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Master Oracle information protect 11g

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As transactions commit, they generate redo. This is where a detailed discussion of Data Guard can begin. Redo Transport Services Data Guard Redo Transport Services coordinate the transmission of redo from a primary database to the standby database. At the same time that the primary database LGWR process is writing redo to its ORL, a separate Data Guard process called the Log Network Server (LNS) is reading from the redo buffer in SGA and passes redo to Oracle Net Services for transmission to the standby database.

Both Redo Apply and SQL Apply enable the productive use of standby databases while in a standby role, without impacting data protection or the ability to achieve recovery time objectives (RTO). Now that you know what Redo Apply and SQL Apply have in common, you need to understand the differences between the two to determine which type of standby database is best suited to your requirements. An overview of the unique characteristics and benefits of Redo Apply and SQL Apply are discussed next. Additional details are provided in Chapters 2, 3, and 4.

Data Guard can support multiple standby databases in a single Data Guard configuration, and they may all have the same, or different, protection mode setting, depending on your requirements. The different Data Guard protection modes are Maximum Performance, Maximum Availability, and Maximum Protection. Maximum Performance This mode emphasizes primary database performance over data protection. It requires ASYNC redo transport so that the LGWR process never waits for acknowledgment from the standby database.

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