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The standby database feature has been provided by Oracle for many years Oracle Data Guard is the management and monitoring layer through which the standby databases are maintained The standby databases are kept up-to-date by propagating changes from the primary server continuously In the event of a disaster, a standby database is activated and brought online as the primary database Besides providing you protection against a total destruction of the primary database, the standby database can also be used for reporting purposes The databases maintained in an Oracle Data Guard configuration can be in the same LAN-based location, or they can be in a much wider WAN-supported network LAN-based local standby databases offer faster failure capabilities, and WAN-based databases are a better bet against a catastrophic disaster affecting your data center or local sites You can configure a primary database and several standby databases.

You can reduce downtime to less than a minute by choosing the proper protection level when you set up the standby databases Here is a brief summary of the many benefits of using the Oracle Data Guard standby database feature: High availability Protection against disasters Protection against physical data corruption Protection against user errors Failover and switchover capabilities, which can be used for both planned and unplanned switching of production and standby databases Geographical separation of primary and secondary servers through Oracle Net Oracle provides the excellent Oracle Data Guard Broker to help create and manage the Oracle Data Guard configurations The Oracle Data Guard Broker can support up to ten databases (one primary and nine standby) at a time The Oracle Data Guard Broker can manage tasks such as log application, log transportation, and switchover or failover from primary to secondary.

Of all the ways in which notifications can be ordered, the most important one is causal order, which indicates that notifications reach their destinations ordered in the same way as the events that triggered them. When dealing with causality, it is important to understand what I mean by event order. Events in the real world can occur at any time. If a software system is waiting for certain conditions to occur, there is going to be a difference between the time a condition occurs and the time it is detected as an event. For example, assume three conditions occur in the order e1, e2, e3. If the system uses a loop to check for each event, it might detect e3 first, then e1 and e2, as shown in Figure 3-34.

The Oracle Data Guard Broker offers two interfaces: a command-line interface and a GUI called the Data Guard Manager The Oracle Data Guard Broker is a great tool, in that it automates the many tasks involved in managing complex standby database groupings It also automates the often-complex networking aspects of maintaining standby databases..

Oracle Data Guard isn t meant for maintaining a low downtime. It s meant to serve in a disaster-protection capacity and to provide for an alternative database during scheduled maintenance of the production database.