\u00e1na pro v\u0161eobecn\u00e9 sezn\u00e1men\u00ed.<\/p>\n
    Co nejd\u0159\u00edve se pokus\u00edm zve\u0159ejnit projekt na githubu.
    \n
    Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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