Synchronizing Disaster Recovery site with the production server

Hi All,
One of the customer is asking the following query:
"How Disaster recovery site can be synchronized with the production server and how do they switch? Will the web logic server do this for them?"
This customer is having two sites one live and one a DR (Disaster Recovery) site on different location.
Can somebody answer my query?
Thanks in advance.,
Regards.,
Naveen

Firstly
Is your Datagaurd Physical( Redo Apply) or Logical( SQL apply)?
Does it have Datagaurd Broker?
When Datagaurd is setup in your environment - on the primary database( live database) the Datagaurd users LGWR or/and ARCH process to collect redo data and ship this data to standby ( DR site) and the FAL process to provide client-server mechanism for shipping archived logs to standby.
On standby database, The Datagaurd users RFS process to receive redo records from primary database, the MRP process applies redo information to standby database.
If the Data Gaurd Broker is enabled, Datagaurd also used DMON process to manage and monitor both primary and standby databases as a unified configuration.
When there is any connectivity issue to the standby and when connection is re-established, the accumulated archive logs are automatically shipped and apploed to stanby, until stanby is resynchronized with the primary. This process does not require any administrative intervention.
If there is a very large Archive Gap between the primary and secondary due to some major issue. Then the unshipped archive logs need to be shipped manually from primary to standby and needs to be applied in standby to sync up with primary. For some reason there will also arise rare issues like problem with not applying of archive logs though log shipping is success. So some work arround will solve it.
Comming to planned /unplanned outages of production site.
Datagaurd has Failover and Switchover( planned ) methods, These are not automatic, but have to be explicitly initiated by the administrator( So there will be downtime but minimal). Once initiated, Datagaurd automates the processes involved.
- S K A
Edited by: user12297346 on Jan 27, 2010 7:13 AM

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