A database system optimised for reporting, particularly in aggregate. Often, but not always implemented using a star schema.

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Beginning Data Warehouse Design [closed]

I am beginning to develop a Data Warehouse. The data does not already exist in a relational database. Instead it will be sourced from various 3rd party vendors. The data requirements have been drawn ...
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473 views

Data Warehouse - Slowly Changing Dimensions with Many to Many Relationships

As an example, let's say I have a fact table with two dimensions and one measure FactMoney table ProjectKey int PersonKey int CashAmount money The two dimensions are defined like this: ...
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245 views

How to simplify schema for multi database / hundreds of millions of rows data set

We currently have a MySQL data set that was started about 10 years ago that aggregates a log of data, and accumulates millions of rows each month. The people that developed our system started ...
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1answer
243 views

Using N-Tier in Business Intelligence

I have read that you also can apply N-Tier for Businesss Intelligence based on these criteria: *Presentation *Functional logic *Data What is your experience when you are using N-Tier? // ...
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7 views

Data Warehouse for reporting - 6 Dimension tables,or 1 table and 6 views?

Problem: I have been asked to add a Dimension table to our data warehouse and create the ETL tasks to populate it. Lets call the table "DimInternalFault". The source table for DimInternalFault is ...
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5 views

Datavaulting polymorphic association (conditional) columns

I'm trying to implement data vault into our business but I'm stuck with the data vault model. We are having some source tables (3NF) which contain some polymorphic association (conditional) columns: ...
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1answer
8 views

Dimensional Model for inheritance in dimensions

How are dimensions typically modeled in a dimensional model if one dimension logically inherits from another dimension? For example, assume I have an Employee dimension and a Driver dimension, where ...
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60 views

Handle Duplicate entries in Fact table in Data Cube

We have been constructing data cube for our project in which we are facing a problem like 1 to many relationship in the dimension tables and making entries in fact table (duplication). ...
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22 views

ETL flow in Fact tables

I've got a simple theoretical question... If we discuss the principles, elements, design and implementation of a typical ETL flow for a dimension table then, in my understanding, (in short) I'd say ...
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49 views

Is there a way to check which views have data? Oracle 11g

I'm undergoing a cleanup process for a data mart design. However, I want to get rid of any views (in the design) which result in having 1 or less rows of data. Instead of manually going through ...
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17 views

New fact table or new dimension

I have a fact table with 2 dimensions: cohort_id date_id Each record contains the amount of active users from a specific cohort at a particular date - typical structure for the cohort analysis. ...
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44 views

Is there value in storing audit fields in a fact table?

I've always stored at least two basic housekeeping fields in all of my dimension and fact tables: DateCreated and DateModified. However, this adds two fairly wide (eight bytes each, in MS SQL) ...
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27 views

Data warehouse: Can I tell any details from Source System on delays or blocks? [closed]

I have a MS SQL Server 2012 machine that is acting as our data warehouse currently. We are having issues with long running jobs, and am curious if there is a way to get detailed historical logging on ...
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69 views

Use trigger to update SCD2 End date and IsCurrentRow flag

I'm implementing a data warehouse that has type 2 slowly changing dimensions. When a change is made to a SCD type 2 column, I need to insert a new row into the dimension for that entity and also ...
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1answer
90 views

What to do when facts change frequently in a star schema for data warehouse?

I have a Quotation Management system that I built as a CRUD web app. Over time, I realized I need to improve it so that management can have their reports. Hence I studied the Kimball method of data ...
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80 views

Fact table linked to Slowly Changing Dimension

I'm struggling to understand the best way to model a particular scenario for a data warehouse. I have a Person dimension, and a Tenancy dimension. A person could be on 0, 1 or (rarely) multiple ...
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22 views

What known strategies, if any, can I use to validate a Slowly Changing Dimension?

I have a customer dimension in our data warehouse (SSAS 2014 Multidimensional). It is set up as a Type II SCD, with just Start and End Date fields to track changes. (null end date = current). As our ...
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88 views

Data warehousing: data transfer process too slow with larger batches

I have two primary instances of SQL Server, one for OLTP and one for reporting. The data warehouse for reporting is basically a Type 2 SCD: every table has DWDateStart and DWDateEnd columns and the ...
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49 views

Physical Table being used a Temp Table in a warehosue. Any advantage?

As I stated in previous posts I've inherited a warehouse based on SQL Server framework. In my continuous review of existing components and the practices adopted by the predecessors I found something ...
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35 views

Accounting - Dimention table in mysql

I am designing a accounting and mini erp system. I use a date dimension table to track all date related data. In oracle we can have many schema for a database. so we could create each schema for ...
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63 views

Required Information to start oracle warehouse builder

I am using windows 8 64 bit . I want to install Oracle Warehouse Builder on my system. I have installed Oracle 11g and come to know that Warehouse Builder is already a part of it. But when I start ...
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142 views

How alter on infobright (BRIGHTHOUSE storage engine) actually works

I have been using infobright-3.4.1 (5.1.40) for data warehousing. I know it is outdated version but there no plan to upgrade the version currently. Even though infobright is build on mysql, the way it ...
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234 views

Calculate sum of a whole column in IBM Datastage without any grouping

I have a table in oracle with salary as one of the columns. I want to calculate the sum of this salary column. It is pretty simple in SQL sum(salary) but I have made some dimensions and facts using ...
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133 views

Problem in Incorporating filters into Data Warehouse design

While implementing a data warehouse (proof of concept) I have a requirement to incorporate a user level save-able filter on dimensions. The requirement is a proof of concept so I have the liberty to ...
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2answers
136 views

Business Logic in Data Warehouse

my question is: Should business logic be stored in the data warehouse data store? Or should it only exist in the reporting applications? To give a more concrete example: In the CRM operational ...
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0answers
74 views

Should I use conventional or computed columns for trivial metrics in a fact table?

A fact table can often have measures which are basically trivial. For example Orders.NumOrders will probably be "1" for every real record (synthetic records representing "no order" may populate this ...
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18 views

How to ensure on Oracle RAC One Node that the OWB control service is started on the active node after a planned relocate or unexpected fail-over? [duplicate]

I followed the document 'How To Install a Warehouse Builder 11g Repository on a RAC' (Doc ID 1571166.1) to set up the OWB repository (11.2.0.4) on my Oracle RAC One Node system. Because it's a RAC One ...
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37 views

Does data guard support Oracle Warehouse Builder?

Does data guard support Oracle Warehouse Builder (both 11.2.0.4)? If not, what is the procedure to setup/configure my OWB project (repository, workspace, control center service...) on the standby ...
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74 views

When there is a Type 1 and type 2 SCD in a dimension table, how are updates to the type 1 column handled after the type 2 column is updated?

Eg: ID Type1SCD Type2SCD FromDate todate 1000 100 ABC 01-JUL-2014 NULL Now, Type2SCD is updated ID Type1SCD Type2SCD FromDate todate 1000 100 ABC 01-JUL-2014 12-JUL-2014 ...
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1answer
150 views

apply cdc to existing data warehouse

I'm building an education data warehouse. I have various dimensions that i would like to track changes to i.e. DimStudent, DimClass, DimCollege, DimExamPaper etc. etc. My solution currently drops ...
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90 views

Is there better way to design SQL tables

I need to design a quick application for small warehouse. I just want to check if there is a better design approach. I am using polymorphic associations for comments tables. Business Rules If ...
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157 views

How much RAM do I need?

Let's assume a query like the following as typical: select A.`date` as `date`, count(*) as N from A as A join B as B on B.id = A.b_id join C as C on C.id = B.c_id join D as D on D.id = ...
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2answers
185 views

Daily snapshot fact table

I have a list of products per costumer. Costumers can delete or add products to their list. I want to know in each day what is the list of products (and count) by costumer. My first approach is to ...
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1answer
215 views

SQL Server 2012 for data warehouse [closed]

I have to develop a data warehouse using SQL Server 2012. I'm confused about the release I could use... Standard or Enterprise? The database server will have 16 or 32 GB of RAM and a Quad-Core CPU. ...
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0answers
11 views

How to set missing colunms as a null in datastage 9.x.x

I have a sequential file with difference length fields, I want to set missing fields value as a null when I import using datastage, (Not mean set empty fields as a null)
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0answers
20 views

Informatica vs datastage? Wich is better for a beginner? [closed]

first of all sorry for my english. Im a web developer, i want to change my career ,i want to be an etl developer. I have a good understanding of database and i have been using mssql for the past year, ...
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3answers
248 views

Is business intelligence (BI) primarily a technical project or a business project? [closed]

I am currently involved in the planning stages for a Business Intelligence (BI) project in our company. We are attempting to understand many facets of the business, and as such the technical side ...
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votes
1answer
185 views

how to being building a data warehouse [closed]

We have a ERP system that uses a DB in postgres, each table has many rows and we want to build data warehouse (data warehousing). Also we want to add BI using ETL where would begin? would use schemes ...