The concept of Standby database was existing since the Oracle version 7.3. Since then it had undergone a lot of changes and improvements. Let us summarise these changes/improvements from version 7.3 through 11g.
Oracle 7.3: Introduces Standby database. In this release the process of transferring archived redo logs was manual.
Oracle 8i: Supported the automatic shipping and application of archived redolog files from the primary site to standby site. It also supported opening of standby database for read only, however the recovery process must be stopped inorder to open it in read only mode.
Oracle 9iR1: Supported automatic gap resolution. Introduced various protection modes. Also introduced DataGuard Broker, an interface to manage the dataguard environment.
Oracle 9iR2: Introduced the concept of Logical Standby Database.
Oracle 10g: Introduced Real Time Apply, Fast Start Failover, Provided RAC support.
Oracle 11g: Introduces Active Dataguard which enables you to open the physical database in read only mode while the redo apply is active. Introduces Snapshot standby and redo compression.
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