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Ranko Mosic

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Oracle database is a relational database management system that mostly complies with ACID transaction requirements ( atomicity, consistency, isolation, durability ). It means that each database transaction will be executed in a reliable, safe and integral manner. In order to comply with ACID Oracle database software implements fairly complex and expensive (in terms of computing resources, i.e., CPU, disk, memory) set of processes like redo and undo logging, memory latching, meta data maintenance etc. that make concurrent work possible, while maintaining data integrity. Any database transaction or even SELECT statement makes relational database systems perform tremendous amounts of work behind the scene, thus making it inherently slow and resource intensive. Oracle is trying to address scalability and performance problem in a variety of ways: - by introducing const... (more)

How to Move Your Oracle Databases to Amazon EC2 Cloud

Amazon Web Services EC2 Cloud is full scale public data center offering services that are in many aspects far ahead of ancient practices present in regular IT environments. Fast provisioning and virtually unlimited scale make old fashioned server procurement and installations look like what they are - past century's practices. This article will not deal with usual objections to cloud computing revolving around change management difficulties ( how to incorporate new environment into the existing IT infrastructure ), security, reliability, performance etc. since we think that all t... (more)

Which Cloud Service Provider Should Host Your Oracle Databases?

Big shift towards Cloud environment has started. It is now clear that this change is similar in magnitude to the shift from mainframe to client-server computing two decades ago. Amazon Web Services is the pioneer and market leader in Cloud computing space. Other vendors are playing catch up and do not come close to the breadth and scale of AWS offerings. Services and features Amazon provides are quite extensive and cover many of the enterprise-class computing needs. APIs and command line interfaces are available for each service, which makes scripting and automation achievable. ... (more)

Oracle Fusion Applications - Installation and First Impressions (Part 3)

Oracle Fusion Applications is a very complex product that relies on a number of components. One of them is Oracle Fusion Middleware for Oracle Identity Management, which in turn is built using Oracle Forms, Reports, WebLogic, HTTP server and other products. Here we are briefly describing installation of the WebLogic. Oracle Fusion Middleware components are not included in Oracle Fusion Application Media Pack - they need to be downloaded separately. Once you unpack components and start installer you will be presented with the following WebLogic welcome screen: After you provide... (more)

Oracle Fusion Applications - Installation and First Impressions (Part 6)

Oracle HTTP Server provides HTTP listener services for Oracle WebLogic. Once you download software ( it is a part of Oracle Fusion Middleware 11g Media Pack; HTTP server resides in Oracle Fusion Middleware Web Tier Utilities 11g DVD ), unzip it and run installer you will be presented with welcome screen: Installer will recognize the existing WebLogic installation: You can select components you want to get installed - we picked both HTTP server and Web cache: Here we provided HTTP component details: Here is screen that shows installation progress: This is installation complete... (more)