{"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\/et\/blog\/administrirovanie\/odin-iz-metodov-polucheniya-istorii-blokirovok-v-postgresql","title":{"rendered":"\u00dcks meetod PostgreSQL-i lukustamise ajaloo saamiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

J\u00e4tkub artikkel «Katse luua ASH-i analoog PostgreSQL-ile <\/a><\/noindex>«.<\/p>\n

Artiklis k\u00e4sitletakse ja tuuakse konkreetsed p\u00e4ringud ja n\u00e4ited, et n\u00e4idata, millist kasulikku teavet saab pg_locks ajaloo abil saada.<\/p>\n

Hoiatus.
\nSeoses teema uudsetega ja katseperioodi t\u00e4iendamisega v\u00f5ib artikkel sisaldada vigu. Kritika ja m\u00e4rkused on teretulnud ja oodatud.<\/p><\/blockquote>\n

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

Sisendandmed<\/h2>\n

<\/p>\n

pg_locks vaatamise ajalugu<\/h3>\n

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

Loo tabel 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
\nSisuliselt on tabel sarnane tabeliga archive_pg_stat_activity<\/b>, nagu on siin \u00fcksikasjalikult kirjeldatud \u2014 pg_stat_statements + pg_stat_activity + loq_query = pg_ash? <\/a><\/noindex> ja siin \u2014 Katse luua ASH-i analoog PostgreSQL-ile.<\/a><\/noindex><\/p>\n
Veerust queryid<\/b> t\u00e4itmiseks kasutatakse funktsiooni <\/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
\nSelgitus:<\/b> veerg queryid v\u00e4\u00e4rtus uuendatakse tabelis history_locking ja seej\u00e4rel, kui luuakse uus jaotis tabelile archive_locking, salvestatakse v\u00e4\u00e4rtus ajalukku. <\/p>\n
V\u00e4ljund<\/h2>\n
\n\u00dcldinfo protsesside kohta.<\/p>\n
LOCKTIPID JA LOCKT\u00dc\u00dcPID<\/h3>\n
\nP\u00e4ring<\/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
\nN\u00e4ide<\/b><\/p>\n
| LOCKTIPID JA LOCKT\u00dc\u00dcPID\n+--------------------+------------------------------+--------------------\n|            locktype|                          mode|            duration\n+--------------------+------------------------------+--------------------\n|       transactionid|                     ShareLock|            19:39:26\n|               tuple|           AccessExclusiveLock|            00:03:35\n+--------------------+------------------------------+--------------------\n<\/pre>\n
<\/p>\n
LOCKTIPID JA LOCKT\u00dc\u00dcPID<\/h3>\n
\nP\u00e4ring<\/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\tgranted\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
\nN\u00e4ide<\/b><\/p>\n
| LUKUSTE OMANDMINE LUKUT\u00dc\u00dcPIDE J\u00c4RGE\n+--------------------+------------------------------+--------------------\n|            lukut\u00fc\u00fcp|                          re\u017eiim|            kestus\n+--------------------+------------------------------+--------------------\n|            suhe|              RowExclusiveLock|            51:11:10\n|          virtuaalid|                 ExclusiveLock|            48:10:43\n|       tehingu ID|                 ExclusiveLock|            44:24:53\n|            suhe|               AccessShareLock|            20:06:13\n|               tupel|           AccessExclusiveLock|            17:58:47\n|               tupel|                 ExclusiveLock|            01:40:41\n|            suhe|      ShareUpdateExclusiveLock|            00:26:41\n|              objekt|              RowExclusiveLock|            00:00:01\n|       tehingu ID|                     ShareLock|            00:00:01\n|              laiend|                 ExclusiveLock|            00:00:01\n+--------------------+------------------------------+--------------------\n<\/pre>\n
\nDetailne teave konkreetsete queryid p\u00e4ringute kohta<\/p>\n
OOTAMINE LUKUSTE J\u00c4RGE LUKUT\u00dc\u00dcPIDE KOHTA QUERYID P\u00c4RINGUTE KOHTA<\/h3>\n
\nP\u00e4ring<\/b><\/p>\n
WITH\nlt AS\n(\n\tSELECT\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\tFROM \n\t\tactivity_hist.archive_locking\n\tWHERE \n\t\ttimepoint between pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND \n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 hour') AND \n\t\tNOT granted AND\n\t       queryid 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)\nSELECT \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\nFROM lt \t\nGROUP BY \n\tlt.pid , \n        lt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.started ,\n        lt.queryid ,\n\tlt.blocking_pids \nORDER BY 4<\/code><\/pre>\n
\nN\u00e4ide<\/b><\/p>\n
| OOTAMIS T\u00d5KKEDE KINNIPEETUD T\u00dc\u00dcBID K\u00dcSIMUSTE ID ALUSEL\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 lukut\u00fc\u00fcp|                re\u017eiim|                       algus|             k\u00fcsimuse_id|       blokeerimise_pid|            kestus\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|            tehingu_id|           ShareLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11626|            tehingu_id|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12380}|            00:00:29\n|     11626|            tehingu_id|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {11092}|            00:03:25\n|     11626|            tehingu_id|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12213}|            00:01:55\n|     11626|            tehingu_id|           ShareLock|    2019-09-17 10:00:21.380921|  389015618226997618|             {12751}|            00:00:01\n|     11629|            tehingu_id|           ShareLock|    2019-09-17 10:00:24.331935|  389015618226997618|             {11092}|            00:03:22\n|     11629|            tehingu_id|           ShareLock|    2019-09-17 10:00:24.331935|  389015618226997618|             {12007}|            00:00:01\n|     12007|            tehingu_id|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11629}|            00:00:13\n|     12007|            tehingu_id|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11092}|            00:01:10\n|     12007|            tehingu_id|           ShareLock|    2019-09-17 10:05:03.327933|  389015618226997618|             {11288}|            00:00:05\n|     12213|            tehingu_id|           ShareLock|    2019-09-17 10:06:07.328019|  389015618226997618|             {12007}|            00:00:10<\/pre>\n
<\/p>\n
LOCKIT\u00dc\u00dcDID LOCKT\u00dc\u00dcPIDE KOHTA K\u00dcSIMUSE ID J\u00c4RGI<\/h3>\n
\nP\u00e4ring<\/b><\/p>\n
KAUGEND\nlt AS\n(\n\tVALI\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\tFROM \n\t\tactivity_hist.archive_locking\n\tKUS\n\t\ttimepoint on pg_stat_history_begin+(current_hour_diff * interval '1 hour') JA \n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 hour') JA \n\t\tgranted JA\n\t\tqueryid EI OLE NULL \n\tGRUPPEERI \n\t        pid , \n\t\tlocktype  ,\n\t\tmode ,\n\t\ttimepoint ,\n\t\tqueryid ,\n\t\tblocking_pids \n)\nVALI \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\nFROM lt \t\nGRUPPEERI \n\tlt.pid , \n\tlt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.started ,\n\tlt.queryid ,\n\tlt.blocking_pids \nJ\u00c4RJE NING 4<\/code><\/pre>\n
\nN\u00e4ide<\/b><\/p>\n
| LUKUSTE V\u00d5TMINE LOCKT\u00dc\u00dcPIDEGA K\u00dcSIMUS-ID M\u00dc\u00dcDID\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 locktype|                mode|                       started|             queryid|       blocking_pids|            duration\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|                 relation|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11092|            transactionid|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|                 relation|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:00:10\n|     11092|                 relation|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11092|               virtualxid|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|               virtualxid|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11288|            transactionid|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11288|                    tuple| AccessExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34<\/pre>\n
\nBlokeerimise ajaloo kasutamine j\u00f5udluse probleemide anal\u00fc\u00fcsimisel.<\/b><\/p>\n
    \n
  1. K\u00fcsimus, mille queryid on 389015618226997618, ootas protsessiga, mille pid on 11288, lukustamist alates 2019-09-17 10:00:00 kolme minuti jooksul.<\/li>\n
  2. Lukustust hoidis protsess, mille pid on 11092.<\/li>\n
  3. Protsess, mille pid on 11092, t\u00e4ites p\u00e4ringut queryid 389015618226997618 alates 2019-09-17 10:00:00, hoidis lukustust kolme minuti jooksul.<\/li>\n<\/ol>\n
    <\/p>\n
    Kokkuv\u00f5te<\/h2>\n
    \nN\u00fc\u00fcd, loodan, et algab midagi t\u00f5eliselt huvitavat ja kasulikku - statistika kogumine ja juhtumite anal\u00fc\u00fcs oote- ja lukustamise ajaloost. <\/p>\n
    Tulevikus, loodan, et \u00f5nnestub luua teatud m\u00e4\u00e4ral note (analoog Oraakli metallinkidele).<\/p>\n
    H\u00e4sti, just seet\u00f5ttu esitatakse kasutatav meetod maksimaalselt kiiresti \u00fchiste teadmiste jaoks.<\/p>\n
    K\u00e4esoleval ajal p\u00fc\u00fcan projekti varsti githubi \u00fcles laadida.
    \n
    Allikas: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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Artiklis vaadatakse ja n\u00e4idatakse konkreetsete p\u00e4ringute ja n\u00e4idete kaudu, millist kasulikku teavet saab saadud pg_locks ajaloo kaudu. Teade: Arvestades teema uut olemust ja testperioodi l\u00f5puleviimist, v\u00f5ib artiklis esineda vigu. Kriitika ja m\u00e4rkused on alati oodatud ning teretulnud. 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