Category: Education

Feed: Striving for Optimal Performance. In this short post I would like to point out a non-obvious issue that one of my customers recently hit. On the one hand, it’s a typical case where the query optimizer generates a different (suboptimal) execution plan even though nothing relevant (of course, at first sight only) was changed. On the other hand, in this case after some time the query optimizer automatically gets back to the original (optimal) execution plan. Let’s have a look at the issue with the help of a test case… The test case is based on a range partitioned ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. Is your organization prepared for the next paradigm of customer experience? Or will you be left behind? This practical book will make you a winner in a market driven by experience and enable you to develop desirable offerings and standout service and attract loyal customers. Author Simon Clatworthy shows you how to transform into an organization that aligns your customers’ experiential journey with platforms, organizational structures, and strategic alliances. Rather than treat customer experience as an add-on to product and service design, you’ll discover how experience-centricity can drive the whole ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. Design a complete Voice over IP (VoIP) or traditional PBX system with Asterisk, even if you have only basic telecommunications knowledge. This bestselling guide makes it easy with a detailed roadmap that shows you how to install and configure this open source software, whether you’re upgrading your existing phone system or starting from scratch. Ideal for Linux administrators, developers, and power users, this updated fifth edition shows you how to set up VoIP-based private telephone switching systems within the enterprise. You’ll get up to speed on the features in Asterisk ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. With more than 275 practical recipes, this expanded edition helps you perform data analysis with R quickly and efficiently. The R language provides everything you need to do statistical work, but its structure can be difficult to master. These task-oriented recipes make you productive with R immediately. Solutions range from basic tasks to input and output, general statistics, graphics, and linear regression. Each recipe addresses a specific problem and includes a discussion that explains the solution and provides insight into how it works. If you’re a beginner, R Cookbook will ... Read More

Feed: Kamran Agayev's Oracle Blog. Today, while creating an empty database in Exadata machine where there was enough free space and memory, we got the following error: SYS@TEST> startup nomount ORA-27154: post/wait create failed ORA-27300: OS system dependent operation:semget failed with status: 28 ORA-27301: OS failure message: No space left on device ORA-27302: failure occurred at: sskgpbitsper The problem wasn’t related with the space at all, even from the error message we see “No space left on device”. From the error output, I realized “OS system dependent operation:semget“, where “sem” means “semaphore“. Having enough free memory and space, the process ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. For data engineers and researchers new to stream processing, this practical book provides a professional reference that focuses on Apache Heron. Authors Huijun Wu and Maosong Fu from Twitter provide the basic knowledge you need to get started with this real-time processing engine. Learn how Heron serves as a general-purpose, modular, and extensible platform that you can use to support common real-time analytics use cases. Through the course of this book, you’ll discover approaches for tackling challenges in stream processing systems and applications. You’ll also understand how to build streaming ... Read More

Feed: Kamran Agayev's Oracle Blog. Python is getting more popular nowadays, because it is reliable and efficient, it has great corporate sponsors, and because of it’s amazing libraries that helps you to save time during the initial development cycle. It’s much more easy to connect to an Oracle Database from Python by using cx_Oracle module. To get more information about cx_Oracle module, check the following links: https://oracle.github.io/python-cx_Oracle/  https://cx-oracle.readthedocs.io/en/latest/installation.html In this blog post, I will show how to install Python and configure the environment and connect to the database. First of all, make sure you’ve an internet connection and install Python ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. The Lagom Framework is a modern approach to microservices on the JVM, built according to the principles of the Reactive Manifesto, allowing you to write resilient microservices that scale. This book takes Java and Scala developers step-by-step through the development of your first microservice-based system with Lagom, from setting up your development environment to running Lagom services in production. You’ll be introduced to the Lagom persistence API, which offers a guide-railed approach to Event Sourcing and CQRS. Furthermore, you’ll learn about asynchronous communication between microservices, some common design patterns for ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. Arista Networks has become a key player when it comes to software-driven cloud networking solutions for large data center storage and computing environments. In this updated edition of Arista Warrior, renowned consultant and technical author Gary Donahue (Network Warrior) provides an in-depth, objective guide to Arista’s lineup of hardware—and explains why its network switches and Extensible Operating System (EOS) are so effective. Anyone with a CCNA or equivalent knowledge will benefit from this book, especially entrenched administrators, engineers, or architects tasked with building an Arista network. Is Arista right for ... Read More

Feed: O'Reilly Media, Inc. Upcoming Titles. Author: O'Reilly Media, Inc.. Any programmer working with a dynamically typed language will tell you how hard it is to scale to more lines of code and more engineers. That’s why Facebook, Google, and Microsoft invented gradual static type layers for their dynamically typed JavaScript and Python code. This practical book shows you how one such type layer, TypeScript, is unique among them: it makes programming fun with its powerful static type system. If you’re a programmer with intermediate JavaScript experience, author Boris Cherny will teach you how to master the TypeScript language. You’ll ... Read More