By Gavin Powell
* Supported through all significant database structures, XML presents a simple, standardized approach to shifting facts among databases and to and from the net, self sufficient of the software program in use* deals database programmers and data-driven internet builders exact assistance on tips on how to comprehend and paintings with XML as info* various hands-on, step by step examples support readers learn how to simplify database paintings utilizing XML* indicates find out how to use XML to switch facts among a number of databases both internally or with exterior buyers and companions* Covers XML in well known databases together with Oracle Database, SQL Server, and short insurance of DB2 Database* Covers uncomplicated syntax for XML, the XML DOM, and XSL – with an emphasis on database use, and local XML databases* extra issues lined comprise local XML databases, XPath, XQuery, XLink, XPointer, DTDs, XML Schemas, between others
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Extra info for Beginning XML Databases (Wrox Beginning Guides)
2-6 Oracle9i Replication Master Replication Concepts Multimaster Replication Process There are two types of multimaster replication: asynchronous and synchronous. Asynchronous replication, often referred to as store-and-forward replication, captures any local changes, stores them in a queue, and, at regular intervals, propagates and applies these changes at remote sites. With this form of replication, there is a period of time before all sites achieve data convergence. Synchronous replication, also known as real-time replication, applies any changes or executes any replicated procedures at all sites participating in the replication environment as part of a single transaction.
Also, it is possible to configure asynchronous replication so that it simulates synchronous replication. See Also: "Scheduling Continuous Pushes" on page 6-23 for information about simulating synchronous replication in an asynchronous replication environment Procedural Replication Batch processing applications can change large amounts of data within a single transaction. In such cases, typical row-level replication might load a network with many data changes. To avoid such problems, a batch processing application operating in a replication environment can use Oracle's procedural replication to replicate simple stored procedure calls to converge data replicas.
Figure 2–1 illustrates a multimaster replication system. Oracle database servers operating as master sites in a multimaster replication environment automatically work to converge the data of all table replicas, and ensure global transaction consistency and data integrity. Conflict resolution is independently handled at each of the master sites. Multimaster replication provides complete replicas of each replicated table at each of the master sites. 2-2 Oracle9i Replication Master Replication Concepts If the replication environment is a hybrid environment (it has multiple master sites supporting one or more materialized view sites), then the target master site propagates any of the materialized view updates to all other master sites in the multimaster replication environment.