{"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\/sk\/blog\/administrirovanie\/kachestvo-dannyh-v-hranilishhe","title":{"rendered":"Kvalita \u00fadajov v \u00falo\u017eisku","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Kvalita \u00fadajov v \u00falo\u017eisku je d\u00f4le\u017eitou predpokladom na z\u00edskanie cenn\u00fdch inform\u00e1ci\u00ed. Zl\u00e1 kvalita vedie k negat\u00edvnej re\u0165azovej reakcii v dlhodobom horizonte.<br \/>\nNajprv sa str\u00e1ca d\u00f4veryhodnos\u0165 poskytnut\u00fdch inform\u00e1ci\u00ed. \u013dudia za\u010d\u00ednaj\u00fa menej pou\u017e\u00edva\u0165 aplik\u00e1cie Business Intelligence, potenci\u00e1l aplik\u00e1ci\u00ed zost\u00e1va nevyu\u017eit\u00fd.<br \/>\nV d\u00f4sledku toho sa spochyb\u0148uj\u00fa \u010fal\u0161ie invest\u00edcie do analytick\u00e9ho projektu.<\/p>\n<h4>Zodpovednos\u0165 za kvalitu \u00fadajov<\/h4>\n<p>\nAspekt s\u00favisiaci s zlep\u0161ovan\u00edm kvality \u00fadajov je mimoriadne d\u00f4le\u017eit\u00fd v projektov BI. Av\u0161ak, nie je to privil\u00e9gium len technick\u00fdch odborn\u00edkov.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nNa kvalitu \u00fadajov vpl\u00fdvaj\u00fa aj tak\u00e9 aspekty, ako<\/p>\n<p><b>Korpor\u00e1tna kult\u00fara<\/b><\/p>\n<ul>\n<li>S\u00fa zamestnanci sami zainteresovan\u00ed na produkcii kvalitn\u00fdch \u00fadajov?<\/li>\n<li>Ak nie, pre\u010do? M\u00f4\u017ee tu by\u0165 konflikt z\u00e1ujmov.<\/li>\n<li>Existuj\u00fa korpor\u00e1tne pravidl\u00e1, ktor\u00e9 ur\u010duj\u00fa zodpovedn\u00fdch za kvalitu?<\/li>\n<\/ul>\n<p>\n<b>Procesy<\/b><\/p>\n<ul>\n<li>Ak\u00e9 \u00fadaje sa vytv\u00e1raj\u00fa na konci t\u00fdchto re\u0165azcov?<\/li>\n<li>M\u00f4\u017eu by\u0165 opera\u010dn\u00e9 syst\u00e9my nastaven\u00e9 tak, \u017ee je potrebn\u00e9 'vym\u00fd\u0161\u013ea\u0165', aby sa odrazila t\u00e1 alebo in\u00e1 situ\u00e1cia v realite.<\/li>\n<li>Robia opera\u010dn\u00e9 syst\u00e9my sami overenie a kontrolu \u00fadajov?<\/li>\n<\/ul>\n<p>\nZa kvalitu \u00fadajov vo v\u00fdkazn\u00edckych syst\u00e9moch s\u00fa zodpovedn\u00ed v\u0161etci v organiz\u00e1cii.<\/p>\n<h4>Defin\u00edcia a v\u00fdznam<\/h4>\n<p>\nKvalita je potvrden\u00e9 uspokojenie o\u010dak\u00e1van\u00ed z\u00e1kazn\u00edka.<\/p>\n<p>Ale kvalita \u00fadajov neobsahuje svoju defin\u00edciu. V\u017edy odr\u00e1\u017ea kontext pou\u017eitia. \u00dalo\u017eisko \u00fadajov a syst\u00e9m BI plnia in\u00e9 ciele ako opera\u010dn\u00fd syst\u00e9m, z ktor\u00e9ho s\u00fa \u00fadaje z\u00edskan\u00e9.<\/p>\n<p>Napr\u00edklad, v opera\u010dnom syst\u00e9me m\u00f4\u017ee by\u0165 atrib\u00fat z\u00e1kazn\u00edka nepovinn\u00e9 pole. V \u00falo\u017eisku m\u00f4\u017ee by\u0165 tento atrib\u00fat pou\u017eit\u00fd ako dimenzia a jeho vyplnenie je povinn\u00e9. To, naopak, zav\u00e1dza potrebu vyplni\u0165 ho hodnotami pod\u013ea predvolen\u00e9ho nastavenia.<\/p>\n<p>Po\u017eiadavky na \u00falo\u017eisko \u00fadajov sa neust\u00e1le menia a s\u00fa zvy\u010dajne vy\u0161\u0161ie ako po\u017eiadavky na opera\u010dn\u00e9 syst\u00e9my. Ale m\u00f4\u017ee to by\u0165 aj naopak, ke\u010f v \u00falo\u017eisku nie je potrebn\u00e9 uchov\u00e1va\u0165 podrobn\u00e9 inform\u00e1cie z opera\u010dn\u00e9ho syst\u00e9mu.<\/p>\n<p>Aby bolo mo\u017en\u00e9 mera\u0165 kvalitu \u00fadajov, musia by\u0165 op\u00edsan\u00e9 jeho \u0161tandardy. \u013dudia, ktor\u00ed pou\u017e\u00edvaj\u00fa inform\u00e1cie a \u010d\u00edsla vo svojej pr\u00e1ci, by mali by\u0165 zapojen\u00ed do procesu opisu. V\u00fdsledkom tohto zapojenia m\u00f4\u017ee by\u0165 pravidlo, pod\u013ea ktor\u00e9ho je mo\u017en\u00e9 jedn\u00fdm poh\u013eadom na tabu\u013eku poveda\u0165, \u010di je chyba alebo nie. Toto pravidlo je potrebn\u00e9 vypracova\u0165 vo forme skriptu\/k\u00f3du na neskor\u0161iu verifik\u00e1ciu.<\/p>\n<h4>Zlep\u0161ovanie kvality \u00fadajov<\/h4>\n<p>\nNie je mo\u017en\u00e9 vy\u010disti\u0165 a opravi\u0165 v\u0161etky hypotetick\u00e9 chyby v procese na\u010d\u00edtania \u00fadajov do \u00falo\u017eiska. Dobr\u00fa kvalitu \u00fadajov je mo\u017en\u00e9 dosiahnu\u0165 len prostredn\u00edctvom \u00fazkej spolupr\u00e1ce v\u0161etk\u00fdch \u00fa\u010dastn\u00edkov. \u013dudia, ktor\u00ed vkladaj\u00fa \u00fadaje do opera\u010dn\u00fdch syst\u00e9mov, by mali vedie\u0165, ak\u00e9 \u010dinnosti ved\u00fa k chyb\u00e1m.<\/p>\n<p>Kvalita \u00fadajov je proces. Bohu\u017eia\u013e, vo mnoh\u00fdch organiz\u00e1ci\u00e1ch neexistuje strat\u00e9gia na jej trval\u00e9 zlep\u0161ovanie. Mnoh\u00ed sa obmedzuj\u00fa len na uchov\u00e1vanie \u00fadajov a nevyu\u017e\u00edvaj\u00fa cel\u00fd potenci\u00e1l analytick\u00fdch syst\u00e9mov. Pri v\u00fdvoji d\u00e1tov\u00fdch skladov zvy\u010dajne 70-80% rozpo\u010dtu ide na realiz\u00e1ciu integr\u00e1cie \u00fadajov. Proces kontroly a zlep\u0161ovania zost\u00e1va nedotiahnut\u00fd, ak v\u00f4bec zost\u00e1va.<\/p>\n<h4>N\u00e1stroje<\/h4>\n<p>\nAplik\u00e1cia softv\u00e9rov\u00fdch n\u00e1strojov m\u00f4\u017ee pom\u00f4c\u0165 v procese automatiz\u00e1cie zlep\u0161ovania a monitorovania kvality \u00fadajov. Napr\u00edklad nimi je mo\u017en\u00e9 \u00faplne automatizova\u0165 technick\u00fa kontrolu \u0161trukt\u00far \u00falo\u017eiska: form\u00e1t pol\u00ed, pr\u00edtomnos\u0165 hodn\u00f4t predvolen\u00fdch nastaven\u00ed, s\u00falad s po\u017eiadavkami n\u00e1zvov pol\u00ed tabuliek.<\/p>\n<p>S kontrolou obsahu to m\u00f4\u017ee by\u0165 zlo\u017eitej\u0161ie. Ke\u010f\u017ee po\u017eiadavky na \u00falo\u017eisko sa menia, m\u00f4\u017ee sa zmeni\u0165 aj interpret\u00e1cia \u00fadajov. N\u00e1stroj s\u00e1m o sebe sa m\u00f4\u017ee sta\u0165 obrovsk\u00fdm projektom, ktor\u00fd potrebuje \u00fadr\u017ebu.<\/p>\n<h4>Tip<\/h4>\n<p>\nRela\u010dn\u00e9 datab\u00e1zy, v ktor\u00fdch sa obvykle navrhuj\u00fa \u00falo\u017eisk\u00e1, maj\u00fa pozoruhodn\u00fa schopnos\u0165 vytv\u00e1ra\u0165 poh\u013eady (views). Tieto je mo\u017en\u00e9 pou\u017ei\u0165 na r\u00fdchlu kontrolu \u00fadajov, ak sa poznaj\u00fa osobitosti obsahu. Ka\u017ed\u00fd pr\u00edpad zistenia chyby alebo probl\u00e9mu v \u00fadajoch je mo\u017en\u00e9 zaznamena\u0165 vo form\u00e1te dopytu do datab\u00e1zy.<\/p>\n<p>T\u00fdmto sp\u00f4sobom sa vytvor\u00ed datab\u00e1za znalost\u00ed o obsahu. Samozrejme, tak\u00e9to dopyty by mali by\u0165 r\u00fdchle. Zvy\u010dajne trv\u00e1 spr\u00e1va zobrazen\u00ed menej \u013eudsk\u00e9ho \u010dasu ako n\u00e1stroje organizovan\u00e9 v tabu\u013ek\u00e1ch. Zobrazenie je v\u017edy pripraven\u00e9 zobrazi\u0165 v\u00fdsledok kontroly.<br \/>\nV pr\u00edpade d\u00f4le\u017eit\u00fdch spr\u00e1v m\u00f4\u017ee zobrazenie obsahova\u0165 st\u013apec s adres\u00e1tom. M\u00e1 zmysel pou\u017ei\u0165 rovnak\u00e9 prostriedky BI na vykazovanie stavu kvality \u00fadajov v \u00falo\u017eisku.<\/p>\n<h4>Pr\u00edklad<\/h4>\n<p>\nDopyt je nap\u00edsan\u00fd pre datab\u00e1zu Oracle. V tomto pr\u00edklade testy vracaj\u00fa \u010d\u00edseln\u00fa hodnotu, ktor\u00fa je mo\u017en\u00e9 vhodne interpretova\u0165. Hodnoty T_MIN a T_MAX mo\u017eno regulova\u0165 \u00farove\u0148 alarmu. Pole REPORT sa kedysi pou\u017e\u00edvalo ako spr\u00e1va v komer\u010dnom ETL produkte, ktor\u00fd nevedel riadne posiela\u0165 e-maily, a preto je rpad \u201eobch\u00e1dzka\u201c.<\/p>\n<p>V pr\u00edpade ve\u013ekej tabu\u013eky je mo\u017en\u00e9 prida\u0165 napr\u00edklad AND ROWNUM &lt;= 10, t.j. ak sa nazbieralo 10 ch\u00fdb, to sta\u010d\u00ed na alarm.<\/p>\n<pre><code class=\"sql\">CREATE OR REPLACE VIEW V_QC_DIM_PRODUCT_01 AS\nSELECT\n  CASE WHEN OUTPUT&gt;=T_MIN AND OUTPUT&lt;=T_MAX\n  THEN &#039;OK&#039; ELSE &#039;ERROR&#039; END AS RESULT,\n  DESCRIPTION,\n  TABLE_NAME, \n  OUTPUT, \n  T_MIN,\n  T_MAX,\n  rpad(DESCRIPTION,60,&#039; &#039;) || rpad(OUTPUT,8,&#039; &#039;) || rpad(T_MIN,8,&#039; &#039;) || rpad(T_MAX,8,&#039; &#039;) AS REPORT\nFROM (-- Test samotn\u00fd\n  SELECT\n    &#039;DIM_PRODUCT&#039; AS TABLE_NAME,\n    &#039;Po\u010det pr\u00e1zdnych&#039; AS DESCRIPTION,\n    COUNT(*) AS OUTPUT,\n    0 AS T_MIN,\n    10 AS T_MAX\n  FROM DIM_PRODUCT\n  WHERE DIM_PRODUCT_ID != -1 -- nie predvolen\u00e1 hodnota\n  AND ATTRIBUTE IS NULL ); -- po\u010det pr\u00e1zdnych\n<\/code><\/pre>\n<p>\n<i>Vo publik\u00e1cii boli pou\u017eit\u00e9 materi\u00e1ly knihy<br \/>\nRonald Bachmann, Dr. Guido Kemper<br \/>\nPre\u010d z pasce BI<br \/>\nAko sa Business Intelligence st\u00e1va \u00faspechom<\/i><br \/>\n<br \/>Zdroj: <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 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\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u044b\u043c. \u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435, \u043f\u043e\u0434 \u0432\u043e\u043f\u0440\u043e\u0441 \u0441\u0442\u0430\u0432\u044f\u0442\u0441\u044f \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0438\u0435 \u0438\u043d\u0432\u0435\u0441\u0442\u0438\u0446\u0438\u0438 \u0432 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u0440\u043e\u0435\u043a\u0442. \u041e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u0437\u0430 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0434\u0430\u043d\u043d\u044b\u0445 \u0410\u0441\u043f\u0435\u043a\u0442, \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 5.0.5 - 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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