{"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\/sq\/blog\/administrirovanie\/odin-iz-metodov-polucheniya-istorii-blokirovok-v-postgresql","title":{"rendered":"Nj\u00eb nga metodat p\u00ebr t\u00eb marr\u00eb historin\u00eb e bllokimeve n\u00eb PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Vazhdimi i artikullit «P\u00ebrpjekje p\u00ebr t\u00eb krijuar nj\u00eb analog ASH p\u00ebr PostgreSQL <\/a><\/noindex>«.<\/p>\n

Artikulli do t\u00eb shqyrtoj\u00eb dhe do t\u00eb tregoj\u00eb n\u00eb k\u00ebrkesa dhe shembuj specifik\u00eb - \u00e7far\u00eb informacioni t\u00eb dobish\u00ebm mund t\u00eb merrni me ndihm\u00ebn e historis\u00eb s\u00eb paraqitjes pg_locks.<\/p>\n

Kujdes.
\nP\u00ebr shkak t\u00eb risis\u00eb s\u00eb tem\u00ebs dhe p\u00ebrfundimit t\u00eb periudh\u00ebs s\u00eb testimit, artikulli mund t\u00eb p\u00ebrmbaj\u00eb gabime. K\u00ebrkesa dhe v\u00ebrejtje jan\u00eb gjithmon\u00eb t\u00eb mir\u00ebpritura dhe priten.<\/p><\/blockquote>\n

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

T\u00eb dh\u00ebnat hyr\u00ebse<\/h2>\n

<\/p>\n

Historia e paraqitjes pg_locks<\/h3>\n

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

KRIJONI TABEL\u00cbN archive_locking \n(       timepoint timestamp pa zon\u00eb kohe ,\n\tlocktype tekst ,\n\trelation oid ,\n\tmode tekst ,\n\ttid xid ,\n\tvtid tekst ,\n\tpid integer ,\n\tblocking_pids integer[] ,\n\tgranted boolean ,\n        queryid bigint \n);<\/code><\/pre>\n
\nN\u00eb thelb, tabela \u00ebsht\u00eb e ngjashme me tabel\u00ebn archive_pg_stat_activity<\/b>, e p\u00ebrshkruar m\u00eb holl\u00ebsisht k\u00ebtu - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? <\/a><\/noindex> dhe k\u00ebtu \u2014 P\u00ebrpjekja p\u00ebr t\u00eb krijuar nj\u00eb ngjashm\u00ebri ASH p\u00ebr PostgreSQL.<\/a><\/noindex><\/p>\n
P\u00ebr t\u00eb mbushur kolon\u00ebn queryid<\/b> p\u00ebrdoret funksioni <\/p>\n
update_history_locking_by_queryid<\/b><\/p>\n
--update_history_locking_by_queryid.sql\nKRIJONI O P\u00cbRMBAJ ME FUNKSION update_history_locking_by_queryid() KTHE NJ\u00cb boolean AS $$\nSHKRUANI\n  rezultati boolean ;\n  current_minute double precision ; \n  \n  start_minute integer ;\n  finish_minute integer ;\n  \n  start_period timestamp pa zon\u00eb kohe ;\n  finish_period timestamp pa zon\u00eb kohe ;\n  \n  lock_rec rekord ; \n  endpoint_rec rekord ;\n  \n  current_hour_diff double precision ;\nKRIJONI\n  RAISE NOTICE '***update_history_locking_by_queryid';\n  \n  rezultati = TRUE ;\n  \n  current_minute = extract ( minute nga tani() );\n\n  ZGJIDHNI * NGA endpoint KU \u00ebsht\u00eb_nevoj\u00eb_monitorimi\n  N\u00cb endpoint_rec ;\n  \n  current_hour_diff = endpoint_rec.hour_diff ;\n  \n  N\u00cbSE current_minute < 5 \n  AT\u00cbHER\u00cb\n\tRAISE NOTICE 'Koha aktuale \u00ebsht\u00eb m\u00eb e vog\u00ebl se 5 minuta.';\n\t\n\tstart_period = date_trunc('or\u00eb', tani()) + (current_hour_diff * interval '1 or\u00eb');\n    finish_period = start_period - interval '5 minuta' ;\n  ND\u00cbRKOHE \n    finish_minute = extract ( minute nga tani() ) \/ 5 ;\n    start_minute =  finish_minute - 1 ;\n  \n    start_period = date_trunc('or\u00eb', tani()) + interval '1 minut\u00eb'*start_minute*5+(current_hour_diff * interval '1 or\u00eb');\n    finish_period = date_trunc('or\u00eb', tani()) + interval '1 minut\u00eb'*finish_minute*5+(current_hour_diff * interval '1 or\u00eb') ;\n    \n  FUNDIF \n  \n  RAISE NOTICE 'start_period = %', start_period;\n  RAISE NOTICE 'finish_period = %', finish_period;\n\n\tP\u00cbR lock_rec N\u00cb   \n\tME act_queryid SI\n\t (\n\t\tZGJIDHNI \n\t\t\t\tpid , \n\t\t\t\timepoint ,\n\t\t\t\tquery_start SI filluar ,\t\t\t\n\t\t\t\tMAX(timepoint) OVER (PARTICIPIM NGA pid ,\tquery_start   ) SI p\u00ebrfunduar ,\t\t\t\n\t\t\t\tqueryid \n\t\tMARR NGA \n\t\t\t\tactivity_hist.history_pg_stat_activity \t\t\t\n\t\tKU \t\t\t\n\t\t\t\ttimepoint MIDIS start_period dhe \n\t\t\t\t\t\t\t\t finish_period\n\t\tGRUPI NGA \n\t\t\t\tpid , \n\t\t\t\timepoint ,  \n\t\t\t\tquery_start ,\n\t\t\t\tqueryid \n\t ),\n\t lock_pids SI\n\t\t(\n\t\t\tZGJIDHNI\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 (PARTICIPIM NGA pid , locktype  ,mode ) si filluar \n\t\t\tMARR NGA \n\t\t\t\tactivity_hist.history_locking hl\n\t\t\tKU \n\t\t\t\thl.timepoint midis start_period dhe \n\t\t\t\t\t\t\t\t     finish_period\n\t\t\tGRUPI NGA \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\tZGJIDHNI \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.filluar MIDIS aq.filluar DHE aq.p\u00ebrfunduar )\n\tKU aq.queryid \u00cbSHTE E SAKT\u00cb \n\tGRUPI NGA  \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\tKU pid = lock_rec.pid DHE locktype = lock_rec.locktype DHE mode = lock_rec.mode DHE timepoint = lock_rec.timepoint ;\t\n\tFUNDO LOOP;    \n  \n  KTHE rezultatin ;\nFUND\n$$ GJUHA plpgsql;<\/code><\/pre>\n
\nShpjegimi:<\/b> Vlera e kolon\u00ebs queryid p\u00ebrdit\u00ebsohet n\u00eb tabel\u00ebn history_locking, dhe m\u00eb pas kur krijohet nj\u00eb seksion i ri p\u00ebr tabel\u00ebn archive_locking, vlera do t\u00eb ruhet n\u00eb vlerat historike. <\/p>\n
T\u00eb dh\u00ebnat dal\u00ebse<\/h2>\n
\nInformacione t\u00eb p\u00ebrgjithshme p\u00ebr proceset n\u00eb t\u00ebr\u00ebsi.<\/p>\n
PRITJA E Bllokimeve NGA LLOJET E BLLOKIMEVE<\/h3>\n
\nPyetje<\/b><\/p>\n
ME\nt SI\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
\nShembulli<\/b><\/p>\n
| PRITJA E Bllokimeve NGA LLOJET E BLLOKIMEVE\n+--------------------+------------------------------+--------------------\n|            locktype|                          mode|            duration\n+--------------------+------------------------------+--------------------\n|       transactionid|                     ShareLock|            19:39:26\n|               tuple|           AccessExclusiveLock|            00:03:35\n+--------------------+------------------------------+--------------------\n<\/pre>\n
<\/p>\n
Marrjet e Bllokimeve NGA LLOJET E BLLOKIMEVE<\/h3>\n
\nPyetje<\/b><\/p>\n
ME\nt SI\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
\nShembulli<\/b><\/p>\n
| MARRJET E Bllokimeve NGA LLOJET E BLLOKIMEVE\n+--------------------+------------------------------+--------------------\n|            locktype|                          mode|            duration\n+--------------------+------------------------------+--------------------\n|            relation|              RowExclusiveLock|            51:11:10\n|          virtualxid|                 ExclusiveLock|            48:10:43\n|       transactionid|                 ExclusiveLock|            44:24:53\n|            relation|               AccessShareLock|            20:06:13\n|               tuple|           AccessExclusiveLock|            17:58:47\n|               tuple|                 ExclusiveLock|            01:40:41\n|            relation|      ShareUpdateExclusiveLock|            00:26:41\n|              object|              RowExclusiveLock|            00:00:01\n|       transactionid|                     ShareLock|            00:00:01\n|              extend|                 ExclusiveLock|            00:00:01\n+--------------------+------------------------------+--------------------\n<\/pre>\n
\nInformacione t\u00eb detajuara p\u00ebr k\u00ebrkesat e caktuara me queryid<\/p>\n
PRITJA E Bllokimeve NGA LLOJET E BLLOKIMEVE NGA QUERYID<\/h3>\n
\nPyetje<\/b><\/p>\n
ME\nlt SI\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
\nShembulli<\/b><\/p>\n
| P\u00cbR PRITJE T\u00cb Bllokimeve NGA LLOJET E Bllokimit NGA 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
MARRJA E Bllokimeve NGA LLOJET E Bllokimit NGA QUERYID<\/h3>\n
\nPyetje<\/b><\/p>\n
ME\nlt SI\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\tgranted AND\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)\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\t\nFROM lt \t\nGROUP BY \n\tlt.pid , \n\tlt.locktype  ,\n\t\t\tlt.mode ,\n\t\t\t\n        lt.started ,\n\tlt.queryid ,\n\tlt.blocking_pids \nORDER BY 4<\/code><\/pre>\n
\nShembulli<\/b><\/p>\n
| MARRJA E BLOKIMEVE NGA LLOJE T\u00cb BLOKIMEVE NGA QUERYID\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 lloji i bllokimit|                moda|                       filluar|             queryid|       bllokimi_pids|            koha\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|                 marr\u00ebdh\u00ebnie|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11092|            identifikimi i transaksionit|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|                 marr\u00ebdh\u00ebnie|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:00:10\n|     11092|                 marr\u00ebdh\u00ebnie|    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|            identifikimi i transaksionit|       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
\nP\u00ebrdorimi i historis\u00eb s\u00eb bllokimit p\u00ebr analiz\u00ebn e incidenteve t\u00eb performanc\u00ebs.<\/b><\/p>\n
    \n
  1. K\u00ebrkesa me queryid=389015618226997618 e cila po ekzekutohet nga procesi me pid=11288 ka pritur bllokimin q\u00eb nga 2019-09-17 10:00:00 p\u00ebr 3 minuta.<\/li>\n
  2. Bllokimin e mbante procesi me pid=11092<\/li>\n
  3. Procesi me pid=11092 duke ekzekutuar k\u00ebrkes\u00ebn me queryid=389015618226997618 q\u00eb nga 2019-09-17 10:00:00 mbante bllokimin p\u00ebr 3 minuta.<\/li>\n<\/ol>\n
    <\/p>\n
    P\u00ebrfundimi<\/h2>\n
    \nTani, shpresoj, do t\u00eb filloj\u00eb gj\u00ebja m\u00eb interesante dhe t\u00eb dobishme - mbledhja e statistikave dhe analiza e rasteve t\u00eb historis\u00eb s\u00eb pritjeve dhe bllokimeve. <\/p>\n
    N\u00eb perspektiv\u00eb, shpresoj, do t\u00eb arrijm\u00eb nj\u00eb grup disa si nota (n\u00eb analogji me metalinkun e Oraklit).<\/p>\n
    K\u00ebshtu q\u00eb pik\u00ebrisht nga kjo arsye, metodika e p\u00ebrdorur, nxirret sa m\u00eb shpejt p\u00ebr njohjen e p\u00ebrgjithshme.<\/p>\n
    N\u00eb koh\u00ebt m\u00eb t\u00eb af\u00ebrta do t\u00eb p\u00ebrpiqem t\u00eb publikoj projektin n\u00eb github.
    \n
    Burimi: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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