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

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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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0answers
152 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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2answers
1k views

Alternative to EAV for dynamic fields in a star schema data warehouse

I need to support dynamic fields and values in a big datawarehouse for storing API requests log, my user case is that I need to store all API requests query string and able to perform query against ...
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3answers
340 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 ...
1
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1answer
159 views

data warehouse design help

I'm struggling with the design phase for a data warehouse. It's not the traditional sales example you find on MSDN or all books etc. I've been tasked with creating an education data warehouse, that ...
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0answers
96 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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2answers
151 views

Using a data warehouse staging database as a source of operational data

Should you use the staging database within a data warehouse as a source of operational data? ie, is it good practice for other operational (non BI) systems to source their data from this database? ...
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1answer
1k views

How to dynamically generate rows based on value in a column

I'm attempting to write a query to denormalize some data for integrating to our data warehouse, specifically around generating some time slots. In my source system, I have table that has a start time ...
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1answer
64 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
69 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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2answers
917 views

Data Warehouse design for reporting against data for many time zones

We are trying to optimize a data warehouse design that will support reporting against data for many time zones. For example, we might have a report for a month's worth of activity (millions of rows) ...
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1answer
644 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
185 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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1answer
340 views

sql server auto statistics in data warehousing scenario

I have a relatively large data warehouse in SQL Server (200 GB). I have been experiencing really show execution times of a certain query (12 hours for a simple delete query with an inner join). After ...
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1answer
1k 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 ...
0
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1answer
46 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
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 ...
0
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2answers
160 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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2answers
254 views

avoiding unique key collisions across tables

This might be related to the idea of data warehousing, but i'm not sure, though it is extreme theory. We have a table where records get written to first, let's call it tbl_recording which looks like: ...
5
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1answer
888 views

Schema for analytics table in Postgres

We use Postgres for analytics (star schema). Every few seconds we get reports on ~500 metrics types. The simplest schema would be: timestamp metric_type value 78930890 FOO ...
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1answer
148 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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0answers
120 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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1answer
381 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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4answers
312 views

SQL Server: Database integration and synchronization

I have n SQL Server databases with the same data schema. On the other hand i have a web application that needs to retrieve, for some entities, the union of the information stored into the n ...
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2answers
886 views

Handling time zones in data mart/warehouse

We are starting to design the building blocks of a data mart/warehouse and we need to be able to support all time zones (our clients are from all over the world). From reading discussions online (and ...
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2answers
165 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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4answers
1k views

best ETL design to transfer transaction tables records into the data-warehouse

I have 2 type of tables to populate the data-warehouse with every day, lookup tables or configuration tables with few 100s records, and thats easy where i just truncate and refill the table. but for ...
2
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1answer
446 views

What database and setup can handle several million inserts per minute? [closed]

We have come to a point where for a few of our customers' systems, at peak times, events are generated at that crazy rate. That is, millions of new events per minute (between 1M and 2M). The ...
8
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3answers
681 views

Updating a big replicated Dimension (SQL Server PDW)

We use a SQL Server PDW appliance for our data warehouse. One of the tables in our warehouse is a replicated table with about 20 million rows. As part of our ETL process we need to expire old records ...
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1answer
177 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 ...
2
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0answers
198 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
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0answers
127 views

How to gracefully handle a source database restore from backup in a data warehouse

We are facing a challenging situation with our data warehouse source databases. Frequently these sources databases will be restored from backups. There is a high turnover of data entry persons who ...
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1answer
405 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 ...
4
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1answer
299 views

Where and how to store my weird datamart

I could really use some help here. Here's my situation. I'm building a datamart in SQL Server 2005, which will furnish a single report (for now). We have 26 clients (medical organizations) that ...
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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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1answer
5k 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 ...
4
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1answer
308 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 ...
0
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2answers
206 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 ...
7
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3answers
591 views

Header and line item data source mismatch

I'm working with a star schema for a data warehouse and I am running into a problem with header and line items from different data sources. CREATE TABLE DataSourceAHeader ( OrderId INT NOT NULL ...
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0answers
531 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 ...
8
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1answer
2k views

Is SQL Server data compression categorically good for read-only databases?

Some literature on SQL Server data compression I read state that the write cost increases to about four times what would normally be required. It also seems to imply that this is the primary downside ...
4
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1answer
263 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 ...
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1answer
445 views

Modeling staff dimension in data warehouse

I need to write a data warehouse diagram. I've got a problem with staff area. I have to store a information about workers details like name, age etc., and workers job time and agreement details like ...
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1answer
282 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 ...
3
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1answer
94 views

What to do with duplicate lookup information

I have multiple databases that I want to store in one data warehouse database. I am wondering how I design the import process to handle multiple lookup tables. For example, say I have 5 databases all ...
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1answer
276 views

Conceptual Design of a data warehouse (declaring the grain)

I am trying to design a data warehouse using this example scrubbed data. I need to declare the "grain". I know its the lowest level of detail in the fact table, but I am having a hard time determining ...
2
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2answers
189 views

Disaster recovery plan - Having multiple servers

I work in an organization where departments are in different buildings. I have a data centre in the main building. All the in-house applications connect to the SQL Server residing in the server in the ...
4
votes
1answer
240 views

Is there a standard way to replace codes with values from a lookup table for reporting or analytics?

Suppose I have a "main" table that was probably heavily normalized and consists largely of columns that merely contain codes that are lookups into other tables (they are probably foreign keys but feel ...
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2answers
611 views

Data warehouse support tickets

I'm starting to design a data warehouse for a company. The first questions we're trying to resolve are regarding their support ticketing system. My initial schema is as follows Now one of the ...
4
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1answer
495 views

Big Data vs Relational Database on making structure of Data-ware house for telecom data analysis [closed]

I'm currently doing my final year project on telecommunication mining. On starting project I got confuse on choosing database. As data on mobile communication is going on increasing so I think Big ...