3. Vežbe Projektovanje i Implementacija ETL procesa. Materijalizovani pogledi
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1 3. Vežbe Projektovanje i Implementacija ETL procesa. Materijalizovani pogledi
2 Izvođači laboratorijskih vežbi Marko Knežević (kancelarija TMD 9b) Nikola Obrenović Termin konsultacija Marko Knežević: petak 15:00 TMD 9b marko.knezevic(at)uns.ac.rs Nikola Obrenović nikob(at)uns.ac.rs
3 ETL osnove Extract Transform Load Predstavlja proces koji migrira podatke iz izvornih sistema/baza/fajlova u DW bazu podataka Mora da uskladi iste podatke iz različitih sistema po tipu, ograničenjima i semantici MS SQL Server Integration Services (SSIS) MS Business Intelligence Development Studio
4 Razvoj ETL procesa Odrediti tehnologije koje će se koristiti za ekstrakciju Definisati dokaz da je migracija uspešna Definisati mesto gde se ispravljaju greške poželjno je da to bude u izvornom sistemu Arhivirati izvorne podatke - Da li potrebno? Definisati ETL plan
5 ETL plan ETL plan - specifikacija transformacija za svaki odredišni DW atribut: koji su ulazni podaci funkcija koja transformiše ulazne podatke u DW atribut Sprovesti profilisanje podataka Sprovesti analizu nedostajućih vrednosti i odrediti kako da se one nadoknade Sarađivati sa vlasnicima podataka Definisati mehanizme za inkrementalni ETL proces u okviru izvora podataka
6 ETL Plan
7 ELT proces ETL proces predstavlja skup paketa koji se izvršavaju po definisanom redosledu i/ili u paraleli ETL paket C# Procedura Postoji glavni ETL paket koji upravlja izvršavanjem svih ostalih Preporuka: jedan paket puni jednu tabelu u DW ili staging bazi Odvojeni ETL procesi, jedan za prvi load i jedan za naredne inkrementalne
8 Glavni ETL paket
9 ETL primeri Primere kopirati na lokaciju C:\MDWT_Projects Napraviti folder C:\SSIStemp
10 ELT Paket Control Flow
11 Control flow postoji samo jedan control flow po paketu sekvenca taskova najkorišćeniji tipovi taskova: Execute SQL Execute package Data flow Script Data flow task sadrži logiku transformacije podataka
12 Data Flow
13 Data Flow Jedan ili više izvora podataka - izvor podataka je prethodni control flow task Niz transformacija Jedan ili više odredišta podataka naredni control flow taskovi
14 Error Flow Alternativni data flow Izvor ili transformacija definiše koji slogovi završavaju u error flow Primeri: Neuspela konverzija podataka Podaci nezadovoljavaju specificirano ograničenje Greška u jednom redu: može da se zaustavi ceo proces da se preskoči red da se ispravi greška
15 Control i Data Flow taskovi MSDN:
16 Extract Data definisati izvor podataka SSIS podržava OLE DB i.net providere (MS ili od nekog drugog proizvođača) ako izvor podataka nema provider, najlakše je prvo eksportovati podatke u csv/txt fajlove podaci se ektrakuju neizmenjeni u staging bazu ili fajlove minimizira se opterećenje izvornog sistema
17 2 načina: Loading Data red po red: sporo bulk: svi redovi odjednom, brzo
18 Cleaning Data sastavni deo data flow taska 2 načina čišćenja podataka na nivou kolone: kroz SQL upit za load podataka (Product_SQL.dtsx) upotrebom data flow taskova (Product_SSIS.dtsx): Lookup transformacija Derived Column transformacija Union transformacija omogućava da se otkriju problemi u izvorima podataka
19 Conforming Data Usklađivanje podataka između različitih sistema: Detekcija duplikata: Fuzzy Lookup i Fuzzy Grouping transformacije Konsolidacija podataka po tipu, ograničenjima i formatu
20 Load dimenzija Implementirati surogatni ključ IDENTITY kolonom Hijerarhije se prave spajanjem tabela iz izvora ili se prave u Excelu (npr. vremenska dimenzija) Junk dimenzije se prave spajanjem tabela ili iz Excela/skripte Inkrementalni load bez SPD: Za male dimenzije truncate i ponovno punjenje update (OLE DB transformacija) insert u posebnu tabelu pa izvršiti MERGE naredbu
21 Sporo promenjive dimenzije Dodati kolone RowStartDate, RowEndDate (i RowIsCurrent) Upotreba wizzarda Slowly Changing Dimension
22 Sporo promenjive dimenzije
23 Load činjenice Odvojeni ETL paketi, jedan za prvi (bulk) load i jedan za naredne inkrementalne (Bulk) insert ili update naredbe nad tabelom činjenica Tri tipa činjenice: transakcija presek (snapshot) akumulirana
24 Transaction grain činjenica Bulk load: insert Load činjenice Inkrementalni load: update (OLE DB transformacija) ili insert u posebnu tabelu pa izvršiti MERGE naredbu Snapshot činjenica red se ažurira svakodnevno i zamrzne se na kraju perioda zahteva dve ETL transformacije Inkrementalni load: update (OLE DB transformacija) ili insert u posebnu tabelu pa izvršiti MERGE naredbu Akumulirane činjenice Ažuriranje jednog istorijskog podatka može da izazove izmenu na velikom broju redova - uglavnom je brže ponovo load-ovati (delete+insert) poslednjih n meseci
25 Load činjenice Strani surogatni ključevi se dodeljuju Lookup operacijom tokom data flow-a Ako lookup ne uspe (odluka zavisi od zahteva): preskočiti red činjenice prebaciti nevalidne redove u posebnu tabelu napraviti placeholder za dimenziju prekinuti obradu Primer: Orders_Lookups.dtsx Iako su Lookup operacije navedene serijski, SSIS ih automatski paralelizuje
26 Load činjenice Alternativni pristup dodele stranih surogatnih ključeva: SQL upiti sa spojevima tabela Koristi se OUTER JOIN da bi se pokupile sve činjenice Primer: Orders_SQL.dtsx
27 Audit dimenzija sadrži red za svaki put kada je SSIS paket sadrži informacije ko je i kada je pokrenuo paket svaka tabela u DW sadrži dva strana ključa ka Audit tabeli: jedan definiše kada je red kreiran i drugi definiše kada je poslednji put ažuriran
28 Zakasnele dimenzije: Kašnjenje napraviti novi red ukoliko je dimenzija tipa 2 i prevezati činjenice StartDate novog reda je timestamp od koga važi nova vrednost dimenzije EndDate novog reda je EndDate stagor reda Zakasnele činjenice identifikovati dimenziju u odgovarajuće vremenskom trenutku preko StartDate i EndDate kolona
29 Error Schema Skup tabela koji je namenjen da se loguju greške tokom ETL procesa Error tabele po strukturi iste sa ciljnim tabelama dimenzione šeme Smeštaju se redovi koji imaju grešku Tabele mogu biti smeštene i u obične fajlove
30 Materijalizovani pogledi SQL Server termin - indexed view Kreirati unique clustered index nad pogledom: CREATE UNIQUE CLUSTERED INDEX <ind_name> ON <table_name> (<col_name>); Samo kolona <col_name> postaje sastavni deo indeksa ali sve kolone pogleda se čuvaju u bazi Pogled se automatski ažurira kad se ažuriraju tabele Optimizator upita samostalno pronađe i koristi materijalizovane poglede
31 Kada se kreiraju materijalizovani pogledi? Tipovi aplikacija: Data marts Data warehouses OLAP stores and sources Data mining workloads. Aplikacije koje imaju sledeće funkcionalnosti: Spojevi i agregacije velikih tabela Često ponavljani kompleksni upiti Ponavljajuće agregacije nad istih skupom kolona Ponavljani spojevi istih tabela nad istim ključevima
32 Ubrzanje performansi MSDN: The represented queries varied in complexity (for example, the number of aggregate calculations, the number of tables used, or the number of predicates) and included large multi-million row tables from a real production environment.
33 Kada se NE kreiraju materijalizovani pogledi? Nad tabelama OLTP sistema gde su česta ažuriranja Automatsko održavanje materijalizovanog pogleda postaje preskupo
34 Materijalizovai pogledi Preduslovi: Pogled sme da referencira samo tabele a ne i druge poglede Sve referencirane tabele moraju biti u istoj bazi kao i pogled i imati istog vlasnika Pogled mora biti kreiran sa SCHEMABINDING opcijom, koja povezuje pogled sa šemom kojoj pripadaju tabele Korisničke funkcije koje referencira pogled takođe moraju biti kreirane sa SCHEMABINDING opcijom Tabele i funkcije u definiciji pogleda moraju biti navedene sa nazivom šeme...
2. Vežbe Prikupljanje zahteva, projektovanje dimenzionog modela, projektovanje šeme DW baze podataka
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