

{"id":59623,"date":"2019-01-08T15:48:02","date_gmt":"2019-01-08T14:48:02","guid":{"rendered":"https:\/\/www.scalefree.com\/blog\/alternative-zur-driving-key-implementierung-in-data-vault\/"},"modified":"2026-07-14T13:00:58","modified_gmt":"2026-07-14T11:00:58","slug":"alternative-zur-driving-key-implementierung-in-data-vault","status":"publish","type":"post","link":"https:\/\/www.scalefree.com\/de\/blog\/data-vault\/alternative-zur-driving-key-implementierung-in-data-vault\/","title":{"rendered":"Alternative zur Driving-Key-Implementierung in Data Vault"},"content":{"rendered":"[vc_row type=&#8220;in_container&#8220; full_screen_row_position=&#8220;middle&#8220; column_margin=&#8220;default&#8220; column_direction=&#8220;default&#8220; column_direction_tablet=&#8220;default&#8220; column_direction_phone=&#8220;default&#8220; scene_position=&#8220;center&#8220; text_color=&#8220;dark&#8220; text_align=&#8220;left&#8220; row_border_radius=&#8220;none&#8220; row_border_radius_applies=&#8220;bg&#8220; overflow=&#8220;visible&#8220; overlay_strength=&#8220;0.3&#8243; gradient_direction=&#8220;left_to_right&#8220; shape_divider_position=&#8220;bottom&#8220; bg_image_animation=&#8220;none&#8220;][vc_column column_padding=&#8220;no-extra-padding&#8220; column_padding_tablet=&#8220;inherit&#8220; column_padding_phone=&#8220;inherit&#8220; column_padding_position=&#8220;all&#8220; column_element_direction_desktop=&#8220;default&#8220; column_element_spacing=&#8220;default&#8220; desktop_text_alignment=&#8220;default&#8220; tablet_text_alignment=&#8220;default&#8220; phone_text_alignment=&#8220;default&#8220; background_color_opacity=&#8220;1&#8243; background_hover_color_opacity=&#8220;1&#8243; column_backdrop_filter=&#8220;none&#8220; column_shadow=&#8220;none&#8220; column_border_radius=&#8220;none&#8220; column_link_target=&#8220;_self&#8220; column_position=&#8220;default&#8220; gradient_direction=&#8220;left_to_right&#8220; overlay_strength=&#8220;0.3&#8243; width=&#8220;1\/1&#8243; tablet_width_inherit=&#8220;default&#8220; animation_type=&#8220;default&#8220; bg_image_animation=&#8220;none&#8220; border_type=&#8220;simple&#8220; column_border_width=&#8220;none&#8220; column_border_style=&#8220;solid&#8220;][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]\n<h2>Alternative zum Driving-Key<\/h2>\n<p><span style=\"font-weight: 400;\">Es gibt einen Spezialfall, in dem sich ein Teil der in einem Link gespeicherten Hub-Referenzen \u00e4ndern kann, ohne eine andere Beziehung zu beschreiben. Dies hat erhebliche Auswirkungen auf die Link-Satelliten. Dar\u00fcber hinaus haben wir bereits im Jahr 2017 die<\/span><span style=\"font-weight: 400;\"> <a href=\"http:\/\/blog.scalefree.com\/2017\/11\/03\/visual-data-vault-by-example-modeling-in-the-banking-industry\/\" target=\"_blank\" rel=\"noopener noreferrer\">Link-Struktur<\/a><\/span> <span style=\"font-weight: 400;\">anhand eines Beispiels f\u00fcr ein <a href=\"https:\/\/www.scalefree.com\/blog\/modeling\/visual-data-vault-by-example-modeling-in-the-banking-industry\/\">Data-Vault-Modell in der Bankenbranche<\/a> vorgestellt. Wir haben gezeigt, wie das Modell aussieht, wenn ein Link entweder eine Beziehung oder eine Transaktion zwischen zwei Business-Objekten darstellt. Ein Link kann auch mehr als zwei Hubs miteinander verbinden. Was ist die Alternative zur Driving-Key-Implementierung in <a href=\"https:\/\/www.scalefree.com\/data-vault-2-0\/\">Data Vault 2.0<\/a>?<\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;25&#8243;][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]<div class=\"content-list-wrapper\"><p class=\"content-heading\">In this article:<\/p><ul class=\"content-list\"><li><a href=\"#der-driving-key\">Der Driving-Key <\/a><li><a href=\"#fazit\">Fazit<\/a><\/ul><\/div>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;40&#8243;][vc_column_text]\n<h2><span style=\"font-weight: 400;\">Der Driving-Key <\/span><\/h2>\n[\/vc_column_text][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]<span style=\"font-weight: 400;\">Eine Beziehung oder Transaktion wird in einem Quellsystem h\u00e4ufig durch eine Kombination von Business-Keys identifiziert. In Data Vault 2.0 wird dies als normaler Link modelliert, der mehrere Hubs verbindet, die jeweils einen Business-Key enthalten. Ein Link enth\u00e4lt auch seinen eigenen <a href=\"https:\/\/www.scalefree.com\/de\/blog\/data-vault\/hash-keys-in-data-vault\/\">Hash-Key<\/a>, der \u00fcber die Kombination aller Business-Keys der Parent-Hubs berechnet wird. Wenn der Link also vier Hubs verbindet und sich ein Business-Key \u00e4ndert, weist der neue Datensatz einen neuen Link-Hash-Key auf. Ein Problem entsteht, wenn zwar vier Business-Keys die Beziehung beschreiben, aber nur drei davon diese eindeutig identifizieren. Wir k\u00f6nnen das Business-Objekt nicht allein anhand des Hash-Keys des Links identifizieren. Dies ist zwar kein Modellierungsfehler, allerdings m\u00fcssen wir bei der Datenabfrage den korrekten Datensatz im zugeh\u00f6rigen Satelliten identifizieren. In Data Vault 2.0 wird dies als Driving-Key bezeichnet. Es handelt sich dabei um einen konsistenten Schl\u00fcssel innerhalb der Beziehung, der im Quellsystem oft dem Prim\u00e4rschl\u00fcssel entspricht.        <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Die folgenden Tabellen veranschaulichen die Beziehung zwischen einem Mitarbeiter und einer Abteilung aus einem Quellsystem.<\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;30&#8243;][image_with_animation image_url=&#8220;29672&#8243; image_size=&#8220;full&#8220; animation_type=&#8220;entrance&#8220; animation=&#8220;None&#8220; animation_movement_type=&#8220;transform_y&#8220; hover_animation=&#8220;none&#8220; alignment=&#8220;center&#8220; border_radius=&#8220;none&#8220; box_shadow=&#8220;none&#8220; image_loading=&#8220;lazy-load&#8220; max_width=&#8220;100%&#8220; max_width_mobile=&#8220;default&#8220;][vc_custom_heading text=&#8220;Table 1: employee-department relationship&#8220; font_container=&#8220;tag:div|text_align:center&#8220; google_fonts=&#8220;font_family:Droid%20Serif%3Aregular%2Citalic%2C700%2C700italic|font_style:400%20regular%3A400%3Anormal&#8220;][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;15&#8243;][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]<span style=\"font-weight: 400;\">Das folgende <a href=\"https:\/\/www.scalefree.com\/data-vault-2-0\/#modeling\">Data-Vault-Modell<\/a> l\u00e4sst sich aus dieser Quellstruktur ableiten. <\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;40&#8243;][image_with_animation image_url=&#8220;29675&#8243; image_size=&#8220;full&#8220; animation_type=&#8220;entrance&#8220; animation=&#8220;None&#8220; animation_movement_type=&#8220;transform_y&#8220; hover_animation=&#8220;none&#8220; alignment=&#8220;center&#8220; border_radius=&#8220;none&#8220; box_shadow=&#8220;none&#8220; image_loading=&#8220;lazy-load&#8220; max_width=&#8220;100%&#8220; max_width_mobile=&#8220;default&#8220;][vc_custom_heading text=&#8220;Figure 1: Data Vault model&#8220; font_container=&#8220;tag:div|text_align:center&#8220; google_fonts=&#8220;font_family:Droid%20Serif%3Aregular%2Citalic%2C700%2C700italic|font_style:400%20regular%3A400%3Anormal&#8220;][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;20&#8243;][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]<span style=\"font-weight: 400;\">Die Link-Tabelle \u201eEmpl_Dep\u201c wird aus der Tabelle \u201eEmployee\u201c im Quellsystem abgeleitet. Der Driving-Key in diesem Beispiel ist die Employee_Number, da sie der Prim\u00e4rschl\u00fcssel in der Quelltabelle ist und ein Mitarbeiter zur gleichen Zeit nur in einer Abteilung arbeiten kann. Das bedeutet, dass der tats\u00e4chliche Driving-Key im Satelliten des Mitarbeiters \u201elebt\u201c. Wechselt die Abteilung eines Mitarbeiters, entsteht kein zus\u00e4tzlicher Datensatz in der Satellitentabelle des Mitarbeiters, sondern ein neuer in der Link-Tabelle, was v\u00f6llig legitim ist.   <\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;40&#8243;][image_with_animation image_url=&#8220;29674&#8243; image_size=&#8220;full&#8220; animation_type=&#8220;entrance&#8220; animation=&#8220;None&#8220; animation_movement_type=&#8220;transform_y&#8220; hover_animation=&#8220;none&#8220; alignment=&#8220;center&#8220; border_radius=&#8220;none&#8220; box_shadow=&#8220;none&#8220; image_loading=&#8220;lazy-load&#8220; max_width=&#8220;100%&#8220; max_width_mobile=&#8220;default&#8220;][vc_custom_heading text=&#8220;Table 2: link data&#8220; font_container=&#8220;tag:div|text_align:center&#8220; google_fonts=&#8220;font_family:Droid%20Serif%3Aregular%2Citalic%2C700%2C700italic|font_style:400%20regular%3A400%3Anormal&#8220;][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;15&#8243;][vc_column_text css=&#8220;&#8220; text_direction=&#8220;default&#8220;]<span style=\"font-weight: 400;\">Um das aktuellste Delta zu ermitteln, m\u00fcssen Sie dieses aus der Link-Tabelle abfragen und nach dem Driving-Key gruppieren.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Zusammenfassend l\u00e4sst sich sagen, dass Sie immer einen neuen Link-Hash-Key erhalten, wenn sich ein Business-Key in einer Beziehung \u00e4ndert. Die Herausforderung besteht darin, den Driving-Key zu identifizieren. Hierbei handelt es sich um einen eindeutigen Business-Key (oder eine Kombination von Business-Keys) f\u00fcr die Beziehung zwischen den verbundenen Hubs. Manchmal m\u00fcssen Sie ein zus\u00e4tzliches Attribut hinzuf\u00fcgen, um einen eindeutigen Identifikator zu erhalten.   <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Beides stellt ein Problem f\u00fcr Power-User mit Zugriff auf das Data-Vault-Modell dar. Ohne klare Namenskonventionen besteht das Risiko, dass eine GROUP-BY-Anweisung auf mehr Attribute als nur den Driving-Key angewendet wird. Dies w\u00fcrde zu unerwarteten und fehlerhaften Aggregatwerten f\u00fchren, obwohl die Daten selbst korrekt modelliert sind <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Beim Umgang mit Beziehungsdaten<\/span> <span style=\"font-weight: 400;\">gibt es eine bessere L\u00f6sung als den Driving-Key: Wir bevorzugen es in der Regel, solche Daten als <a href=\"https:\/\/www.scalefree.com\/de\/blog\/datenmodellierung\/der-wert-von-non-historized-links\/\">Non-Historized-Link<\/a> zu modellieren und technische Gegenbuchungen (Counter-Transactions) in die Daten einzuf\u00fcgen, sobald sich eine Hub-Referenz \u00e4ndert.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Im Falle eines ge\u00e4nderten Datensatzes in der Quelle f\u00fcgen wir zwei Datens\u00e4tze in den Non-Historized-Link ein: einen f\u00fcr die neue Version des ge\u00e4nderten Quell-Datensatzes und einen f\u00fcr die alte Version, die noch im Target existiert, aber nun ausgeglichen werden muss \u2013 den technischen Counter-Datensatz. Um die Datens\u00e4tze aus der Quelle von den Counter-Transactions zu unterscheiden, wird eine neue Spalte eingef\u00fchrt, die oft als \u201eCounter\u201c bezeichnet wird.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Der Standardwert f\u00fcr dieses Counter-Attribut ist 1 f\u00fcr Datens\u00e4tze aus der Quelle und -1 f\u00fcr die technischen Counter-Transactions. Wichtig: Wir f\u00fchren keine UPDATE-Anweisungen aus, sondern f\u00fcgen stattdessen nur neue Datens\u00e4tze hinzu. Wenn Sie die Measures aus dem Link abfragen, multiplizieren Sie diese einfach mit dem Counter-Wert.   <\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;50&#8243;][image_with_animation image_url=&#8220;29673&#8243; image_size=&#8220;full&#8220; animation_type=&#8220;entrance&#8220; animation=&#8220;None&#8220; animation_movement_type=&#8220;transform_y&#8220; hover_animation=&#8220;none&#8220; alignment=&#8220;center&#8220; border_radius=&#8220;none&#8220; box_shadow=&#8220;none&#8220; image_loading=&#8220;lazy-load&#8220; max_width=&#8220;100%&#8220; max_width_mobile=&#8220;default&#8220;][vc_custom_heading text=&#8220;Table 3: LinkConnection with counter attribute&#8220; font_container=&#8220;tag:div|text_align:center&#8220; google_fonts=&#8220;font_family:Droid%20Serif%3Aregular%2Citalic%2C700%2C700italic|font_style:400%20regular%3A400%3Anormal&#8220;][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;20&#8243;][vc_column_text]<span style=\"font-weight: 400;\">Tabelle 3 zeigt einen Link mit einem Counter-Attribut. Wenn sich ein Datensatz im Quellsystem \u00e4ndert, wird er mit dem urspr\u00fcnglichen Wert und einem Counter-Wert von -1 in die Link-Tabelle des Data-Warehouses eingef\u00fcgt. F\u00fcr den ge\u00e4nderten Wert gibt es einen neuen Link-Hash-Key, der ebenfalls \u00fcber das beschreibende Attribut \u201eSalary\u201c berechnet wird. Der Counter-Wert des neuen Datensatzes ist 1.   <\/span>[\/vc_column_text][divider line_type=&#8220;No Line&#8220; custom_height=&#8220;50&#8243;][vc_column_text]\n<h2><span style=\"font-weight: 400;\">Fazit<\/span><\/h2>\n[\/vc_column_text][vc_column_text]<span style=\"font-weight: 400;\">Da die Identifizierung des Driving-Keys einer Beziehung in manchen Situationen ein Problem darstellen kann, k\u00f6nnen Sie eine alternative L\u00f6sung nutzen, um den Driving-Key zu vermeiden. Alle \u00c4nderungen und L\u00f6schungen werden mithilfe eines Counter-Attributs in der Non-Historized-Link-Tabelle nachverfolgt. Diese speichert auch die beschreibenden Attribute, und der Link-Hash-Key wird \u00fcber alle Attribute berechnet.   <\/span>[\/vc_column_text][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"<p>[vc_row type=&#8220;in_container&#8220; full_screen_row_position=&#8220;middle&#8220; column_margin=&#8220;default&#8220; column_direction=&#8220;default&#8220; column_direction_tablet=&#8220;default&#8220; column_direction_phone=&#8220;default&#8220; scene_position=&#8220;center&#8220; text_color=&#8220;dark&#8220; text_align=&#8220;left&#8220; row_border_radius=&#8220;none&#8220; row_border_radius_applies=&#8220;bg&#8220; overflow=&#8220;visible&#8220; overlay_strength=&#8220;0.3&#8243; gradient_direction=&#8220;left_to_right&#8220; shape_divider_position=&#8220;bottom&#8220; bg_image_animation=&#8220;none&#8220;][vc_column column_padding=&#8220;no-extra-padding&#8220; column_padding_tablet=&#8220;inherit&#8220; column_padding_phone=&#8220;inherit&#8220; column_padding_position=&#8220;all&#8220; column_element_direction_desktop=&#8220;default&#8220; column_element_spacing=&#8220;default&#8220; desktop_text_alignment=&#8220;default&#8220; tablet_text_alignment=&#8220;default&#8220; phone_text_alignment=&#8220;default&#8220; background_color_opacity=&#8220;1&#8243; background_hover_color_opacity=&#8220;1&#8243; column_backdrop_filter=&#8220;none&#8220; column_shadow=&#8220;none&#8220;&#8230;<\/p>\n","protected":false},"author":91,"featured_media":59624,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3948],"tags":[],"class_list":["post-59623","post","type-post","status-publish","format-standard","has-post-thumbnail","category-data-vault"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Es gibt einen Spezialfall, in dem sich ein Teil der in einem Link gespeicherten Hub-Referenzen \u00e4ndern kann. 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