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Dylan's BI Notes

Syndicate content Dylan's BI Study Notes
My notes about Business Intelligence, Data Warehousing, OLAP, and Master Data Management
Updated: 7 hours 46 min ago

Do we really need semantic layer from OBIEE?

Mon, 2015-10-05 09:22
Not all BI tools have the semantic layer.  For example, Oracle Discoverer seems not having a strong semantic layer. This page summarizes what OBIEE semantic layer can do for you… BI Platform Semantic Layer I think that if these features can be accomplished in other ways and can be proven that they are not necessary, […]
Categories: BI & Warehousing

Data Lake vs. Data Warehouse

Sun, 2015-10-04 17:18
These are different concepts. Data Lake – Collect data from various sources in a central place.  The data are stored in the original form.  Big data technologies are used and thus the typical data storage is Hadoop HDFS. Data Warehouse – “Traditional” way of collecting data from various sources for reporting.  The data are consolidated […]
Categories: BI & Warehousing

Use DMZ to access BI from outside firewall

Fri, 2015-10-02 13:12
DMZ is a technology that allows you to configure your network to be accessible outside firewall. Some of users may want to access some of corporate reports from mobile or from their personal computers. While VPN and Citrix may be useful for these cases, DMZ can provide another option. A good article – OBIEE Security […]
Categories: BI & Warehousing

Lessons Learned – Data Warehouse on Cloud – Amazon Redshift

Tue, 2015-09-22 11:37
I feel that these are the rules applicable for any cloud based data warehouse solution.  In general, I feel that the on-premise data warehouse deployment probably will remain for a while. 1. For a columnar database, “select *” is bad I think that the projection needs to be done as early as possible and should […]
Categories: BI & Warehousing

Data Warehouse on Clould – Amazon Redshift

Thu, 2015-09-17 15:50
Here is a brief summary of what I learned by reading these materials. 1. The data warehouse is stored in clusters It can support scale out, not scale up. “Extend the existing data warehouse rather than adding hardware” 2. Use SQL to access the data warehouse 3. Load data from Amazon S3 (Storage Service) using […]
Categories: BI & Warehousing

OTBI Enterprise

Tue, 2015-09-15 09:39
OTBI Enterprise is the BI cloud service, a SaaS deployment of OBIA.  It is using a data warehouse based architecture.  The ETL processes are handled within the cloud.  The data are first loaded from either on premise or cloud sources using various means in the original formats.   The data are first loaded into the […]
Categories: BI & Warehousing

Is Apache Spark becoming a DBMS?

Wed, 2015-09-09 21:02
I attended a great meetup and this is the question I have after the meeting. Perhaps the intent is to make it like a DBMS, like Oracle, or even a BI platform, like OBIEE? — The task flow it actually very similar to a typical database profiling and data analysis job. 1. Define your question […]
Categories: BI & Warehousing

Schema On Demand and Extensibility

Fri, 2015-09-04 00:44
Today I see a quite impressive demo in the Global Big Data Conference. AtScale provides a BI metadata tool for data stored in Hadoop. At first, I thought that this is just another BI tool that access Hadoop via Hive like what we have in OBIEE.  I heard that that the SQL performance for BI […]
Categories: BI & Warehousing

Using Data Relationship Management to Maintain Hierarchies for BI Apps (1)

Wed, 2015-09-02 10:52
DRM is a generic data management application. It provides a web based application that allows the deploying company to maintain the data. It is a collaboration tool that allows you to define the validation and set up the data security duties and share the maintenance. Earlier the tool was designed to maintain the account information.  However, […]
Categories: BI & Warehousing

ODI Agent

Thu, 2015-07-16 18:55
An ODI agent is a process running for performing the data integration jobs. The data integration jobs are ODI scenarios in ODI.   Each scenario can be regarded as an executable program. However, we do not run those ODI scenarios directly.  These jobs are executed by the ODI agent. – An ODI agent is a Java program.  It connects to […]
Categories: BI & Warehousing