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

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29 views

What are the smartest companies doing nowadays for business reporting and analytics? [on hold]

We are an innovation company and we pride ourselves with disrupting industries and forward thinking. Our challenges: Find the easiest way to connect to and combine data from multiple sources that ...
1
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0answers
18 views

Best practices to segment people and attributes for advertising database

we have a database where we store people some attributes per person in the following tables: people (id, name, email, phone) people_attributes (id, person_id, attribute_name, attribute_value) ...
0
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1answer
28 views

How to keep the data warehouse synchronised with the source systems? [on hold]

I'm a DBA who is responsible for exporting data from an ERP system for Business Intelligence purposes. The data from ERP system is being sent to the data warehouse and they are used in the ETL ...
1
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1answer
44 views

Name for intermediate aggregated data [on hold]

We have raw data and aggregated data as well as sometimes multiple levels of aggregation between. Is there a name for the data in that intermediate "state" of aggregation? Just like how we have Real ...
1
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1answer
21 views

Table for actual values

I have a database where logging happens and is processed in a data-warehouse styled environment. This means there are staging cycles where the data comes in and then is processed. For a reporting ...
0
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0answers
10 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) ...
0
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0answers
10 views

SSIS OLEDB Destination- Parallel loading data in same destination table [closed]

Our ETL which was direct load was taking near an hour to complete. To increase the performance of the ETL we added a conditional split after the source and wrote a logic to divide the input rows by ...
0
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2answers
112 views

How to prevent users other than DBAs from creating database links

To begin, please keep in mind that I am a very green DBA. I have done prior research and have not really found anything too promising, or maybe it just seems that way because I am still struggling in ...
0
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1answer
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 ...
0
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0answers
39 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 ...
1
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0answers
44 views

how many fact tables do I need given I want to build an OLAP for Quotation Line Item and Purchase Order Line Item report?

My client wants a report that looks something like this on a daily basis. +---------------+-------------------------+-----------------+---------------------+-------------+ | ProductNumber | ...
0
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1answer
48 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 ...
0
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1answer
71 views

How to change a web application that now needs to become OLTP and OLAP application?

Previously, I did a simple web application for an enterprise client using PHP and MySQL. After some time, it has grown to a point where I realized after talking with people here that I need to treat ...
2
votes
2answers
100 views

Have a separate database for data warehousing?

I have built a typical web application using PHP and MySQL for enterprise usage. The MySQL database is 3NF as much as possible. However, as time goes by, the requests for the data appear to be more ...
0
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0answers
47 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 ...
5
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4answers
2k views

Datawarehouse bad practice?

In our Datawarehouse context, we have to update some record in fact tables inside our ETL. One thing we did is to create nonclustered indexes just before the heaviest queries, and drop them ...
1
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1answer
66 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 ...
0
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0answers
17 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 ...
1
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3answers
54 views

Data Warehouse measures without a corresponding dimension

I have an operations database that contains this table: salesQuality salesPrice salesCategory According to my business requirements, the salesQality and salesPrice are measures. However, ...
1
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1answer
84 views

Best way to document Dwh views [closed]

I works in a company that provide Dwh views as an API for external Customers (We use MS-SQL 2008 & 2012). every once in a while we release new views and updates the existing views. We have ...
0
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0answers
66 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 ...
0
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0answers
47 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 ...
0
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0answers
28 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 ...
3
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2answers
66 views

Is it good or bad practice to have a fact table relate to the same dimension table multiple times?

I'm new to DW/BI, and this seems like a pretty basic question, but I can't seem to find a good answer. I have a fact table that would have more than one date associated with it, so I was thinking ...
0
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0answers
45 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 ...
1
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2answers
185 views

TSQL vs SSIS Lookup

I was trying to find some well performing Tsql equivalents for the SSIS Lookup component. Especially for Fact table loading. After few different query patterns the most obv performed the best: ...
0
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0answers
86 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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3answers
569 views

Purpose of Data Warehousing?

I have been reading up on Data Warehousing and its purpose. The main purpose seems to be to track historical data and whatever changes may have occurred over time. The DW book I am reading gives a ...
0
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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 ...
1
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1answer
39 views

MySQL data to Postgres every X time

Our team (Uni students) have a project that we are updating. Old project team has a Live MySQL database. We want to make a archive/warehouse from it in PostgreSQL. My question is: How can we import ...
1
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2answers
30 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 = ...
0
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0answers
135 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 ...
0
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0answers
110 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 ...
2
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0answers
96 views

SQL Server, Mount Points and File Groups design [closed]

I am looking for some advice on a data warehouse we are building. Specifically around SQL Server, mount points and file groups. We have two design options for how mount points and files groups should ...
10
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2answers
656 views

Clustered columnstore indexes and foreign keys

I am performance tuning a data warehouse using indexes. I am fairly new to SQL Server 2014.Microsoft describes the following: "We view the clustered columnstore index as the standard for storing ...
1
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1answer
35 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 ...
2
votes
1answer
38 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 ...
0
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2answers
104 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 ...
0
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2answers
485 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 ...
5
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2answers
3k views

Is Data Warehousing possible in MySQL and PostgresSQL [closed]

I am fairly new to DB design and development. My requirement is simple drilldown/slicing based on time and language of words (in a language on a particular day). However, my db is mysql. But so far I ...
1
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2answers
124 views

How to architect an analytical BI platform? [closed]

I am working on a new BI project for a medium sized corporation. Right now there is no Analytical infrastructure in place and the reporting is done manually in Excel. There are a few different data ...
2
votes
1answer
72 views

Is data warehouse monitoring same as database monitoring? [closed]

I have a requirement, where data warehouse population is to be monitored. I am in confusion, and needed a clear picture. Is data warehouse different than database? eg. For monitoring database we ...
1
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0answers
205 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 ...
2
votes
1answer
3k views

Best approach for populating date dimension table

I am looking to populate a date dimension table in a SQL Server 2008 database. The fields in the table are as follows: [DateId] INT IDENTITY(1,1) PRIMARY KEY [DateTime] ...
2
votes
1answer
55 views

Hierarchy for dimensional model

I am trying to model a DW where I have many levels of geography (Neighborhood, District, City, State). I have several demographic data that should be included in the model. These data include count ...
0
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0answers
50 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 ...
1
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2answers
152 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 ...
1
vote
2answers
123 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 ...
0
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1answer
195 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 ...
0
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0answers
17 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 ...