{"id":75678,"date":"2020-03-27T19:42:27","date_gmt":"2020-03-27T17:42:27","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/o-chem-molchit-explain-i-kak-ego-razgovorit"},"modified":"2020-03-27T19:42:27","modified_gmt":"2020-03-27T17:42:27","slug":"o-chem-molchit-explain-i-kak-ego-razgovorit","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/o-chem-molchit-explain-i-kak-ego-razgovorit","title":{"rendered":"Di cosa tace EXPLAIN e come farlo parlare","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Una domanda classica che i programmatori pongono al loro DBA o ai consulenti di business per PostgreSQL \u00e8 quasi sempre la stessa: <i>\u00abPerch\u00e9 le query impiegano cos\u00ec tanto tempo a eseguire?\u00bb<\/i><\/p>\n<p>Le ragioni tradizionali sono:<\/p>\n<ul>\n<li><b>algoritmo inefficiente<\/b><br \/>\nquando hai deciso di fare un JOIN di diverse CTE su decine di migliaia di record<\/li>\n<li><b>statistiche obsolete<\/b><br \/>\nse la distribuzione effettiva dei dati nella tabella differisce notevolmente da quanto raccolto da ANALYZE l'ultima volta<\/li>\n<li><b>strozzature delle risorse<\/b><br \/>\ne non ci sono pi\u00f9 sufficienti potenze computazionali della CPU, i gigabyte di memoria vengono utilizzati continuamente o il disco non riesce a tenere il passo con tutte le \u00abrichieste\u00bb del database<\/li>\n<li><b>blocco<\/b> da processi concorrenti<\/li>\n<\/ul>\n<p>\nE se le serrature sono abbastanza complesse da catturare e analizzare, per tutto il resto abbiamo bisogno di <b>un piano di query<\/b>, che possiamo ottenere tramite <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/using-explain\">l'operatore EXPLAIN<\/a><\/noindex> (<i>meglio, ovviamente, eseguire subito EXPLAIN (ANALYZE, BUFFERS) \u2026<\/i>) o <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/auto-explain\">il modulo auto_explain<\/a><\/noindex>.<\/p>\n<p>Ma, come si dice nella stessa documentazione, <\/p>\n<blockquote><p>\u00abCapire il piano \u00e8 un'arte e per padroneggiarlo \u00e8 necessaria una certa esperienza, \u2026\u00bb<\/p><\/blockquote>\n<p> Ma possiamo cavarcela anche senza, se utilizziamo uno strumento adatto!<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nCome appare di solito un piano di query? Qualcosa del genere:<\/p>\n<pre><code class=\"plaintext\">Index Scan using pg_class_relname_nsp_index on pg_class (tempo reale=0.049..0.050 righe=1 cicli=1)\n  Condizione indice: (relname = $1)\n  Filtro: (oid = $0)\n  Buffers: hit condiviso=4\n  InitPlan 1 (restituisce $0,$1)\n    -&gt;  Limit (tempo reale=0.019..0.020 righe=1 cicli=1)\n          Buffers: hit condiviso=1\n          -&gt;  Seq Scan on pg_class pg_class_1 (tempo reale=0.015..0.015 righe=1 cicli=1)\n                Filtro: (relkind = 'r'::&quot;char&quot;)\n                Rigate rimosse dal filtro: 5\n                Buffers: hit condiviso=1<\/code><\/pre>\n<p>\no qualcosa del genere:<\/p>\n<pre><code class=\"plaintext\">&quot;Append  (costo=868.60..878.95 righe=2 larghezza=233) (tempo reale=0.024..0.144 righe=2 cicli=1)&quot;\n&quot;  Buffers: hit condiviso=3&quot;\n&quot;  CTE cl&quot;\n&quot;    -&gt;  Seq Scan on pg_class  (costo=0.00..868.60 righe=9972 larghezza=537) (tempo reale=0.016..0.042 righe=101 cicli=1)&quot;\n&quot;          Buffers: hit condiviso=3&quot;\n&quot;  -&gt;  Limit  (costo=0.00..0.10 righe=1 larghezza=233) (tempo reale=0.023..0.024 righe=1 cicli=1)&quot;\n&quot;        Buffers: hit condiviso=1&quot;\n&quot;        -&gt;  CTE Scan on cl  (costo=0.00..997.20 righe=9972 larghezza=233) (tempo reale=0.021..0.021 righe=1 cicli=1)&quot;\n&quot;              Buffers: hit condiviso=1&quot;\n&quot;  -&gt;  Limit  (costo=10.00..10.10 righe=1 larghezza=233) (tempo reale=0.117..0.118 righe=1 cicli=1)&quot;\n&quot;        Buffers: hit condiviso=2&quot;\n&quot;        -&gt;  CTE Scan on cl cl_1  (costo=0.00..997.20 righe=9972 larghezza=233) (tempo reale=0.001..0.104 righe=101 cicli=1)&quot;\n&quot;              Buffers: hit condiviso=2&quot;\n&quot;Tempo di pianificazione: 0.634 ms&quot;\n&quot;Tempo di esecuzione: 0.248 ms&quot;<\/code><\/pre>\n<p>\nMa leggere il piano in forma testuale \u00aba voce alta\u00bb \u00e8 molto complicato e poco chiaro:<\/p>\n<ul>\n<li>nel nodo viene visualizzato <b>il totale delle risorse del sottoalbero<\/b><br \/>\ncio\u00e8, per capire quanto tempo \u00e8 stato speso per l'esecuzione di un nodo specifico, o quanto precisamente questa lettura dalla tabella ha recuperato dati dal disco, \u00e8 necessario sottrarre uno dall'altro<\/li>\n<li>il tempo del nodo \u00e8 necessario <b>da moltiplicare per loops<\/b><br \/>\ns\u00ec, la sottrazione non \u00e8 ancora l'operazione pi\u00f9 complicata da fare 'nella mente' \u2014 poich\u00e9 il tempo di esecuzione \u00e8 indicato come una media per una singola esecuzione di un nodo, e potrebbero essercene centinaia<\/li>\n<li>e tutto questo insieme rende difficile rispondere alla domanda principale \u2014 quindi chi \u00e8 <b>il 'collo di bottiglia'<\/b>?<\/li>\n<\/ul>\n<p>\nQuando abbiamo cercato di spiegare tutto questo a diverse centinaia dei nostri sviluppatori, ci siamo resi conto che dall'esterno questo appare pi\u00f9 o meno cos\u00ec:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/abb07e902639b5ec245851aa4a0edb58.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAh, quindi, abbiamo bisogno di...<\/p>\n<h2>Strumento<\/h2>\n<p>\nIn esso abbiamo cercato di raccogliere tutte le meccaniche chiave che aiutano a capire, in base al piano e alla richiesta, 'chi \u00e8 colpevole e cosa fare'. Bene, e parte della nostra esperienza da condividere con la comunit\u00e0.<br \/>\nBenvenuti e usate \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/explain.tensor.ru\/\">explain.tensor.ru<\/a><\/noindex> <\/p>\n<h3>Chiarezza dei piani<\/h3>\n<p>\n\u00c8 facile capire un piano quando appare in questo modo?<\/p>\n<pre><code class=\"plaintext\">Seq Scan on pg_class (tempo reale=0,009..1,304 righe=6609 cicli=1)\n  Buffers: hit condivisi=263\nTempo di pianificazione: 0,108 ms\nTempo di esecuzione: 1,800 ms\n<\/code><\/pre>\n<p>\nNon molto.<\/p>\n<p>Ma in questo modo, <b>in forma ridotta<\/b>, quando i parametri chiave sono separati \u2014 \u00e8 gi\u00e0 molto pi\u00f9 chiaro:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/18404ce800de847f1934ac2c7fef10be.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMa se il piano \u00e8 pi\u00f9 complesso, ci aiuter\u00e0 <b>grafico a torta della distribuzione temporale<\/b> per i nodi:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/ca9fdd07278801e4f3ad15e997efc1a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nE per le opzioni pi\u00f9 complicate, c'\u00e8 <b>diagramma di esecuzione<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/c03f358858206d7ccae20fd8142baa8c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAd esempio, ci sono situazioni piuttosto non banali in cui un piano pu\u00f2 avere pi\u00f9 di una radice effettiva:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/ea4f3f498737e9cc3f8f40c16a5bd1d7.png\" style=\"display:block;margin: 0 auto;\" \/><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/267273e8491d6b4403442672612c33ff.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Suggerimenti strutturali<\/h3>\n<p>\nE se tutta la struttura del piano e i suoi punti critici sono gi\u00e0 visibili, perch\u00e9 non evidenziarli per lo sviluppatore e non spiegarli in modo semplice?<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/0e7157a09f7f5707e769cc1d6a8f3af8.png\" style=\"display:block;margin: 0 auto;\" \/>Abbiamo gi\u00e0 raccolto un certo numero di questi modelli di raccomandazioni.<\/p>\n<h3>Profiler di query riga per riga<\/h3>\n<p>\nOra, se sovrapponiamo il piano analizzato alla query originale, possiamo vedere quanto tempo \u00e8 stato impiegato per ogni singolo operatore \u2014 in questo modo:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/0766d331798d529363d10006ace211f3.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u2026 o anche in questo modo:<\/p>\n<p><img decoding=\"async\" alt=\"Di cosa tace EXPLAIN e come farlo parlare\" src=\"\/wp-content\/uploads\/2020\/03\/4efd23d84792c5a7f54b40e86ff17353.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Sostituzione dei parametri nella query<\/h3>\n<p>\nSe hai \"agganciato\" al piano non solo la query, ma anche i suoi parametri dalla stringa DETAIL del log, puoi copiarlo anche in uno dei modi seguenti:<\/p>\n<ul>\n<li>con la sostituzione dei valori nella query<br \/>\nper l'esecuzione diretta sul tuo database e un'ulteriore profilazione<\/p>\n<pre><code class=\"sql\">SELECT 'const', 'param'::text;<\/code><\/pre>\n<\/li>\n<li>con la sostituzione dei valori tramite PREPARE\/EXECUTE<br \/>\nper simulare il funzionamento dello scheduler, quando la parte parametrica pu\u00f2 essere ignorata \u2014 ad esempio, quando si lavora su tabelle partizionate<\/p>\n<pre><code class=\"sql\">DEALLOCATE ALL;\nPREPARE q(text) AS SELECT 'const', $1::text;\nEXECUTE q('param'::text);\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><\/p>\n<h3>Archivio dei piani<\/h3>\n<p>\nInserisci, analizza, condividi con i colleghi! I piani rimarranno nell'archivio e potrai tornare a consultarli in seguito: <noindex><a rel=\"nofollow\" href=\"https:\/\/explain.tensor.ru\/archive\/\">explain.tensor.ru\/archive<\/a><\/noindex><\/p>\n<p>Ma se non vuoi che il tuo piano venga visto da altri, non dimenticare di spuntare l'opzione \u00abnon pubblicare nell'archivio\u00bb.<\/p>\n<p>Negli articoli successivi parler\u00f2 delle complessit\u00e0 e delle soluzioni che sorgono durante l'analisi del piano.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/tensor\/blog\/477624\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0432\u043e\u043f\u0440\u043e\u0441, \u0441 \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u043a \u0441\u0432\u043e\u0435\u043c\u0443 DBA \u0438\u043b\u0438 \u0432\u043b\u0430\u0434\u0435\u043b\u0435\u0446 \u0431\u0438\u0437\u043d\u0435\u0441\u0430 \u2014 \u043a \u043a\u043e\u043d\u0441\u0443\u043b\u044c\u0442\u0430\u043d\u0442\u0443 \u043f\u043e PostgreSQL, \u043f\u043e\u0447\u0442\u0438 \u0432\u0441\u0435\u0433\u0434\u0430 \u0437\u0432\u0443\u0447\u0438\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u043e: \u00ab\u041f\u043e\u0447\u0435\u043c\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0442\u0441\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 \u0442\u0430\u043a \u0434\u043e\u043b\u0433\u043e?\u00bb \u0422\u0440\u0430\u0434\u0438\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u043d\u0430\u0431\u043e\u0440 \u043f\u0440\u0438\u0447\u0438\u043d: \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c \u043a\u043e\u0433\u0434\u0430 \u0432\u044b \u0440\u0435\u0448\u0438\u043b\u0438 \u0441\u0434\u0435\u043b\u0430\u0442\u044c JOIN \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 CTE \u043f\u043e \u043f\u0430\u0440\u0435 \u0434\u0435\u0441\u044f\u0442\u043a\u043e\u0432 \u0442\u044b\u0441\u044f\u0447 \u0437\u0430\u043f\u0438\u0441\u0435\u0439 \u043d\u0435\u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u0430\u044f \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0430 \u0435\u0441\u043b\u0438 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u0443\u0436\u0435 \u0441\u0438\u043b\u044c\u043d\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75679,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-75678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0432\u043e\u043f\u0440\u043e\u0441, \u0441 \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u043a \u0441\u0432\u043e\u0435\u043c\u0443 DBA \u0438\u043b\u0438 \u0432\u043b\u0430\u0434\u0435\u043b\u0435\u0446 \u0431\u0438\u0437\u043d\u0435\u0441\u0430 \u2014 \u043a 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