OPERATIONEL ANALYSE AF WEBADFÆRD OAW – LEKTIONSGANG 11

OPERATIONEL ANALYSE AF WEBADFÆRD AGENDA Data warehouse / data webhouse Dimensionel modellering (Stjerne skema) Extract, Transform and load (ETL)

OPERATIONEL ANALYSE AF WEBADFÆRD WHAT IS ER FLAT DATAENTITY RELATION

OPERATIONEL ANALYSE AF WEBADFÆRD WHAT IS ER Relational database revolution bloomed in the mid 1980s. Highest form of ER modeling is to remove all redundancy in the data With hundreds or even thousands of entities we have made a database that cannot be queried! It creates the demand of a ”simpler model”

OPERATIONEL ANALYSE AF WEBADFÆRD WHAT IS DM One table with multiple keys: the fact table. This table contains only keys (integers). A set of smaller tables called dimension tables containing text information Highly recognizable to the end user. Gracefully extensible to new data elements

OPERATIONEL ANALYSE AF WEBADFÆRD ER vs DM

OPERATIONEL ANALYSE AF WEBADFÆRD HVAD ER ET DATA WAREHOUSE? Data kilde (prod) Data kilde (web) Data kilde (salg) Data warehouse Data mart (Salg) Data mart (Web) Data mining Balanced Score Cand Ad-hoc analyse Reporter Personaliserings server ….. Operationelle dataAnalytisk data Beslutningsstøtte Business Intelligence Competetive Intelligence Knowledge Discovery

OPERATIONEL ANALYSE AF WEBADFÆRD OPERATIONELLE DATA Svære at forstå (funktionel orienteret) Mange kilder (distribuerede) Opdateres og indeholder ofte ingen historik Megen data er irrelevant fra et analytisk perspektiv

OPERATIONEL ANALYSE AF WEBADFÆRD KRAV TIL ANALYTISK DATA Data skal være forståelige (Emne orienteret) Tilgængelig for alle Hurtige svartider Konsistente Interaktive og flexible Skal indeholde historik

OPERATIONEL ANALYSE AF WEBADFÆRD Eksempel på en dimentionel model (stjerne skema) click fact click_key (PK) referrer_key (FK) agent_key (FK) content_key (FK) page_key (FK) time_key (FK) day_key (FK) Campaign_key (FK) session_key (FK) number_in_session (measure) duration (measure) Referrer dimention referrer_key (PK) Domain Subdomain parameter frase keyword type Content dimention content_key (PK) content_section content_subsection content_size content_read_time_avg Day dimention day_key (PK) day_in_year week_in_year month_in_year month_name holiday weekday Campaign dimention campaign_key (PK) campaign_start_time campaign_end_time campaign_price campaign_url … KontekstFacts Med lidt god vilje… En stjerneform

OPERATIONEL ANALYSE AF WEBADFÆRD UDDYBNING, DIMENSIONSTABELLEN Tid (måned, dag, minut) Content (sektion, undersektion) Region (land, amt, kommune, by) Content dimention content_key (PK) content_section content_subsection content_size content_read_time_avg

OPERATIONEL ANALYSE AF WEBADFÆRD NAVIGATION AF DATA Operation select count(click_key) from click_fact Drill up/ drill down (group by) select count(click_key) from click_fact, content_dimention group by content_section select count(click_key) from click_fact, content_dimention group by content_subsection Slice and dice (section = udland) select count(click_key) from click_fact, content_dimention where section = ’udland’ select count(click_key) from click_fact, content_dimention, time_dimension where section = ’udland’ and year = 2002 click fact click_key (PK) referrer_key (FK) agent_key (FK) content_key (FK) page_key (FK) time_key (FK)... Content dimention content_key (PK) content_section content_subsection content_size content_read_time_avg

OPERATIONEL ANALYSE AF WEBADFÆRD EXTRACT, TRANSFORM AND LOAD Typisk udført en gang om dagen Typisk om natten, hvor virksomheden sover Men webben sover jo aldrig – hvordan håndterer vi dette i realtid? Log data er fyldt med fejl grundet ukoordineret webdesign