Tagged Questions

On-Line Analytical Processing, a class of systems designed for fast calculation, reporting and analysis of aggregate figures.

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2
votes
0answers
18 views

Wich is the most efficient/easy way for end-user to get data from Analysis database?

I know that you can quey a cube by connecting from excel to Analysis database and using formulas like cubevalue() or cubemember(). I also know that after converting the power pivot to formulas you can ...
0
votes
1answer
21 views

which type of database to choose for OLAP applications? [closed]

The main classification of databases are below(not sure if there are more). Relational DBMS Object Oriented DBMS Object-Relational DBMS Non Relational DBMS I want to choose a DBMS for my OLAP ...
2
votes
0answers
77 views

How to insert values into Bridge Table in star schema?

I am modelling my database with respect to star schema with bridge tables. My master Table looks like below. I need to convert this format to star schema. MasterTable StudentNumber | Subject1 | ...
0
votes
1answer
38 views

Combining data of multiple rows in view

I have a table that holds timetracking data of users and looks somewhat like this: projectid activityid worklocationid year week day hours 1 22 21 2014 37 ...
3
votes
2answers
882 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 ...
0
votes
1answer
42 views

Best open source DB technology to store and query large, sparse matrices [closed]

I have a large vector space model, in which each point is a multi-variate observation. In other words, I have a large number of pretty large records, mostly of ints and floats. I started with ...
2
votes
2answers
85 views

Are indexes unnecessary for columnar database?

In a columnar database, are indexes unnecessary or useless?
0
votes
1answer
143 views

date dimension OLAP cube design

I have a sales reporting system with incoming data like this date,editionID,outletId,Measure1,Measure2 2013-01-01,2,532,11,24 etc... I am new to designing data cubes (for the pentaho BI suite) and ...
2
votes
1answer
292 views

Dealing with measure groups of different granularity

Let's say I have a simple data warehouse with the following fact tables: FactPurchase: one row per property purchased, with purchase amount, value, etc. FactMonthlyStatus: one row per property, per ...
0
votes
0answers
21 views

Many people, one event, multiple factors - OLAP

Have a modeling problem here... first the back-story... We deal with accident data on our project, 1 vehicle-crash can have multiple people and vehicles involved, and many associated factors across ...
0
votes
1answer
502 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 ...
1
vote
1answer
810 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 ...
1
vote
0answers
135 views

Need to write MDX for time dimension in Mondrian

This is my Dimesion and Measure: <Dimension type="TimeDimension" foreignKey="ReqDateKey" name="Date"> <Hierarchy name="YQMD" hasAll="true" allMemberName="All Dates" ...
2
votes
0answers
166 views

Geographic Hierarchies in a OLAP Cube / Data Warehouse

Are the following geographic hierarchies correct? Do any US/Canadian area codes cross state/province lines? Do any US/Canadian counties cross state/province lines? Are there countries with counties ...
2
votes
2answers
967 views

Transferring Data from OLTP to OLAP databases

Systems that have both OLTP and OLAP databases periodically move data from the OLTP database to the OLAP database, so that reports can be generated based on the OLAP database. What's the official ...
10
votes
3answers
523 views

Is backing a website by a SQL Server 2012 OLAP cube considered reasonable?

I have been tasked with architecting a solution for a large retail chain. They want to allow each of its 1.2 million customers to log on to a web site to see the distribution of recent purchases ...
4
votes
1answer
259 views

How to handle “many columns” in OLAP RDBMS

I have a fact that has around 1K different numerical attributes (i.e. columns). I would like to store this in to a column-oriented DB and perform cube analysis on it. I tried to design a star ...
3
votes
1answer
230 views

Should I snowflake or duplicate it across my facts?

I'm building up a data warehouse to be used by SSAS to create cubes on, and I'm debating between two possible schemas. In my warehouse, I've got two different fact tables that tracking daily changes ...
6
votes
2answers
492 views

SSIS Validation slow. OLTP OLAP running on same server

I have four identical servers 2 are used in production and the other two are demo machines/emergency fail over boxes. The more powerful machine a 16 core 127 gigs of Ram hosts both our Datawarehouse ...
0
votes
1answer
116 views

Is it possible to drop data from OLAP database (and to keep definitions)?

[SQL Server Analysis Services from MS SQL Server 2008 R2 Standard] Our OLAP DB takes data from OLTP DB. We want to make some changes to its structure and to do this - it would be helpful if we could ...
1
vote
0answers
68 views

How to calculate run-off triangles?

(Note: This is copy of my question on StackOverflow here.) Reality description: We do have a list of projects. In every project there is a lot of accounts. You can do a lot of actions on every ...
0
votes
1answer
235 views

Storing 5TB web server access log vs OLAP DB

We have over 5TB compressed web server log in a HDFS and we often analyse using Hadoop. It is painful to run map reduce on 5TB of data and most importantly, not many developer are familiar with it. ...
4
votes
1answer
597 views

How do I display subtotals in cube browser in SSAS 2012 (Sql Server Data Tools)?

Apparently this feature was available in previous versions but has now been removed. What are some alternatives?
2
votes
0answers
199 views

Semi-additive measures for other dimensions

I am looking for a way to do semi-additive aggregations on a non-time dimension. The model I am working with is similar to a snapshot inventory warehouse. Specifically I am analyzing processes ...
1
vote
0answers
161 views

ETL import more dimensions from only 1 column

I was requested at work to learn ETL. I have already created a database without using ETL with some dimensions and consolidations, etc, containing above 1 billion numerical values. Now I have to ...
1
vote
3answers
711 views

Oracle OLAP option

I'm considering giving a try to the Oracle OLAP option. Can anyone share their experiences with it? I didn't find much discussion/blog activity on the subject. In particular, I'm interested in ...
1
vote
1answer
558 views

SSAS Modelling - many to many with one dimension

I'm having bit of a hard time modelling an OLAP cube. My analogy is this: I have a list of students. Each one has one Major subject of study, and zero or more minors, up to five in total. The raw ...
3
votes
3answers
427 views

Handling attributes that are time-variant in a Datamart

I have looked through the entire list of sites, and this is I think the best match. This is not really about database administration, more like database design. Please excuse me and point me to the ...
8
votes
3answers
825 views

What advantages does in-memory OLAP have over traditional systems with significant memory?

Do in-memory OLAP engines have advantages over the traditional OLAP engines backed by enough RAM to contain the entire cube(s)? For example, if I use a MOLAP engine (SSAS) and GB / TB of RAM where ...
3
votes
1answer
199 views

Connect tables in a cube based on historical data

So this may be the wrong place, and may seem pretty basic, but I'm new to building up cubes, so please forgive me. Imagine a setup described by the following: CREATE TABLE [dbo].[Orders] ( ...
5
votes
1answer
220 views

How to report on sparse areas of sparse fact table

A source system tracks student attendance for a school district by reporting absence events. Attendance on any particular day can be determined by examining three datasets: school calendar, student ...
6
votes
1answer
1k views

Medians, Modes, Percentiles and OLAP

I'm newbie trying to wrap my head around OLAP, and I have a few questions. Question 1: Can an OLAP cube store medians, modes, percentiles? Question 2: Can an user-written MDX query return a summary ...
2
votes
3answers
1k views

How does an OLAP cube database differ from an RDBMS?

Is a cube database, simply an RDBMS—such as PostgreSQL or MySQL—configured for OLAP via a star or snowflake schema? Or is a cube database different from an RDBMS, and if so how?
2
votes
2answers
295 views

OLAP Cube Database - need a to find a consultant / alternative to cognos express

I have a client that has about 10 staff. They want to add business intelligence services to an existing mysql relational database. It is a database containing purchasing and readership data for ...
1
vote
1answer
861 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 ...
3
votes
2answers
527 views

Combining retail sales and payment OLAP cubes

I'm using SQL Server 2005 Standard Edition Analysis Services (SSAS). I'm trying to build cubes from a retail OLTP database that can answer these kinds of questions: List down all products that were ...