Whats is diffrence between Dataguard and Stand by?

Hi All
I was asked for diffrence between Dataguard and StandBy Database in an interview.
I answered that prior to 9I, (in 8i) It was called StandBy Database and from 9I onwards, It is called DataGuard.
But interviewer doesnt seems to be satisfied with my answer. Not sure why?
Then i was asked for Diffrence in Logical Dataguard and Physical Dataguard?
I replied with "Logical DG" is one in which sql stements are applied onto standby whereas "Physical DG" is one in which redo logs are shipped from one server to other by itself (with services) and secondary upgrades itself from those. Again, interviewer didnt feel happy enough.
This has made me think, was my answer incorrect because i answered whatever i know. which i feel like is correct.
Please help me identify correct answer.
Thanks
aps

aps wrote:
Hi All
I was asked for diffrence between Dataguard and StandBy Database in an interview.
I answered that prior to 9I, (in 8i) It was called StandBy Database and from 9I onwards, It is called DataGuard.No - DataGuard is intimately involved with Standby Database, but it is NOT standby. A Data Guard 'configuration' actually includes the primary database and one or more standby databases as well as some additional processes and the connectivity between these things.
In simplistic terms:
Standby Database is an operating mode of the database in which it continuously applies redo logs that are shipped from another (primary) database. The mode of operation often stops the database from being accessible to users.
Logical standby database uses a 'recieving process' (SQL Apply) that extracts from the log and creates SQL statements which are applied to keep the standyby database in step with the primary.
Physical standby database uses a form of continuous database recovery by directly applying the redo logs received from the primary.
Data Guard was originally a set of scripts, but now is the entire environment including a set of processes that control the extraction of redo (directly from log bugger, from redo logs or archive redo logs) from the primary, shipping to the standby, ensuring that the logs are applied. Data Guard processes also include the mechanics needed to make the standby database active automatically (failover) or manually (switchover) and also to re-sync and make the original database active again (switchback).
You could (should) read more about this. Oracle has a fine set of documentation which you can access from http://tahiti.oracle.com - indeed selecting Database 10gR2, and switching to the Books tab you get to http://www.oracle.com/pls/db102/portal.portal_db?selected=3 . And by scrolling down a little to "Data Guard Concepts and Administration" you would get decent introduction in the first 2 pages of Chapter 1 "Introduction to Oracle Data Guard".
But interviewer doesnt seems to be satisfied with my answer. Not sure why?I would not be satisfied either. Especially if I was looking for swomeone to be responsible for availability scenarios for my corporate data.
Then i was asked for Diffrence in Logical Dataguard and Physical Dataguard?
I replied with "Logical DG" is one in which sql stements are applied onto standby whereas "Physical DG" is one in which redo logs are shipped from one server to other by itself (with services) and secondary upgrades itself from those. Again, interviewer didnt feel happy enough.Well ... you are moderately close on this. However, you seem to be missing "how do we get data from the primary in the SQL Apply case". The implication is that you are not at all comfortable with the basic concepts.
Again, I would not be terribly happy either. I would not be confident that you had read Chapter 1 of the Data Guard Concepts manual. And that could imply that you had not read Chapter 1 of ANY of the Concepts manuals. That chapter in each of the manuals is an easy read, complete with pictures, and it describes the basics of operating the big machine that the interviewer wants to entrust you with.
All that said, Data Guard is only available on Enterprise Edition. Standby capability is available on Standard Edition. And there are commercial products around that provide capability similar to Data Guard for Standard Edition.

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