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

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183 views

Designing an Accumulating Snapshot with Repeated Groups, need advise

Situation I need to create a pie chart that has to be able to be represented at the following levels: District, Region, and School. At the student level it has to show the trend of the student over ...
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1answer
919 views

Design of fact table(s) and dimensions tables for data warehouse

Hi i'm newbie in Datawarehousing, how would you model this in a Data Warehouse: i wish design the Data Warehouse which give the answers of statistics relating to a baseball league For players in ...
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1answer
59 views

How to migrate data of to another sql server

Good day, I have a database running on a virtual machine hosted at our ISP. It is a fairly large database which has about 5GB of data inserted into it every day (network logs). It is partitioned ...
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1answer
34 views

Separating system databases from MDW SQL Server 2008 R2

We have the Management Datawarehouse feature configure on two of our SQL Servers. Both point to the same central database and upload their results to it. Everything works fine with the built in ...
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1answer
34 views

Modeling Conversion Events in a Data Warehouse

How should I model conversion events? For instance, if a sales opportunity goes from "stage: prospecting" to "stage: validating", should that be treated as a changing dimension, or a conversion event ...
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2answers
138 views

Database design suggestions for a data scraping/warehouse application?

I'm looking into the database design for a data warehouse kind of project which involves a large number of inserts daily. The data archives will be further used to generate reports. I will have a ...
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3answers
292 views

Looking for ideas on maintaining data warehouse in close to real-time - ETL tools, etc

I have done a fair number of traditional data warehouse implementations where the loads were done in a batch-oriented manner, i.e. the data is refreshed nightly or, at most, every few hours. I now ...
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1answer
996 views

Fastest mechanism to move data between tables in SQL server

We are building a data warehouse. For some of our target tables, the only way to manage the process correctly is to re-transform all the data every time something changes. Currently we do this using ...
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1answer
1k views

Datawarehouse - Dimension, Fact, or Degenerative dimension

I am building a warehouse for a billing system that bills a number of services/utilities on the same invoice, as such I am having real trouble conforming to a recognised design method for the ...
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1answer
271 views

Open source tools to manage Data Quality [closed]

Are there open source (or commercial) tools that can report data quality issues in a data warehouse using the Kimball star schema model? It doesn't have to be the silver bullet. I'm just looking for ...
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2answers
22 views

Dimension for Product Properties based on Product Type - Sparse Dimension?

I am creating dimension of product properties for sales facts. Property of product depend of product type. For example: - Type = smartphone. Properties = model, OS, size - Type = book. Properties = ...
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0answers
166 views

500GB Data Warehouse - how to split it into FileGroups?

OK, so I have: 500 GB DW 5 GB in smaller DBs 220 GB TempDB 350 GB in Log files. My machine is Fujitsu Primergy 64 cores (with HT) and 192 GB RAM. I have several IO locations: 540 GB in-server ...
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2answers
80 views

Dimension or Degenerate Dimension?

I am taking a course on data warehousing. Currently, I am reading through Ralph Kimball's Data Warehouse Toolkit. I understand that a degenerate dimension is a dimension key that is stored in a fact ...
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1answer
108 views

Migrate Management Data Warehouse to a New Instance

Is there a defined procedure to follow for moving a SQL Server 2012 management data warehouse to a new server\instance? We intend to setup an MDW on a test sql server instance first, but will then ...
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0answers
133 views

Running materialized view refresh in parallel

I have a large materialized view that is refreshed periodically (complete refresh) and I would like to do it in parallel. I can already run the query part in parallel but the problem is (much slower) ...
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0answers
93 views

What type of fact table / loading solution for a reservation system?

I am designing a Data Warehouse with SQL Server 2012 and SSIS. The source system handles hotel reservations. The reservations are split between two tables, header and header line item. The ...
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1answer
378 views

creating a report on the mysql jasperReport server

I have mysql local database, in it I have sample data mart. I have installed jasperReport server to my computer. Just using this tool, I want connect to the local mysql database and just create a pdf ...
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0answers
518 views

sql server 2008 execution plan different on two production servers [closed]

We have two servers running SQL server 2008 R2, with identical databases, where we implemented a datawarehousing solution. The cube processing operation was taking a VERY long time in one of the ...
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0answers
35 views

Monoblock, Multiblock queries?

What exactly mean the terms monoblock / multiblock queries in data warehouses when talking about materialized views? Does a monoblock query just use one data source (a normal table) while a multiblock ...
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0answers
638 views

An advice to design a fact table with a scd as a dimension

I have a problem of conception and I would like to get your ideas on how I'll be able to do what I am aiming. My goal is to create a datawarehouse, with three dimensions and one fact table so far. ...
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2answers
2k views

Possible career paths for Oracle Certified Associate (OCA) [closed]

In order to be confident in databases as a entry level job candidate, I completed the OCA certification. Now I want to know what career paths follow this. Can one go into data-mining, BI, or ...
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2answers
1k views

Can a surrogate key and a primary key be in the same table?

For example we have: Surrogate key: ABC123 Primary key: 1 Name: James Is this legit in a Data Warehouse table?
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2answers
197 views

Teradata performance statistics

I need some statistics regarding the performance of Teradata, something like with a given hardware, given nodes and given AMPs - a table which has thousands of rows can be read in 't' secs. I need ...
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1answer
268 views

What are good resources on data modelling for business intelligence? [closed]

We are a SaaS startup offering purchase & procurement solutions. The data model for operational transactions has been created (relational DB). We also want to offer analytics on those transactions ...
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2answers
158 views

Query to return fields of distinct values per key

In the process of building a data warehouse we are creating some aggregation tables for a reporting engine. We would like to build a single aggregation table from the fact table that can exist as list ...
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2answers
334 views

SQL Server 2005 replication for a data warehouse

We are trying to implement some kind of Data Warehouse at my current employer. Most of our data is in a SQL Server 2005, but we might also integrate some Access databases and some databases in a SQL ...
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1answer
596 views

Benefits of using Staging Database while designing Data Warehouse [closed]

I am in process of designing a Data Warehouse Architecture. While exploring various options to Extract data from Production and putting into Data Warehouse, I came across many articles which mainly ...
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1answer
45 views

How Many Rows om Int and Big Int [closed]

How many rows does datatype int and big int retrieve in their table when you work with fact table in SQL server?
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1answer
140 views

Dimensional model or Relational model for data warehouse? [closed]

I have a pretty trivial questions in data warehouse, I know we use Dimensional data model to construct data marts and use Relational data model in staging area. What data model technique we use to ...
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1answer
4k views

SSIS convert DT_WSTR to date

I'm new to SSIS trying to covert data types. I'm pulling data from Google Analytics and loading data into a SQL 2008 database. The date column from Google analytics appears as "DT_WSTR" and the values ...
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1answer
44 views

Oracle scheduler chain priority in data warehouse applications

The scenario is as follows: We have a data warehouse type application that relies on the Oracle job scheduler and a Chain. This chain is responsible for generating materialized views (caches) that ...
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1answer
11 views

Conformed Fields or Snowflake? - Shop and Customer Location

I have shop dimension and customer dimension which both has location information. Should I create location dimension to correlate shop location and customer location? I believe this one is called ...
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2answers
205 views

How to choose suitable naming convention for Dimensional Table Column in a Data Mart?

I have done a lot of reading on naming columns for use in a data mart / data warehouse, as well as for general programming usage. For example, if I had a business branch in a normal application I ...
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1answer
60 views

Override Dimension Column Value

I have a dimension with a column called 'Type'. There is a list of default 'Types' in this dimension. However, this 'Type' column can be overriden. i.e. each user can replace the default value with ...
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1answer
66 views

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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1answer
353 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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1answer
226 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
217 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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16 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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16 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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0answers
54 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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44 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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0answers
21 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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0answers
26 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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0answers
43 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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0answers
80 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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0answers
79 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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1answer
64 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
36 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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1answer
158 views

Constellation Schema; Relationships between fact tables

What are acceptable types of depedendcies between facts in a multiple-fact schema? Conceptually talking, As you know a Multi-Dimensional Model may have multiple facts (like in a constellation ...