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Database replication is widely used for fault-tolerance, scalability and performance. The failure of one database replica does not stop the system from working as available replicas can take over the tasks of the failed replica. Scalability can be achieved by distributing the load across all replicas, and adding new replicas should the load increase. Finally, database replication can provide fast local access, even if clients are geographically distributed clients, if data copies are located close to clients. Despite its advantages, replication is not a straightforward technique to apply, and there are many hurdles to overcome. At the forefront is replica control: assuring that data copies remain consistent when updates occur. There exist many alternatives in regard to where updates can occur and when changes are propagated to data copies, how changes are applied, where the replication tool is located, etc. A particular challenge is to combine replica control with transaction management as it requires several operations to be treated as a single logical unit, and it provides atomicity, consistency, isolation and durability across the replicated system. The book provides a categorization of replica control mechanisms, presents several replica and concurrency control mechanisms in detail, and discusses many of the issues that arise when such solutions need to be implemented within or on top of relational database systems. Furthermore, the book presents the tasks that are needed to build a fault-tolerant replication solution, provides an overview of load-balancing strategies that allow load to be equally distributed across all replicas, and introduces the concept of self-provisioning that allows the replicated system to dynamically decide on the number of replicas that are needed to handle the current load. As performance evaluation is a crucial aspect when developing a replication tool, the book presents an analytical model of the scalability potential of various replication solution. For readers that are only interested in getting a good overview of the challenges of database replication and the general mechanisms of how to implement replication solutions, we recommend to read Chapters 1 to 4. For readers that want to get a more complete picture and a discussion of advanced issues, we further recommend the Chapters 5, 8, 9 and 10. Finally, Chapters 6 and 7 are of interest for those who want get familiar with thorough algorithm design and correctness reasoning. Table of Contents: Overview / 1-Copy-Equivalence and Consistency / Basic Protocols / Replication Architecture / The Scalability of Replication / Eager Replication and 1-Copy-Serializability / 1-Copy-Snapshot Isolation / Lazy Replication / Self-Configuration and Elasticity / Other Aspects of Replication
For enterprise-wide data replication that works, you'll find the right tools for the right job--right here Data Replication: Tools and Techniques for Managing Distributed Information is a step-by-step guide to replicated data implementation, covering everything from technologies and terms to design approaches used by major vendors like IBM and Sybase to the latest in alternative design strategies. Here's everything on selecting the right set of replication tools and designing and building databases that work effectively with these tools. In addition, the book provides: * Clear data distribution methodology and tips and techniques for designing databases that use replication efficiently * A work plan for building an in-house framework for replication * An application developer's work plan for implementing replication * Highlighted "Tips" and "Warnings" and a Decision * Tree that offers easy selection of the best replication alternatives * Concepts applicable to both vendor-supplied and in-house solutions * Illustrative case studies on such topics as using replication within the OLAP operational data store, and OLTP and mobile computing environments
Consistency models for replicated data /Alan D. Fekete and Krithi Ramamritham --Replication techniques for availability /Robbert van Renesse and Rachid Guerraoui --Modular approach to replication for availability /Fernando Pedone and André Schiper --Stumbling over consensus research: misunderstandings and issues /Marcos K. Aguilera --Replicating for performance: case studies /Maarten van Steen and Guillaume Pierre --A history of the virtual synchrony replication model /Ken Birman --From viewstamped replication to byzantine fault tolerance /Barbara Liskov --Implementing trustworthy services using replicated state machines /Fred B. Schneider and Lidong Zhou --State machine replication with Byzantine faults /Christian Cachin --Selected results from the latest decade of quorum systems research /Michael G. Merideth and Michael K. Reiter --From object replication to database replication /Fernando Pedone and André Schiper --Database replication: a tutorial /Dettina Kemme, Ricardo Jiménez-Peris, Marta Patiño-Martínez, and Gustavo Alonso --Practical database replication /Alfrânio Correia Jr. ... [et al.].
Sybase 15 Replication Server Administration addresses the needs of a wide range of database professionals, explaining to both beginners and experts how to administer Sybase’s newest Replication Server release. This book examines all the knowledge, background information, and conceptual frameworks needed in order to get started on installing and administering Sybase Replication Server, and explores the world of contemporary cross-platform compatible Sybase Replication Server administration. Learn how to replicate business-critical data; configure database connections and routes; manage replicated tables, stored procedures, and subscriptions; set up a warm standby system; monitor replication performance and tune the database system; provide up-to-the-minute high availability of data; recover from failures and prevent data loss; troubleshoot the replication system.
Sybase 15 Replication Server Administration addresses the needs of a wide range of database professionals, explaining to both beginners and experts how to administer Sybase’s newest Replication Server release. This book examines all the knowledge, background information, and conceptual frameworks needed in order to get started on installing and administering Sybase Replication Server, and explores the world of contemporary cross-platform compatible Sybase Replication Server administration. Learn how to replicate business-critical data; configure database connections and routes; manage replicated tables, stored procedures, and subscriptions; set up a warm standby system; monitor replication performance and tune the database system; provide up-to-the-minute high availability of data; recover from failures and prevent data loss; troubleshoot the replication system.
PostgreSQL offers a comprehensive set of replication related features. Unleashing the power of PostgreSQL provides you with countless opportunities and a competitive advantage over other database systems. This book will guide you through the most important concepts of PostgreSQL replication. It contains all the information you need to design and operate replicated setups. Beginning by giving you an understanding of replication concepts, the PostgreSQL transaction log, and Point-in-time Recovery, we gradually move on to setting up asynchronous and synchronous replication. Next up, you will learn to monitor a PostgreSQL cluster setup, deal with monitoring tools, and then move on to understanding Linux High Availability. Further, we explore widely-used tools such as Slony, SkyTools, Postgres-XC, and walbouncer, and set up PL/Proxy. Finally, you'll get acquainted with the new technology of BDR, which allows bidirectional replication in PostgreSQL.
Replication Techniques in Distributed Systems organizes and surveys the spectrum of replication protocols and systems that achieve high availability by replicating entities in failure-prone distributed computing environments. The entities discussed in this book vary from passive untyped data objects, to typed and complex objects, to processes and messages. Replication Techniques in Distributed Systems contains definitions and introductory material suitable for a beginner, theoretical foundations and algorithms, an annotated bibliography of commercial and experimental prototype systems, as well as short guides to recommended further readings in specialized subtopics. This book can be used as recommended or required reading in graduate courses in academia, as well as a handbook for designers and implementors of systems that must deal with replication issues in distributed systems.
Add value to your IT organization with database replication Understand how database replication can solve your organization's business and technological challenges Organizations today have a growing need to move and synchronize data across the enterprise in real-time without the risk of system downtime or performance degradation. Database replication is the solution, but up until now, it's been costly and difficult to administer. This friendly guide explains how database replication will add value to your distributed organization in a cost-efficient and simple way. Understand the different techniques for database replication Reduce the likelihood of a major system or data outage Do real-time reporting without degraded application performance Consolidate and synchronize data from multiple data sources through replication Follow best practices to ensure your replication rollout is effective
Portable and precise, this pocket-sized guide delivers immediate answers for the day-to-day administration of Exchange Server 2010. Zero in on core support and maintenance tasks using quick-reference tables, instructions, and lists. You’ll get the focused information you need to solve problems and get the job done—whether you’re at your desk or in the field! Get fast facts to: Configure and manage Exchange clients Set up users, contacts, distribution lists, and address books Administer permissions, rules, policies, and security settings Manage databases and storage groups Optimize message processing, logging, and anti-spam filtering Administer at the command line using Exchange Management Shell Configure SMTP, connectors, links, and Edge subscriptions Manage mobile device features and client access Back up and restore systems
To make better informed business decisions, better serve clients, and increase operational efficiencies, you must be aware of changes to key data as they occur. In addition, you must enable the immediate delivery of this information to the people and processes that need to act upon it. This ability to sense and respond to data changes is fundamental to dynamic warehousing, master data management, and many other key initiatives. A major challenge in providing this type of environment is determining how to tie all the independent systems together and process the immense data flow requirements. IBM® InfoSphere® Change Data Capture (InfoSphere CDC) can respond to that challenge, providing programming-free data integration, and eliminating redundant data transfer, to minimize the impact on production systems. In this IBM Redbooks® publication, we show you examples of how InfoSphere CDC can be used to implement integrated systems, to keep those systems updated immediately as changes occur, and to use your existing infrastructure and scale up as your workload grows. InfoSphere CDC can also enhance your investment in other software, such as IBM DataStage® and IBM QualityStage®, IBM InfoSphere Warehouse, and IBM InfoSphere Master Data Management Server, enabling real-time and event-driven processes. Enable the integration of your critical data and make it immediately available as your business needs it.