{"id":36155,"date":"2019-10-31T22:09:53","date_gmt":"2019-10-31T19:09:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kachestvo-dannyh-v-hranilishhe\/"},"modified":"2019-10-31T22:09:53","modified_gmt":"2019-10-31T19:09:53","slug":"kachestvo-dannyh-v-hranilishhe","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/kachestvo-dannyh-v-hranilishhe","title":{"rendered":"Qualit\u00e0 dei dati nello storage","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>La qualit\u00e0 dei dati nel database \u00e8 un prerequisito fondamentale per ottenere informazioni preziose. Una scarsa qualit\u00e0 porta a una reazione a catena negativa a lungo termine.<br \/>\nPer prima cosa, si perde fiducia nelle informazioni fornite. Le persone iniziano a utilizzare meno le applicazioni di Business Intelligence, e il potenziale delle applicazioni rimane inespresso.<br \/>\nDi conseguenza, si mette in discussione ulteriori investimenti nel progetto analitico.<\/p>\n<h4>Responsabilit\u00e0 per la qualit\u00e0 dei dati<\/h4>\n<p>\nL'aspetto legato al miglioramento della qualit\u00e0 dei dati \u00e8 di estrema importanza nei progetti BI. Tuttavia, non \u00e8 un privilegio riservato solo ai tecnici.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nAnche aspetti come<\/p>\n<p><b>La cultura aziendale<\/b><\/p>\n<ul>\n<li>I dipendenti stessi sono interessati a produrre una buona qualit\u00e0?<\/li>\n<li>In caso contrario, perch\u00e9? Potrebbe esserci un conflitto di interessi.<\/li>\n<li>Esistono regole aziendali che definiscono i responsabili della qualit\u00e0?<\/li>\n<\/ul>\n<p>\n<b>Processi<\/b><\/p>\n<ul>\n<li>Quali dati vengono generati alla fine di queste catene?<\/li>\n<li>Le operazioni potrebbero essere configurate in modo tale da dover 'farsi strada' per riflettere questa o quella situazione nella realt\u00e0.<\/li>\n<li>I sistemi operativi effettuano da soli il controllo e la verifica dei dati?<\/li>\n<\/ul>\n<p>\nTutti all'interno dell'organizzazione sono responsabili della qualit\u00e0 dei dati nei sistemi di reportistica.<\/p>\n<h4>Definizione e significato<\/h4>\n<p>\nLa qualit\u00e0 \u00e8 la conferma della soddisfazione delle aspettative del cliente.<\/p>\n<p>Tuttavia, la qualit\u00e0 dei dati non contiene una definizione intrinseca. Essa riflette sempre il contesto d'uso. Il data warehouse e il sistema BI hanno scopi diversi rispetto al sistema operativo da cui i dati provengono.<\/p>\n<p>Ad esempio, in un sistema operativo l'attributo cliente pu\u00f2 non essere un campo obbligatorio. Nel data warehouse, questo attributo pu\u00f2 essere utilizzato come misura e la sua compilazione \u00e8 obbligatoria. Ci\u00f2 comporta, a sua volta, la necessit\u00e0 di riempire il campo con valori di default.<\/p>\n<p>I requisiti per il data warehouse cambiano costantemente e sono generalmente pi\u00f9 elevati rispetto a quelli dei sistemi operativi. Ma pu\u00f2 essere anche il contrario, quando nel data warehouse non \u00e8 necessario conservare informazioni dettagliate dal sistema operativo.<\/p>\n<p>Per rendere la qualit\u00e0 dei dati misurabile, devono essere descritti i suoi standard. Le persone che utilizzano informazioni e numeri per il proprio lavoro devono essere coinvolte nel processo di descrizione. Il risultato di questo coinvolgimento pu\u00f2 essere una regola che permette, a colpo d'occhio, di stabilire se ci sia un errore o meno. Questa regola deve essere formalizzata in forma di script\/codice per la verifica successiva.<\/p>\n<h4>Miglioramento della qualit\u00e0 dei dati<\/h4>\n<p>\nNon \u00e8 possibile ripulire e correggere tutti gli errori ipotetici durante il caricamento dei dati nel repository. Una buona qualit\u00e0 dei dati pu\u00f2 essere raggiunta solo attraverso una stretta collaborazione tra tutti i partecipanti. Le persone che inseriscono dati nei sistemi operativi devono sapere quali azioni portano a errori.<\/p>\n<p>La qualit\u00e0 dei dati \u00e8 un processo. Purtroppo, molte organizzazioni non hanno una strategia per il miglioramento continuo. Molti si limitano a conservare i dati, senza sfruttare appieno il potenziale dei sistemi analitici. Di norma, nella realizzazione dei data warehouse, il 70-80% del budget viene speso per implementare l'integrazione dei dati. Il processo di controllo e miglioramento rimane incompleto, se non del tutto trascurato.<\/p>\n<h4>Strumenti<\/h4>\n<p>\nL'uso di strumenti software pu\u00f2 agevolare l'automazione del miglioramento e del monitoraggio della qualit\u00e0 dei dati. Ad esempio, possono automatizzare completamente la verifica tecnica delle strutture di archiviazione: il formato dei campi, la presenza di valori predefiniti, e la conformit\u00e0 ai requisiti dei nomi dei campi delle tabelle.<\/p>\n<p>La verifica del contenuto pu\u00f2 risultare pi\u00f9 complessa. Poich\u00e9 i requisiti per l'archiviazione cambiano, pu\u00f2 mutare anche l'interpretazione dei dati. Lo strumento stesso pu\u00f2 trasformarsi in un enorme progetto che richiede manutenzione.<\/p>\n<h4>Suggerimento<\/h4>\n<p>\nI database relazionali, in cui di solito vengono progettati gli archivi, hanno l'ottima capacit\u00e0 di creare viste. Queste possono essere utilizzate per una rapida verifica dei dati, se si conoscono le peculiarit\u00e0 dei contenuti. Ogni caso di errore o problema nei dati pu\u00f2 essere registrato come una query al database.<\/p>\n<p>In questo modo, si former\u00e0 una base di conoscenza sui contenuti. Naturalmente, tali richieste devono essere rapide. In genere, la gestione delle visualizzazioni richiede meno tempo umano rispetto agli strumenti organizzati in tabelle. La visualizzazione \u00e8 sempre pronta a mostrare il risultato del controllo.<br \/>\nNel caso di rapporti importanti, la visualizzazione pu\u00f2 contenere una colonna con il destinatario. Ha senso utilizzare gli stessi strumenti di BI per creare rapporti sullo stato della qualit\u00e0 dei dati nel deposito.<\/p>\n<h4>Esempio<\/h4>\n<p>\nLa query \u00e8 scritta per un database Oracle. In questo esempio, i test restituiscono un valore numerico, che pu\u00f2 essere interpretato come necessario. I valori di T_MIN e T_MAX possono regolare il livello di allerta. Il campo REPORT era un tempo utilizzato come messaggio in un prodotto ETL commerciale, che non riusciva a inviare email in modo adeguato, quindi rpad \u00e8 un \"workaround\".<\/p>\n<p>Nel caso di una grande tabella, si pu\u00f2 aggiungere, ad esempio, AND ROWNUM &lt;= 10, cio\u00e8 se si sono verificate 10 errori, questo \u00e8 sufficiente per attivare l&#039;allerta.<\/p>\n<pre><code class=\"sql\">CREA O SOSTITUISCI LA VISTA V_QC_DIM_PRODUCT_01 COME\nSELEZIONA\n  CASE WHEN OUTPUT&gt;=T_MIN E OUTPUT&lt;=T_MAX\n  ALLORA &#039;OK&#039; ALTRO &#039;ERRORE&#039; FINE COME RISULTATO,\n  DESCRIZIONE,\n  NOME_TABELL,\n  OUTPUT,\n  T_MIN,\n  T_MAX,\n  rpad(DESCRIZIONE,60,&#039; &#039;) || rpad(OUTPUT,8,&#039; &#039;) || rpad(T_MIN,8,&#039; &#039;) || rpad(T_MAX,8,&#039; &#039;) COME REPORT\nDA (-- Il test stesso\n  SELEZIONA\n    &#039;DIM_PRODUCT&#039; COME NOME_TABELL,\n    &#039;Conteggio degli spazi vuoti&#039; COME DESCRIZIONE,\n    COUNT(*) COME OUTPUT,\n    0 COME T_MIN,\n    10 COME T_MAX\n  DA DIM_PRODUCT\n  DOVE DIM_PRODUCT_ID != -1 -- non valore predefinito\n  E L&#039;ATTRIBUTE \u00c8 NULL ); -- conteggia gli spazi vuoti\n<\/code><\/pre>\n<p>\n<i>Sono stati utilizzati materiali del libro<br \/>\nRonald Bachmann, Dr. Guido Kemper<br \/>\nFuori dalla trappola BI<br \/>\nCome la Business Intelligence pu\u00f2 avere successo<\/i><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/459682\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0430\u0436\u043d\u043e\u0439 \u043f\u0440\u0435\u0434\u043f\u043e\u0441\u044b\u043b\u043a\u043e\u0439 \u043a \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044e \u0446\u0435\u043d\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u041f\u043b\u043e\u0445\u043e\u0435 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0432\u0435\u0434\u0451\u0442 \u043a \u043d\u0435\u0433\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u0446\u0435\u043f\u043d\u043e\u0439 \u0440\u0435\u0430\u043a\u0446\u0438\u0438 \u0432 \u0434\u043e\u043b\u0433\u043e\u0441\u0440\u043e\u0447\u043d\u043e\u0439 \u043f\u0435\u0440\u0441\u043f\u0435\u043a\u0442\u0438\u0432\u0435. \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u0442\u0435\u0440\u044f\u0435\u0442\u0441\u044f \u0434\u043e\u0432\u0435\u0440\u0438\u0435 \u043a \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u041b\u044e\u0434\u0438 \u043d\u0430\u0447\u0438\u043d\u0430\u044e\u0442 \u043c\u0435\u043d\u044c\u0448\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c Business Intelligence 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\u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36155","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0430\u0436\u043d\u043e\u0439 \u043f\u0440\u0435\u0434\u043f\u043e\u0441\u044b\u043b\u043a\u043e\u0439 \u043a \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044e \u0446\u0435\u043d\u043d\u043e\u0439 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