Explain about DataGuard

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DataGuard is an Oracle feature that provides high availability and disaster recovery solutions for databases.

DataGuard creates and maintains a standby database that can take over in case of a primary database failure.
It uses redo apply technology to keep the standby database synchronized with the primary database.
DataGuard can be configured in different modes such as maximum availability, maximum performance, and maximum protection.
It can also be used for rolling upgrades and testing without affecting the primary database.
DataGuard requires a separate license and additional hardware resources.
It is a critical component for ensuring business continuity and minimizing downtime.

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