{"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":"

Vazhdoi Artikulli «P\u00ebrpjekja p\u00ebr t\u00eb krijuar nj\u00eb analog t\u00eb ASH p\u00ebr PostgreSQL <\/a><\/noindex>«.<\/p>\n

Artikulli do t\u00eb shqyrtoj\u00eb dhe tregoj\u00eb p\u00ebrmes k\u00ebrkesave dhe shembujve konkret\u00eb \u2014 se cilat informacione t\u00eb dobishme mund t\u00eb merren nga historia e paraqitjes pg_locks.<\/p>\n

Kujdes.
\nN\u00eb lidhje me novitetin e tem\u00ebs dhe p\u00ebrfundimin e periudh\u00ebs s\u00eb testimit, artikulli mund t\u00eb p\u00ebrmbaj\u00eb gabime. Kritikat dhe v\u00ebrejtjet jan\u00eb gjithmon\u00eb t\u00eb mir\u00ebpritura dhe t\u00eb pritura.<\/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

CREATE TABLE archive_locking \n(       timepoint timestamp pa zon\u00eb kohore ,\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 \u2014 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 analog t\u00eb 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\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
\nShpjegim:<\/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
\nInformacion i p\u00ebrgjithsh\u00ebm, p\u00ebr proceset n\u00eb t\u00ebr\u00ebsi.<\/p>\n
PRITJA E BLLOKIMEVE NGA LLOJET E BLLOKIMEVE<\/h3>\n
\nK\u00ebrkes\u00eb<\/b><\/p>\n
ME\nt SI\n(\n\tZgjidhni \n\t\tlocktype  ,\n\t\tmode ,\n\t\tcount(*) si total \n\tNga \n\t\tactivity_hist.archive_locking\n\tKu \n\t\ttimepoint midis pg_stat_history_begin+(current_hour_diff * interval '1 hour') DHE pg_stat_history_end+(current_hour_diff * interval '1 hour') DHE \n\t\tNuk u dha\n\tGruponi sipas \n\t\tlocktype  ,\n\t\tmode  \n)\nZgjidhni \n\tlocktype  ,\n\tmode ,\n\ttotal * interval '1 second' si koh\u00eb\t\t\t\nNga t \t\t\nRendit sipas 3 ZMADHES <\/code><\/pre>\n
\nShembuj<\/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
\nK\u00ebrkes\u00eb<\/b><\/p>\n
ME\nt SI\n(\n\tZgjidhni \n\t\tlocktype  ,\n\t\tmode ,\n\t\tcount(*) si total \n\tNga \n\t\tactivity_hist.archive_locking\n\tKu \n\t\ttimepoint midis pg_stat_history_begin+(current_hour_diff * interval '1 hour') DHE pg_stat_history_end+(current_hour_diff * interval '1 hour') DHE \n\t\tu dha\n\tGruponi sipas \n\t\tlocktype  ,\n\t\tmode  \n)\nZgjidhni \n\tlocktype  ,\n\tmode ,\n\ttotal * interval '1 second' si koh\u00eb\t\t\t\nNga t \t\t\nRendit sipas 3 ZMADHES <\/code><\/pre>\n
\nShembuj<\/b><\/p>\n
| MARRJA E KLOKAVE NGA LLOJET E KLOKAVE\n+--------------------+------------------------------+--------------------\n|            lloji i klokes|                          moda|            koh\u00ebzgjatja\n+--------------------+------------------------------+--------------------\n|            marr\u00ebdh\u00ebnia|              RowExclusiveLock|            51:11:10\n|          virtualxid|                 ExclusiveLock|            48:10:43\n|       id e transaksionit|                 ExclusiveLock|            44:24:53\n|            marr\u00ebdh\u00ebnia|               AccessShareLock|            20:06:13\n|               tupel|           AccessExclusiveLock|            17:58:47\n|               tupel|                 ExclusiveLock|            01:40:41\n|            marr\u00ebdh\u00ebnia|      ShareUpdateExclusiveLock|            00:26:41\n|              objekti|              RowExclusiveLock|            00:00:01\n|       id e transaksionit|                     ShareLock|            00:00:01\n|              zgjatje|                 ExclusiveLock|            00:00:01\n+--------------------+------------------------------+--------------------\n<\/pre>\n
\nInformacion i detajuar p\u00ebr k\u00ebrkesat e ve\u00e7anta me queryid<\/p>\n
PO PRIT KLOKAT NGA LLOJET E KLOKAVE NGA QUERYID<\/h3>\n
\nK\u00ebrkes\u00eb<\/b><\/p>\n
ME\nlt SI\n(\n\tZBULO\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 ) si filluar  \n\tFROM \n\t\tactivity_hist.archive_locking\n\tKU\n\t\ttimepoint nd\u00ebrmjet pg_stat_history_begin+(current_hour_diff * interval '1 hour') DHE \n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 hour') DHE \n\t\tNuk u dha DHE\n\t       queryid NUK \u00ebsht\u00eb NULL \n\tGRUPI NGA \n\t        pid , \n\t\tlocktype  ,\n\t\tmode ,\n\t\ttimepoint ,\n\t\tqueryid ,\n\t\tblocking_pids \n)\nZBULO\n        lt.pid , \n\tlt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.filluar ,\n\tlt.queryid  ,\n\tlt.blocking_pids ,\n\tCOUNT(*)  * interval '1 second'\t si koh\u00ebzgjatje\t\t\nFROM lt \t\nGRUPI NGA \n\tlt.pid , \n        lt.locktype  ,\n\tlt.mode ,\t\t\t\n        lt.filluar ,\n        lt.queryid ,\n\tlt.blocking_pids \nRENDIT DHE 4<\/code><\/pre>\n
\nShembuj<\/b><\/p>\n
| PRITENDA E LOCKAVE NGA LLOJET DHE ID T\u00cb K\u00cbRKES\u00cbS\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
MARR\u00cbN LOCKASH ME LLOJ LOCKASH ME QUERYID<\/h3>\n
\nK\u00ebrkes\u00eb<\/b><\/p>\n
ME\nlt SI\n(\n\tZBJEDH\n\t\tpid , \n\t\tlloj_locku  ,\n\t\tmodi ,\n\t\tnokta_e_koh\u00ebs , \n\t\tqueryid , \n\t\tpid_blokues ,\n                MIN ( nokta_e_koh\u00ebs ) N\u00cb (SHKATHT\u00cbSI P\u00cbR pid , lloji_locku ,modi ) si filluar  \n\tFROM \n\t\tactivity_hist.archive_locking\n\tWHERE \n\t\tnokta_e_koh\u00ebs midis pg_stat_history_begin+(current_hour_diff * interval '1 or\u00eb') DHE \n\t\t\t                  pg_stat_history_end+(current_hour_diff * interval '1 or\u00eb') DHE \n\t\tpranuar DHE\n\t\tqueryid NUK \u00cbSHT\u00cb NULL \n\tGRUPI NGA \n\t        pid , \n\t\tlloj_locku  ,\n\t\tmodi ,\n\t\tnokta_e_koh\u00ebs ,\n\t\tqueryid ,\n\t\tpid_blokues \n)\nZBJEDH \n        lt.pid , \n\tlt.lloj_locku  ,\n\tlt.modi ,\t\t\t\n        lt.filluar ,\n\tlt.queryid  ,\n\tlt.pid_blokues ,\n\tCOUNT(*)  * interval '1 sekond'\t si koh\u00ebzgjatje\t\t\t\nFROM lt \t\nGRUPI NGA \n\tlt.pid , \n\tlt.lloj_locku  ,\n\tlt.modi ,\t\t\t\n        lt.filluar ,\n\tlt.queryid ,\n\tlt.pid_blokues \nRUJTO KRENARE 4<\/code><\/pre>\n
\nShembuj<\/b><\/p>\n
| MARRJA E BLLOKIMEVE NGA LLOJET E BLLOKIMEVE ME QUERYID\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|       pid|                 lloji i bllokimit|                m\u00ebnyra|                       fillimi|             queryid|       bllokimi_pidve|            koh\u00ebzgjatja\n+----------+-------------------------+--------------------+------------------------------+--------------------+--------------------+--------------------\n|     11288|                 marr\u00ebdh\u00ebnia|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|             {11092}|            00:03:34\n|     11092|            id transaksioni|       ExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:03:34\n|     11288|                 marr\u00ebdh\u00ebnia|    RowExclusiveLock|    2019-09-17 10:00:00.302936|  389015618226997618|                  {}|            00:00:10\n|     11092|                 marr\u00ebdh\u00ebnia|    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|            id transaksioni|       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 historikut t\u00eb bllokimeve p\u00ebr analiz\u00ebn e incidenteve t\u00eb performanc\u00ebs.<\/b><\/p>\n
    \n
  1. K\u00ebrkesa me queryid=389015618226997618 e ekzekutuar nga procesi me pid=11288 priste bllokimin q\u00eb nga 2019-09-17 10:00:00 p\u00ebr gjat\u00eb 3 minutash.<\/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 gjat\u00eb 3 minutash.<\/li>\n<\/ol>\n
    <\/p>\n
    P\u00ebrfundimi<\/h2>\n
    \nTani, shpresoj q\u00eb t\u00eb filloj\u00eb m\u00eb interesanti dhe i dobishmi \u2013 mbledhja e statistikave dhe analiza e rasteve nga historiku i pritjeve dhe bllokimeve. <\/p>\n
    N\u00eb perspektiv\u00eb, shpresoj t\u00eb krijohet nj\u00eb grup i disa si nota (ngjash\u00ebm me metalinkun e Oracle).<\/p>\n
    N\u00eb t\u00eb v\u00ebrtet\u00eb, pik\u00ebrisht p\u00ebr k\u00ebt\u00eb arsye metodika e p\u00ebrdorur del sa m\u00eb shpejt p\u00ebr njohjen e p\u00ebrgjithshme.<\/p>\n
    N\u00eb koh\u00ebn m\u00eb t\u00eb af\u00ebrt do t\u00eb p\u00ebrpiqem ta ngarkoj 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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