Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniquesAbout This BookDevelop a strong understanding of the base tools available within Red Hat Enterprise Linux (RHEL) and how to utilize these tools to troubleshoot and resolve real-world issuesGain hidden tips and techniques to help you quickly detect the reason for poor network/storage performanceTroubleshoot your RHEL to isolate problems using this example-oriented guide full of real-world solutions Who This Book Is For If you have a basic knowledge of Linux from administration or consultant experience and wish to add to your Red Hat Enterprise Linux troubleshooting skills, then this book is ideal for you. The ability to navigate and use basic Linux commands is expected.What You Will LearnIdentify issues that need rapid resolution against long term root cause analysisDiscover commands for testing network connectivity such as telnet, netstat, ping, ip and curlSpot performance issues with commands such as top, ps, free, iostat, and vmstatUse tcpdump for traffic analysisRepair a degraded file system and rebuild a software raidIdentify and troubleshoot hardware issues using dmesgTroubleshoot custom applications with strace and knowledge of Linux resource limitations In Detail Red Hat Enterprise Linux is an operating system that allows you to modernize your infrastructure, boost efficiency through virtualization, and finally prepare your data center for an open, hybrid cloud IT architecture. It provides the stability to take on today's challenges and the flexibility to adapt to tomorrow's demands. In this book, you begin with simple troubleshooting best practices and get an overview of the Linux commands used for troubleshooting. The book will cover the troubleshooting methods for web applications and services such as Apache and MySQL. Then, you will learn to identify system performance bottlenecks and troubleshoot network issues; all while learning about vital troubleshooting steps such as understanding the problem statement, establishing a hypothesis, and understanding trial, error, and documentation. Next, the book will show you how to capture and analyze network traffic, use advanced system troubleshooting tools such as strace, tcpdump & dmesg, and discover common issues with system defaults. Finally, the book will take you through a detailed root cause analysis of an unexpected reboot where you will learn to recover a downed system.Style and approach This is an easy-to-follow guide packed with examples of real-world core Linux concepts. All the topics are presented in detail while you’re performing the actual troubleshooting steps.

Create, develop and manage relational databases in real world applications using PostgreSQL About This Book Learn about the PostgreSQL development life cycle including its testing and refactoring Build productive database solutions and use them in Java applications A comprehensive guide to learn about SQL, PostgreSQL procedural language and PL/pgSQL Who This Book Is For If you are a student, database developer or an administrator, interested in developing and maintaining a PostgreSQL database, then this book is for you. No knowledge of database programming or administration is necessary. Readers should, however, know SQL. What You Will Learn Learn concepts of data modelling and relation algebra Install and set up PostgreSQL database server and client software Implement data structures in PostgreSQL Manipulate data in the database using SQL Implement data processing logic in the database with stored functions, triggers and views Test database solutions and assess the performance Integrate database with Java applications Detailed knowledge of the main PostgreSQL building objects, most used extensions Practice database development life cycle including analysis, modelling, (documentation), testing, bug fixes and refactoring In Detail PostgreSQL is one of the most powerful and easy to use database management systems. It has strong support from the community and is being actively developed with a new release every year. PostgreSQL supports the most advanced features included in SQL standards. Also it provides NoSQL capabilities, and very rich data types and extensions. All that makes PostgreSQL a very attractive solution in various kinds of software systems. The book starts with the introduction of relational databases with PostegreSQL. It then moves on to covering data definition language (DDL) with emphasis on PostgreSQL and common DDL commands supported by ANSI SQL. You will then learn the data manipulation language (DML), and advanced topics like locking and multi version concurrency control (MVCC). This will give you a very robust background to tune and troubleshoot your application. The book then covers the implementation of data models in the database such as creating tables, setting up integrity constraints, building indexes, defining views and other schema objects. Next, it will give you an overview about the NoSQL capabilities of PostgreSQL along with Hstore, XML, Json and arrays. Finally by the end of the book, you'll learn to use the JDBC driver and manipulate data objects in the Hibernate framework. Style and approach An easy-to-follow guide to learn programming build applications with PostgreSQL, and manage a PostgreSQL database instance.

Presentación Este libro ofrece cuarenta y ocho juegos y más de cincuenta variantes para la clase de espa?ol como lengua segunda o extranjera. Todos los juegos han sido testeados en grupos de distintos niveles de lengua, edades, lenguas maternas y nacionalidades, siempre con resultados exitosos. Los juegos están ordenados en fichas según los objetivos que persiguen. Cada ficha comienza mencionando estos objetivos (con especial foco en los de carácter lingüístico) y, de requerirlo, los materiales necesarios para llevar a cabo el juego (una foto, una bolsa…). A continuación?se explicita el procedimiento, el cual en muchos casos se acompa?a de variantes en nivel de complejidad o en tema. Desde luego, estas variantes no son exhaustivas: el docente podrá inventar muchas otras según los contenidos que desee practicar, el nivel de su grupo y su propia inventiva. Es menester aclarar que, en su mayoría, y según el modo en que el docente lo oriente, cada?uno de estos juegos puede servir para trabajar muy diversos puntos gramaticales o léxicos, si?bien algunos resultan más aptos para contenidos específicos. Acerca de la selección Desde el punto de vista lúdico, los juegos incluidos presentan gran variedad tipológica: juegos?de habilidad, de desafío personal, de competición, de colaboración, de simulación, de asociación, adivinanzas, juegos de mesa y otros que implican movimiento. En lo que hace a la lengua en sí, podemos distinguir entre los que se centran en el significado de las palabras y los que se aplican a estructuras gramaticales y funciones comunicativas. Algunos juegos requieren el manejo de cierta información sociocultural, histórica o geográfica. Están también los que se centran en la interacción oral o escrita y los que requieren de habilidades tales como inferir significado, parafrasear, encontrar sinónimos o antónimos, deducir reglas, construir familias de palabras, explorar sintaxis y otras. ___ VISITA NUESTRA P?GINA WEB?WWW.PAROLASLANGUAGES.COM

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