The following list summarizes the advantages of using Oracle Data Guard compared to using remote mirroring solutions: Better network efficiencyWith Oracle Data Guard, only the redo data needs to be sent to the remote site and the redo data can be compressed to provide even greater network efficiency. Another possible configuration might be a testing hub consisting of snapshot standby databases. Note, however, that the synchronous redo transport does not impose any physical distance limitation. Table 7-3 Additional Capabilities of High Level Oracle High Availability Architectures, The foundation for all high availability architectures. Oracle Database is a single-instance, standalone (noncluster) database and it is the foundation for all high availability architectures. For storage migration, you are required to use both storage arrays by Oracle ASM temporarily. The Oracle Application Server High Availability Guide describes the following high availability services in Oracle Application Server in detail: Process death detection and automatic restart. Outages or data loss that could affect customer service and safety are avoided by using Oracle Data Guard synchronous transport and automatic failover (fast-start failover). Oracle Database High Availability Best Practices for information about configuring Oracle Database 11g with Oracle RAC on extended clusters, White papers about extended (stretch) clusters and about using standard NFS to support a third voting disk on an extended cluster configuration at http://www.oracle.com/technetwork/database/clustering/overview/. Many high availability architectures today use clusters alone to provide some rudimentary node redundancy and automatic node failover. For more information about constructing multiple-source replication environments, see the Oracle GoldenGate documentation. Footnote8With automatic block repair, this should be the most common block corruption repair. This is called Split Brain. However, starting from Oracle Database 12.1.0.2c, the node with higher weight will survive during split brain resolution. With Oracle RAC integration, database scalability is possible. When a database is started, Oracle Database allocates a memory area called the System Global Area (SGA) and starts one or more Oracle Database processes. At the logical standby database, the redo data is transformed into SQL statements, which are applied to the logical standby database.
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