Difference between physical standby database and Data Guard

Hi guys,
Today I attended one interview. They asked me a difference between the Oracle Physical Standby database and Oracle Dataguard?
Upto my knowledge Oracle Physical Standby Database is one type of Standby Database can be configured using Oracle Databaguard Feature.
Can you people calrify me on this.
Regards,
Vijayaraghavan K

hello,
yes you are right upto some extent...here is para form oracle doc
Oracle Data Guard is the most effective and comprehensive
data availability, data protection, and disaster recovery solution
for enterprise databases. It provides the management, monitoring,
and automation software infrastructure to create and maintain one
or more synchronized standby databases to protect data from failures,
disasters, errors, and corruptions.
Data Guard standby databases can be located at remote disaster
recovery sites thousands of miles away from the production data center,
or they may be located in the same city, same campus,
or even in the same building. If the production database
becomes unavailable because of a planned or an unplanned outage,
Data Guard can switch any standby database to the production role,
thus minimizing downtime and preventing any data loss.oracle data guard is maximum availiblity solution which maintain physical standby databases and in case of failure of production can switch production role to and standby database.
read it here
http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardOverview.html
thanks and regards
VD
Edited by: Dixit on Aug 31, 2009 1:35 AM
Edited by: Dixit on Aug 31, 2009 1:36 AM

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helter_skelter wrote:
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Hello to all
I have created a physical standby database ,I want make backup of it by rman and when I lose it's datafile I can restore it ,making backup and restore is fine but in recovery I encounter some problem
scenarios is follow
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DB.RESETLOGS_TIME;" "http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/rman.htm")
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executing command: SET until clause
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using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from
backup set
restoring datafile 00001 to /u01/app/oracle/oradata/sari/system01.dbf
restoring datafile 00002 to /u01/app/oracle/oradata/sari/undotbs01.dbf
restoring datafile 00003 to /u01/app/oracle/oradata/sari/sysaux01.dbf
restoring datafile 00004 to /u01/app/oracle/oradata/sari/users01.dbf
restoring datafile 00005 to /u01/app/oracle/oradata/sari/example01.dbf
restoring datafile 00006 to /u01/app/oracle/oradata/sari/users02.dbf
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/0ek24dt4_1_1
channel ORA_DISK_1: restored backup piece 1
piece handle=/home/oracle/backup/0ek24dt4_1_1
tag=TAG20081213T042506
channel ORA_DISK_1: restore complete, elapsed time: 00:01:07
Finished restore at 13-DEC-08
Starting recover at 13-DEC-08
using channel ORA_DISK_1
starting media recovery
archive log thread 1 sequence 116 is already on disk as file /u01/app/oracle/oradata/archive/1_116_666786084.arc
archive log thread 1 sequence 117 is already on disk as file /u01/app/oracle/oradata/archive/1_117_666786084.arc
archive log filename=/u01/app/oracle/oradata/archive/1_116_666786084.arc thread=1 sequence=116
archive log filename=/u01/app/oracle/oradata/archive/1_117_666786084.arc thread=1 sequence=117
unable to find archive log
archive log thread=1 sequence=118
RMAN-03002: failure of recover command at 12/13/2008 05:14:13
RMAN-06054: media recovery requesting unknown log: thread 1
seq 118 lowscn 1392700
3- then I decline 1392701 to 1392700 and i run this command
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2> set until scn 1392700;
3> restore database ;
4> recover database;
5> }
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Starting restore at 13-DEC-08
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restoring datafile 00002 to /u01/app/oracle/oradata/sari/undotbs01.dbf
restoring datafile 00003 to /u01/app/oracle/oradata/sari/sysaux01.dbf
restoring datafile 00004 to /u01/app/oracle/oradata/sari/users01.dbf
restoring datafile 00005 to /u01/app/oracle/oradata/sari/example01.dbf
restoring datafile 00006 to /u01/app/oracle/oradata/sari/users02.dbf
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/0ek24dt4_1_1
channel ORA_DISK_1: restored backup piece 1
piece handle=/home/oracle/backup/0ek24dt4_1_1 tag=TAG20081213T042506
channel ORA_DISK_1: restore complete, elapsed time: 00:01:08
Finished restore at 13-DEC-08
Starting recover at 13-DEC-08
using channel ORA_DISK_1
starting media recovery
archive log thread 1 sequence 116 is already on disk as
file /u01/app/oracle/oradata/archive/1_116_666786084.arc
archive log thread 1 sequence 117 is already on disk as
file /u01/app/oracle/oradata/archive/1_117_666786084.arc
archive log filename=/u01/app/oracle/oradata/archive/1_116_666786084.arc thread=1
sequence=116archive log
filename=/u01/app/oracle/oradata/archive/1_117_666786084.arc
thread=1 sequence=117Oracle Error:
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS
would get error below
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u01/app/oracle/oradata/sari/system01.dbf'
media recovery complete, elapsed time: 00:00:10
Finished recover at 13-DEC-08
4- if I run
run{
restore database;
recover database;
I will recieve that error of step 2 (RMAN-06054: media recovery requesting unknown log: thread 1
seq 118 lowscn 1392700)
5- if I just restore the database and I don't perform recovery by rman and I restart redo apply all thing seem fine
but in opening database I'll recieve ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u01/app/oracle/oradata/sari/system01.dbf' error)
do you know what is problem
thanks
Edited by: ARKH on Dec 12, 2008 11:06 PM

hi
I myself have found the solution , when I recover the standby database
it do recovery but at the end of recovery it raise the error(RMAN-06054: media recovery requesting unknown log: thread 1
seq 118 lowscn 1392700) but if I begain redo apply before open the database
and I wait till all redo apply process start and communication between the
standby database and the primary database start, then I can
open the standby database and no error will raise
but if befor restarting redo apply I open the database I'll recieve the
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u01/app/oracle/oradata/sari/system01.dbf' error
thanks

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