Oracle DataGuard已从最初只是做为一种容灾功能，到后期分担Primary SITE的负载，实现读写分离，在实时性，可用性，灵活性，分析诊断、功能种类引入了大量的特性，逐渐已成本了一个oracle生产环境标配, 这篇简单记录从10.1 到19c dataguard的主要新特性。
New Features Data Guard 10.1
Data Guard Broker Support for RAC
Automatc LogMiner Confguraton
Log Miner Support for Index-Organized Tables
LogMiner Support for More Types: LONG, Multbyte CLOB and NCLOB
Fine-Grained Supplemental Logging
Secured Redo Transmission
Uniquely Named Databases with DB_UNIQUE_NAME
Simplifed Zero Data Loss for Data Guard SQL Apply
Zero Downtme Instantaton for SQL Apply
Real Time Apply
Automatng Recovery Through Open Resetlogs in Standby Databases
New Features Data Guard 10.2
Fast-Start Failover
Automatc Conversion of the Primary Database to a Standby Database Upon Failover
Optmized Asynchronous Redo Transmission
Faster Redo Apply Failover
Faster SQL Apply Failover
Additonal Data Type Support in LogMiner and SQL Apply
Automatc Deleton of Applied Archive Logs
Data Guard: Improved Manageability for Redo Transport, Log Apply, and Broker
Easy Conversion of a Physical Standby Database to a Reportng Database
Flashback Across Data Guard Switchovers
Fine-Grained, Automated Tracking of SQL Apply Runtme Performance
Optmized Creaton of Logical Standby Database
New Features Data Guard 11.1
Fast-Start Failover for Maximum Performance Mode
Compression of Redo Trafc (Only for Gap Resoluton)
Real-Time Query Capability of Physical Standby Database
Fast Role Transitons in a Data Guard Confguraton
User Confgurable Conditons to Initate Fast-Start Failover
Dynamic Setng of Oracle Data Guard SQL Apply Parameters
Enhanced Data Guard Broker Based Management Framework
Enhanced Data Guard Management Interface (Using SQL*Plus)
Histogram for Redo Transport Response Time
Snapshot Standby
Strong Authentcaton for Data Guard Redo Transport
Enhanced DDL Handling in Oracle Data Guard SQL Apply
Enhanced Oracle RAC Switchover Support for Logical Standby Databases
Oracle Scheduler Support in Data Guard SQL Apply
Fine-Grained Auditng (FGA) Support in Data Guard SQL Apply
Support Transparent Data Encrypton (TDE) with Data Guard SQL Apply
Support XMLType Data Type (Only CLOB) in Data Guard SQL Apply
Virtual Private Database (VPD) Support in Data Guard SQL Apply
SMP Scalable Redo Apply
Archive Log Management Improvements
New Features Data Guard 11.2
Automatc Block Repair
Compressed Table Support in Logical Standby Databases and Oracle LogMiner
Confgurable Real-Time Query Apply Lag Limit
Integrated Support for Applicaton Failover in a Data Guard Confguraton
Support Up to 30 Standby Databases
Universal Connecton Pool (UCP) Integraton with Oracle Data Guard
Enable Sampling for Actve Data Guard
SQL Apply Support for Object Relatonal Model
SQL Apply Support for Binary XML
New Features Data Guard 12.1
Global Data Services (GDS),transparent to failover / switchover no client reconfiguration required.
Data Guard Support for Separaton of Duty (SoD)
Advanced Data Guard Broker Manageability
Oracle Data Guard Broker Support for Cascaded Standby Databases
Fast Sync
Single Command Role Transitons
Real-Time Apply is Default Setng for Data Guard
Resumable Switchover Operatons
Actve Data Guard Enhanced Security
Actve Data Guard Support for DML on Global Temporary Tables
Actve Data Guard Support for Sequences
Actve Data Guard Real-Time Cascade
Actve Data Guard Far Sync
SQL Apply Extended Data Type Support (EDS)
SQL Apply Support for Objects, Collectons, and XMLType
SQL Apply Support for XMLType
SQL Apply Support for SecureFiles LOBs
Data Guard Rolling Upgrade Support for Advanced Data Types
Data Guard Rolling Upgrade Support for XDB Repository
Disaster Protecton During Database Rolling Upgrade
Oracle Advanced Queuing (AQ) Support for Data Guard Database Rolling Upgrade
Oracle Data Guard Broker Support for Database Rolling Upgrades
Oracle Scheduler Support for Data Guard Database Rolling Upgrade
Rolling Upgrade Using Actve Data Guard
New Features Data Guard 12.2
Create a Standby Database with DBCA
Support for Diagnostic Pack with ADG
Support for SQL Tuning Advisor
Distributed Operatons on CLOB, BLOB and XMLType
OCI Support for Distributed LOBs
Minimizing Impact on Primary Database When Using Multple SYNC Standby Databases
Oracle Data Guard Database Compare
Subset Standby
Oracle Data Guard Broker Support for Multple Automatc Failover Targets
Oracle Data Guard Broker Support for Multple Observers
Simplifying Observer Management for Multple Fast-Start Failover Confguratons
Oracle Data Guard Broker Support for Transport Destnatons of Diferent Endianess Than the Primary
Oracle Data Guard Broker Support for Oracle Data Guard Multple Instance Apply
Oracle Data Guard Broker Support for Enhanced Alternate Destnaton
Fast-Start Failover in Maximum Protecton Mode
Block Comparison Tool Support in Oracle Data Guard Broker DGMGRL Interface
Oracle Data Guard Broker Support for Executng DGMGRL Command Scripts
Broker ConfguratonWideServiceName Confguraton Property
Enhancing Support for Alternate Destnatons
Automatcally Synchronize Password Files in Oracle Data Guard Confguratons
Preserving Applicaton Connectons to An Actve Data Guard Standby During Role Changes
NoLogging Changes for Data Guard
Multiple Instance Redo Apply (MIRA) in RAC
Automatic Password File Synchronization
In-Memory Support for ADG
Connection Preservation During Role Changes
DUPLICATE Command Enhancements for DG
New Features Data Guard 18C
In Memory Column store works with multi-instance redo apply
Multi-instance redo apply support with Block Change Tracking (BCT)
Global Temporary Table support from Standby.
DML operations on Standby Redirection to Primary without ACID compromise.
Preserve buffer cache during role-change.
Nologging enhancement Performance mode and Availability mode.
New RECOVER STANDBY DATABASE FROM SERVICE
New Broker VALIDATE commands VALIDATE Network Configuration.. Parameters.. etc..
New Features Data Guard 19C
Automatic Flashback Of Standby Database
Restore Point Replication From Primary To Standby
Active Data Guard-DML Redirection
Tuning Automatic Outage Resolution With Data Guard
Automatically Deleting Flashback Logs
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