Questions tagged [data-warehouse]

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

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136 views

Which DB for 1 table with 100 Million rows per year? [closed]

I've a questionnaire with 70 questions and need to store the answers. Problem: it's 100 Million records per year. I've experience with different types of storages, but never had to deal with these ...
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251 views

What is the best option for High availability on a data warehouse?

I have a customer who have an existing 1.5Tb data warehouse and are currently planning for a complete refresh of the DW on a new environment. Their infrastructure manager has organised 2 servers with ...
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35 views

Dimension attribute with one-to-many relationship

I have a request for an attribute in a dimension that has a one-to-many relationship with the lower level of the dimension. Here is the case: Dimension: Employee Attribute: Immatriculation I have ...
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27 views

Aggregating Multiple COTS Databases into a Data Warehouse or similar for Reporting

I am sure this is a very basic question, so I apologize, but I've read lots of articles and done a lot of google searches and have not found any leads for this particular challenge I am looking to ...
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32 views

How do you partition an events table by a time based off the datediff(Lag,time)?

I am not sure how really to ask this question as i have never come across such grouping/ partitioning before. Basically i have an events table with 50 million rows that give me a timestamp, user, ...
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12 views

How to model changing OrderLine rows in fact table

In our business, we have Orders that are made up of OrderItems. Over time, these Orders can change status (e.g. Received, Challenged, Planned, Completed). During this process, the OrderItems for an ...
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8 views

Rolling up/aggregating a duration measure in OrderLine fact table

I am starting to model a datawarehouse, and would like some suggestions. We have Orders and OrderLines. I have read that it is often recommended to model this as one OrderLine fact table at the ...
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1answer
29 views

Can a factless fact table be a bridge table?

As for bridge tables, they can be a helper table both for facts and dimensions. But can the factless fact table be a bridge table?
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1answer
44 views

Why student attendance is not considered a fact in data warehousing?

In a KimballGroup example student attendance is not considered a fact. Hence it considers this example as forming factless fact table. I don't really understand what is the difference between a fact ...
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11 views

Building a data cube in a data warehouse through Inmon architecture?

I have been reading about data cubes and Kimball. Through building a star schema, one can then model a cube using its measures and dimensions of the star schema. But then there is a different data ...
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20 views

How can I filter first then show values in BI?

As my title, I'm in this trouble. When I create a BI publisher report, it's show all of value, I just can filter after that. Can someone tell me know how can I filter values before show it in BI ...
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11 views

Is there anyway to automate DQS knowledge base discovery process, using SSIS or any SQL job?

We are implementing a data warehouse for our client and part of it requires the development of metadata repository. Now, that repository, other than metadata information, would also contain domain ...
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44 views

Data Warehouse Modeling: Sales Order Charges [closed]

I have two databases systems that I'm trying to dimensional model a sales order business. Both operational data stores have a Sales Order header and detail table. However, one of them has an ...
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40 views

Dimensional Model for CRM Sales Opportunity and Sales Leads: Fact or Dimension?

I'm working for a business lender, and trying to come up with a basic dimensional model around the subject area of loan approvals. We use a CRM, (Salesforce) and one of the core objects is a (Sales) ...
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1answer
138 views

Dimensional Modeling of a Loan Approval Process and Fact Grain(s)

Context: I'm modeling for a lending company and I'm modeling our loan approval process. I have some basic dimensions relative to our business figured out: Time(day) Account Opportunity ...
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1answer
34 views

Appropriate situation to data warehouse and how to best manage the warehouse? [closed]

I have a query that is on the opening page of our application that takes about 8-10 seconds to load. I've tried all I can to optimize it and I simply cannot make it go any faster (indexed ...
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1answer
85 views

Error on Datastage when I try to write on AS400

I'm having troubles to operate an ETL process on DataStage. I have the following error log: #TABLE#,0: ODBC function "SQLExecute" reported: SQLSTATE = HY000: Native Error Code = -332: Msg = [IBM(...
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24 views

How to implement updates from mySQL operational DB to Azure SQL DB for reporting

We have an operational mySQL DB running on AWS for a transactional system and an Azure SQL DB for reporting with PowerBI. Now I'd like to regularly (e.g. every night) do an update of certain tables ...
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21 views

does a fact table always need to have a field for aggregate?

When I was studying data warehouse modeling, the first thing I came into contact with was the order fact table, and the product, user, date dimension tables. The order table will have quantity, ...
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91 views

Where to build the OLAP cubes? [closed]

I have built a data warehouse with multiple fact tables and dimension tables (with a MySQL server). Now where could I build the OLAP cubes and write the MDX queries to produce results? BTW, I have ...
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1answer
135 views

Run SQL Agent Job 3 times in a Row

How do I execute SQL Agent job 3 times in a row? We are creating Data Warehouse Project. It ETLs data from Flatfile Legacy Folder, and creates Dim and Fact tables. SSIS Project Environment Variable (...
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1answer
78 views

Do Indexes in the T-SQL Data Warehouse automatically go over and optimize into the SSAS Cube?

Do Indexes in the T-SQL Data Warehouse automatically go over and optimize into the SSAS Cube? I am reading that applying indexes, will transfer into SSAS. I thought SQL and SSAS are totally different ...
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328 views

How to handle schema changes in source systems when running an ETL?

How do people typically handle schema changes in source systems when running an ETL as part of an EDW? For example when a column you were operating on disappears and your ETL breaks.
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39 views

Compare Validate TSQL Data Warehouse to SSAS

How do I compare Data in T-SQL DataWarehouse to SSAS Cube? I would like to conduct this from SSMS (SQL Server Studio Management Studio). Example Select CustomerName from dbo.DimCustomer where ...
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1answer
62 views

Kimball Data: Modeling Data as Both Fact and Dimension with View

In Data warehousing, Kimball discusses modeling an insurance policy premium as Both Dimension and Fact. I have the following table, create table dbo.DimAutoInsurance ( DimAutoInsuranceId int ...
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40 views

SSAS Find Distinct Business Key Count for Fact Table

We have Dimension Table and Fact Table in SSAS Cube. The DimCustomer table is Slowly changing Dimension, it tells when Business Key eg: 2, Joe Smith, changes his address, phone number. Hence, a ...
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701 views

Difference Between a Staging and the Production DWH

I have a general question on a Data Warehouse Architecture. I have heard a lot of a Staging and a Production, so that data should be loaded via SSIS first into a staging dwh and then via SSIS to the ...
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36 views

How to Represent a VARCHAR Column with XML Data in a Fact Table?

I have SQL Server 2016 environment and I have decided to design a source table with holds some sort of event data as a transactional fact table. The table has about a million rows, and generates about ...
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1answer
85 views

Should I place Kimball Data Warehouse in Microsoft Columnstore Index on Premise?

Are Columnstore tables now the vendor default method for Kimball Data warehouse tables with Dim and Facts for On Premise? I know in the cloud, Microsoft automaticaly recommends Azure Data warehouses ...
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87 views

When to Disable and Recreate Indexes in Data Warehouse ETL?

We are moving data from Staging Database into Kimball Data Warehouse DB. I am hearing different ideas regarding when to disable and rebuild indexes. Stage tables are truncated every day for each new ...
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35 views

Analytics on a Microservice system

Say we got a microservice system. The system is designed to do support a companys every need, say for example a store needs inventory, accounting/economy, a website, etc, all of which in turn is ...
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66 views

All Data Transformations via SSIS

Some folks here at my current job have made the decision that all data transformations that go into our database must be done via SSIS. This means that any old code such as views, stored procedures, ...
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1answer
141 views

Datawarehouse Staging Tables: Null or Not Null

We are loading data from OLTP into Staging Tables with SSIS, then into Kimball data warehouse with ETL process. We are inquiring about staging tables, if they should have null/not null constraints. ...
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62 views

Data Warehouse: Can a Transaction Table also be a Dimension?

We have a transaction table. Not only does sales team want to analyze by CustomerId or Productid sold, but also by sales amount sold or quantities. Kimball states, a fact table here can also be a ...
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22 views

Oracle Best-Buyer-Customer is Wholesale or Retail buyer

I have data warehouse with Fact table Orders, and CustomerDimension, and TimeDimention, and BookDimension. CREATE TABLE DIM_CUSTOMER( DIMCUSTID NUMBER(6) PRIMARY KEY, CustId NUMBER(4) ...
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1answer
222 views

Best way to capture changes on OLTP for Data Warehouse: Create/Update column or CDC

What is a preferable way to move ETL data into Data Warehouse? Create/Update date on the OLTP application, or Change Data Capture (CDC)? Given the two are allowed on a system and resourcing is not ...
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44 views

Data Warehouse Kimball Interest Rate and Interest Payment Amount

I am modelling a bank account. Should interest rate be in the DimCheckingAccountId (which shows ProductDimensions, or should it be in fact table, or both). Same with another LoanAccount, should ...
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1k views

How many rows can SQL Server process in a single INSERT statement into a table?

To illustrate my question, the following is a query detecting order's id which have not been inserted in a data warehouse and inserts them: With NewOrders As ( Select OrderID From Orders ...
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416 views

Design star schema for relatonal database

I'm a newbie to data warehousing and I've been reading articles and watching videos on the principles but I'm a bit confused as to how I would take the design below and convert it into a star schema. ...
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311 views

Data Warehouse: Auto Generate Slowly Changing Dimension Code For Any Table with Dynamic Sql

Can someone code review to take OLTP/Stage data and transform it into Data Warehouse Kimball Slowly Changing Dimension Type 2? This code should be dynamic, and should be able to utilize any table as ...
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67 views

Kimball Modelling One Column Linking to Many Dimensions

We are conducting Quality inspections, Appraisals, and Ratings on furniture. Many different types of furniture exist, chairs (1), shelves (2), couches (3), table (4). The respective DimProductType is ...
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1answer
129 views

MySQL data warehouse calculate difference over years in percentage

I'm trying to create a query to calculate the percentage difference based on a time range (e.g. WHERE dim_date.year BETWEEN 2009 AND 2011) spreaded on months. My question is how to add the new ...
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496 views

Create Slowly Changing Dimension table from Repeated Data

I am receiving transaction snapshot data from a file, it contains a history of repeated data. Currently trying to find Slowly Changing Dimensions on table with [ProductId] Business Key. Many ...
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1answer
640 views

What is the difference between Federated and Decentralized Data Warehouse?

I can not find any clear definitions or explanations of any of these. Both seem decentralized. It appears that in Federated DWH, the data is distributed and not integrated into a single repository and ...
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2answers
20 views

Mapping product codes in CRM and ERP

I'm loading data into a data warehouse. Customers/transactions are coming from the ERP and from Salesforce. Product codes do not match up between the systems. Is there a standard pattern for solving ...
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1answer
61 views

Mongodb as a data ware house?

Will mongodb a good choice as a data warehouse considering following situation? We are building analytics, report generation platform for our client and a typical table growth in terms of rows will ...
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76 views

Increase frequency of updates (ETL process) to Data Warehouse

Our data warehouse is updated only once every 24 hours (at night). The ETL process takes a little over an hour to complete. I am wondering how to increase the frequency of the ETL process - so running ...
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64 views

Best Distkey and Sortkey for the tables in Redshift

I have the following tables: orders: id => primary key customer_id => store_id => order_date => datetime order_items: id => primary key order_id => FK The query I usually run ...
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1answer
331 views

SQL Server Data Warehouse stored procedure location

We are building a Kimball data warehouse. We have a Staging Database, and Final Datawarehouse. We have a stored procedure which creates the table CustomerTransaction. Where is the best location to ...
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714 views

SQL Server Stored Procedure Slowly Changing Dimension

Can someone code review this slowly changing dimension for our Kimball Data warehouse? This is Type 2 dimension. I reviewed a lot of code on the internet, however I want to use non-TSQL specific ...