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Oracle® Data Guard Concepts and Administration
12c Release 1 (12.1)

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Changes in This Release for Oracle Data Guard Concepts and Administration

This preface lists changes in Oracle Data Guard Concepts and Administration.

Changes in Oracle Database 12c Release 1 (12.1)

The following are changes in Oracle Data Guard Concepts and Administration for Oracle Database 12c Release 1 (12.1).

New Features

This section lists new features in the following areas:

Features Common to Redo Apply and SQL Apply

  • For better separation of duty, Oracle Database now provides an Oracle Data Guard-specific administration privilege, SYSDG, to handle standard administration duties for Oracle Data Guard. This new privilege is based on the least privilege principle, in which a user is granted only the absolutely necessary privileges required to perform a specific function, and no more. The SYSDBA privilege continues to work as in previous releases.

    See Oracle Database Security Guide for more information about the SYSDG privilege and all the operations it allows.

  • Primary database redo can now be cascaded in real time as it is being written to the standby redo log file at a physical standby or a far sync instance. This feature is known as real-time cascading and it requires a license for the Oracle Active Data Guard option.

    See Section 7.3, "Cascaded Redo Transport Destinations" for more information.

  • A new type of remote Oracle Data Guard destination, called a far sync instance, accepts redo from the primary database and then ships that redo to other members of the Oracle Data Guard configuration. When a far sync instance is included in an Oracle Data Guard configuration, it enables zero data loss failover at any distance and off-host redo transport compression to conserve WAN bandwidth, both without affecting primary database performance. The name of this feature is Oracle Active Data Guard Far Sync. To use it, you must have a license for the Oracle Active Data Guard option.

    See Chapter 5, "Far Sync."

  • Maximum Availability mode now allows the LOG_ARCHIVE_DEST_n attributes SYNC and NOAFFIRM to be used together. This enables a synchronous standby database to be deployed at a further distance from the primary site without increasing the impact on primary database performance. (In an Oracle Data Guard broker configuration, this is referred to as FASTSYNC mode.)

    See "Maximum Availability" for more information.

  • You can move the location of an online data file from one physical file to another physical file while the database is actively accessing the file. Moves on a primary database do not affect the standby, and vice versa.

    See "Moving the Location of Online Data Files".

  • If an Oracle Data Guard configuration is managed by Oracle Data Guard broker, then Oracle Global Data Services (GDS) is fully supported on the databases in that configuration. (GDS provides Oracle RAC-like service failover and load balancing for a set of replicated databases, within or across data centers.)

    If the configuration is not managed by the broker, then Oracle Global Data Services (GDS) is supported with the exception of role-based services.

    See Also:

Features Specific to Redo Apply

Features Specific to SQL Apply

Desupported Features

Some features previously described in this document are desupported in Oracle Database 12c Release 1 (12.1). See Oracle Database Upgrade Guide for a list of desupported features.