Resuming the REDO APPLY : 10g and 11g Differences

Versions > 10.2, 11.2
OS > Solaris
I have a question on step4 below.
Both in 10g and 11g versions, for a Physical Standby DB, you
Step1.
Mount the DB using
startup nomount;
alter database mount ;Step2. Start the REDO Apply using
alter database recover managed standby database disconnect from session;Step3. Open the standby DB using
recover managed standby database cancel; -- stop the redo apply
alter database open ;
Step4. Resuming the REDO APPLY
alter database recover managed standby database using current logfile disconnect ;At this point (after step4 ), for 10.2 version, the standby DB goes back to mount mode , but the 11.2 DB remains open for READ ONLY queries because of ACTIVE DATAGUARD feature. Am I right ?

Yes, you are right.
In 10g, there is no option of active dataguard (redo applying is not possible when the database is opened). Redo applying is possible only when the standby database is in mount stage. When the database is opened in read only mode, the archive applying is not possible. In order to run queries on database tables, in a physical standby database, one had to stop the log apply and open the database in read-only mode. This means that the log files are being queued up during that period and will have to be applied once the database is reverted to the managed recovery mode.
In 11g, this is not the case. It allows users to have read-only access to the physical standby databases. This option gives customers the flexibility to run queries to the physical standby database, while the log shipping and apply continues its work.The archive applying can be done even when the database is opened in read only mode. This option is known as Active Dataguard (Oracle High Availability). For this, the steps you have mentioned are perfect. This is the advantage in 11g.

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