Purpose of the auxiliary instance in TSPITR

Need help!
I read Database Backup and Recovery Guide 11 g but I can't uderstand why we need an auxiliary instance to run tspitr.
We can complete the recovery of the space within the same instance, why it is impossible for the tspitr of?

Here Re: Question on recovery of Hemant K Chitale said: "+ you can't recover a tablespace to an SCN that is lower than the rest of the database. + ». Can someone help me uderstand why?

In this message Re: scn of the data after the restore file shows that when we turn tablespace offline, its YVERT becomes less than the other tablespaces SNA after awhile and when we spend it online "+ it will not redo it will adopt just current SNA +".

Published by: jonny.engineer on 23.04.2013 21:39

We can complete the recovery of the space within the same instance, why it is impossible for the tspitr of?

A TSIPTR is an incomplete recovery. Oracle does not allow you to run a database as to, say, stop and start, the data files are in different SNA. All data files must correspond to the same point in time. (TSPITR makes a compatible database - the auxiliary instance - and then uses the Transportable Tablespace for copying the tablespace and plug it into the original database. At this point, the Checkpoint SCN of data files to reset the tablespace GET transported to be consistent with the rest of the database).

Here Re: Question on recovery of Hemant K Chitale said: "You can not retrieve a tablespace to an SCN that is lower than the rest of the database.". Can someone help me uderstand why?

See my response above. A database cannot have data files that are from different points in time (SNA). The exception is when portable tablespaced is used - in this case the SNA control point transported data files are reset to be consistent with the database.

In this message Re: scn of the data after the restore file shows that when we move tablespace offline, its YVERT becomes less than the other tablespaces SNA after awhile and when we turn online "will not apply redo it will adopt just current SNA.

It's a tablespace which belongs to the database. Activity against the tablespace is interrupted once done the offline. The database knows that the data files are frozen and have no change. Therefore, it is easy for the database reset the SNA control point when the LINE is made.

Hemant K Collette

Tags: Database

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