Data warehouse : Order Management
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1
ORDER MANAGEMENT
Chapter 5
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Agenda
� Introduction to Order Management
� Order Transactions
2
� Order Transactions
� Invoice Transactions
� Accumulating Snapshot for the Order Fulfillment Pipeline
� Fact Table Comparison
� Implementing
� In the Real World� In the Real World
� Techniques
� Summary
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Introduction to Order Management
� Order management comprised of a series of
business process
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business process
� A subset of the data warehouse bus matrix
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Order Transactions4 Order Transactions
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Order Transactions
� The natural granularity for an order transaction fact
table is one row for each line item on an order.
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table is one row for each line item on an order.
� Example of result schema
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Order Transactions
� Fact Normalization
� Dimension Role-Playing
6
� Dimension Role-Playing
� Product Dimension Revisited
� Customer Ship-To Dimension
� Deal Dimension
� Degenerate Dimension for Order Number
� Junk Dimensions� Junk Dimensions
� Multiple Currencies
� Header and Line Item Facts with Different Granularity
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Fact Normalization
� Fact Normalization : A single, generic fact amount,
along with a dimension that identifies the type of
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along with a dimension that identifies the type of
fact
� Use Fact Normalization when
� Set of facts is sparsely populated for a given fact row.
� No computations are made between facts.
We generally resist the urge to further normalize � We generally resist the urge to further normalize
the fact table
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Dimension Role-Playing
� Role-Playing : occurs when a single dimension
simultaneously appears several times in the same
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simultaneously appears several times in the same
fact table.
� Date dimension is found in every fact table because
we are always looking at performance over time.
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Dimension Role-Playing
� Example of Role-playing
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Time Time
Request
Date
Request
Date
Order
Date
Order
Date
Assembly
Date
Assembly
Date
Time Dimension
Time Dimension
Ship
Date
Ship
Date
Arrival
Date
Arrival
Date
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Product Dimension Revisited
� Product dimension describes the complete portfolio of products sold by a company.
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products sold by a company.
� Characteristics of Product dimension
1. Numerous verbose descriptive columns.
2. One or more attribute hierarchies in addition to many nonhierarchical attributes.
3. Add readable text strings to augment or replace numeric codes in the operational product master.codes in the operational product master.
4. Quality assure all the text strings to ensure that there are no misspellings, impossible values, or cosmetically different versions of the same attribute.
5. Document the product attribute definitions, interpretations, and origins in the data warehouse’s metadata.
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Customer Ship-To Dimension
� The customer ship-to dimension contains one row for
each discrete location to which we ship a product.
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each discrete location to which we ship a product.
� Common hierarchy is natural geographic,
customer’s organizational.
Country
Region
Bill’s number
Customer NameRegion
Province
Address
Customer Name
Customer Organization Name
Customer Corporate Parent Name
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Customer Ship-To Dimension
� Factors must be taken into consideration:
1. The one-to-one or many-to-one relationship may turn
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1. The one-to-one or many-to-one relationship may turn
out to be a many-to-many relationship.
2. If the relationship between sales rep and customer
ship-to varies over time then the combined dimension
is in reality some kind of fact table itself!
3. If the sales rep and customer ship-to dimensions 3. If the sales rep and customer ship-to dimensions
participate independently in other business process
fact tables, we’d likely keep the dimensions separate.
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Customer Ship-To Dimension
� Example of Customer Ship-To Dimension
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Deal Dimension
� Deal dimension describes the incentives that have
been offered to the customer that theoretically
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been offered to the customer that theoretically
affect the customers’ desire to purchase products.
� Deal dimension describes
� the full combination of terms
� Allowance
Incentives� Incentives
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Deal Dimension
� Deal Dimension Design
1. If the terms, allowances, and incentives are
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1. If the terms, allowances, and incentives are correlated, then package them into a single deal dimension.
2. If the terms, allowances, and incentives are quite uncorrelated, then split such a deal dimension into its separate components.
3. In a very large fact table, the desire to reduce the 3. In a very large fact table, the desire to reduce the number of keys in the fact table composite key would favor keeping the deal dimension as a single dimension.
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Deal Dimension
� Example of Deal Dimension
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Degenerate Dimension
for Order Number
� Degenerate dimensions typically are reserved for
operational transaction identifiers.
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operational transaction identifiers.
� Each line item row in the orders fact table includes
the order number as a degenerate dimension.
� Useful of Degenerate Dimension for Order Number
� allows us to group the separate line items on the order.
� enables us to answer such questions as the average
number of line items on an order.
� is used occasionally to link the data warehouse back to
the operational world.
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Junk Dimension
� Why have junk dimension
� Leave flags and indicators unchanged in the fact table
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� Leave flags and indicators unchanged in the fact table
row
� Make each flag, indicator into its own separate
dimension.
� Strip out all the flags and indicators from the design.
� A junk dimension is a convenient grouping of � A junk dimension is a convenient grouping of
typically low-cardinality flags and indicators.
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Junk Dimension
� Sample rows of an order indicator junk dimension
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Multiple Currencies
� Multiple Currencies : Expressed in both local
currency and the standardized corporate currency.
20
currency and the standardized corporate currency.
� The conversion rate table contains all combinations
of effective currency exchange rates going in both
directions.
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Multiple Currencies
� Track multiple currencies with a daily currency
exchange fact table.
21
exchange fact table.
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Header and Line Item Facts with
Different Granularity
� Shouldn’t mix fact granularities (for example, order and order line facts) within a single fact table.
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and order line facts) within a single fact table.
� Allocating header facts to the line item.
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Invoice Transactions23 Invoice Transactions
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Invoice Transactions
� Occurs when products are shipped from our facility
to the customer
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to the customer
� Each items corresponding to a product being
shipped
� Various prices, discounts, and allowances are
associated with each line item
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Invoice Transactions25
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Invoice Transactions
� From invoice fact table we can see …
� All company’s products
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� All company’s products
� All customers
� All contract and deals
� All off-invoice discounts and allowances
� All revenue
All variable and fixed costs (manufacturing, delivering)� All variable and fixed costs (manufacturing, delivering)
� All money left over after delivery of product
� Customer satisfaction metrics
The optimal place to start a DW
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Accumulating Snapshot27
for the Order Fulfillment Pipeline
Accumulating Snapshot
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Accumulating Snapshot for
the Order Fulfillment Pipeline
� Useful when we want to better understand how
quickly products move through pipeline
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quickly products move through pipeline
Order Fulfillment Pipeline Diagram
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Accumulating Snapshot for
the Order Fulfillment Pipeline29
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Accumulating Snapshot for
the Order Fulfillment Pipeline30
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Accumulating Snapshot for
the Order Fulfillment Pipeline
� Typically have multiple dates representing major
milestones of the process
31
milestones of the process
� Useful when the products moving through the
pipeline is uniquely identified
� Electronics equipment with a serial number
� Automobile with a vehicle ID number
Fits most naturally with short-lived processes� Fits most naturally with short-lived processes
� Lag calculations
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Fact Table Comparison32 Fact Table Comparison
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Fact Table Comparison33
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Designing Real-Time Partitions34 Designing Real-Time Partitions
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Designing Real-Time Partitions
� DW extend its existing historical time series
seamlessly to the current instant
35
seamlessly to the current instant
� Separated physically and administratively from the
conventional static DW tables
� Requirements
� Contain all the activity occurred since the last update
� Link as seamlessly as possible to the grain and content
� Be so lightly indexed that incoming data can be
continuously dribbled in
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Implementing36 Implementing
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Business Process37
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Business Process (�!�)38
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Fact Table39
� Invoice Fact
Order Fact� Order Fact
� Order Fulfillment Accumulating Fact
� Order Line Item Fact
� Parts Ordering Fact
� Conversion Fact� Conversion Fact
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Cube40
� Invoice
Order� Order
� Order Line Item
� Parts Ordering
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In the Real World41 In the Real World
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DELL Data Warehouse42
� DELL Data Warehouse(DDW) is a global information management system that stores data pulled directly from Dell’s Regional Order Management and Service management system that stores data pulled directly from Dell’s Regional Order Management and Service Systems.� Order Data is available for the US, Latin America, Canada,
Europe, Asia Pacific and Japan. It’s upload daily with the previous day’s activity.
� of the order in the order lifecycle. The DW provides information for all order statuses and order types to the item level.information for all order statuses and order types to the item level.
� Order Status indicates the position
� Order Type indicates how revenue and cost associated with the order will be treated for accounting purposes.
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Dell – Lifecycle of an Order43
� Every order at Dell goes through the following
stages shown below :stages shown below :
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Techniques44 Techniques
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Summary54 Summary
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Summary
� Context of the order management process
Dimension role-playing
55
� Dimension role-playing
� Multiple currencies
� Common challenges in modeling orders data
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Summary
� Facts at different levels if granularity
Set of facts associated with invoice transactions
56
� Set of facts associated with invoice transactions
� Power of accumulating snapshot fact tables
� Differences between the three fundamental types
of fact tables
� Designing Real-Time Partitions� Designing Real-Time Partitions
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