1Z0-076 practice question 21 of 25

Which THREE statements are true about Far Sync instances?

Answer options

A: The Data Guard Broker must be used to deploy and manage Far Sync instances.

B: They work with any protection level.

C: They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary. Correct answer

D: They use an spfMe, a standby controlfile, and standby redo logs. Correct answer

E: A primary database can ship redo directly to multiple Far Sync instances. Correct answer

Correct Answer:

C. They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary.; D. They use an spfMe, a standby controlfile, and standby redo logs.; E. A primary database can ship redo directly to multiple Far Sync instances.

Explanation

A Far Sync instance is a lightweight destination that receives redo from the primary and forwards it to terminal standbys. This architecture allows the primary to use fast synchronous transport to a nearby Far Sync instance, which then forwards the redo asynchronously over a wide area network, thus protecting primary database performance (C). As a functional Oracle instance, it requires a parameter file (spfile), a standby control file, and standby redo logs (D). A primary database can be configured to ship redo to multiple destinations, including multiple Far Sync instances, to support complex disaster recovery topologies (E).

Why Incorrect

A: While the Data Guard Broker is the recommended tool for managing Far Sync instances, it is not mandatory; they can be configured manually with SQLPlus. B: Far Sync is designed for Maximum Availability and Maximum Performance modes. It is not supported in Maximum Protection mode, which requires a direct synchronous connection to a physical standby.

References

- Oracle Data Guard Concepts and Administration, 19c, Chapter 5, "Oracle Data Guard Far Sync". Section 5.1 states its purpose is to provide zero data loss protection over long distances without impacting primary performance.

- Oracle Data Guard Concepts and Administration, 19c, Section 5.3, "Creating a Far Sync Instance". This section details the required components, including a control file, server parameter file, and standby redo logs.

- Oracle Data Guard Concepts and Administration, 19c, Section 5.2, "Far Sync Instance Architecture". The diagrams and text illustrate how a primary can ship to multiple destinations, including Far Sync instances.

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