to find checkpoint_change # to controlfile - autobackup vs Ckp_SCN #.

Hi all

(1) made a point of control to ensure that all checkpoint_change # SNA are synchronized.


select null, null, checkpoint_change#,null from v$database 
union all 
select file#, name, checkpoint_change# , last_Change# from v$datafile; 
 
          4095405 
1     +DATA/orcl/datafile/system.268.884148927     4095405 
2     +DATA/orcl/datafile/sysaux.269.884149053     4095405 
3     +DATA/orcl/datafile/undotbs1.270.884149167     4095405 
4     +DATA/orcl/datafile/usernew1.dbf     4095405 
5     +DATA/main/datafile/test.343.887323655     4095405

(2) run a fulbackup (autobackup controlfile on) and run the same query as above


select null, null, checkpoint_change#,null from v$database 
union all 
select file#, name, checkpoint_change# , last_Change# from v$datafile; 
 
          4095405 
1     +DATA/orcl/datafile/system.268.884148927     4095581 
2     +DATA/orcl/datafile/sysaux.269.884149053     4095581 
3     +DATA/orcl/datafile/undotbs1.270.884149167     4095581 
4     +DATA/orcl/datafile/usernew1.dbf     4095581 
5     +DATA/main/datafile/test.343.887323655     4095581

T1) why the checkpoint_change # in the database of v$ remains the same as before and yet datafiles checkpoint_change # has changed?

-- proceed to list backup and see the controfile's autobackup scn
list backup; 
... 
Control File Included: Ckp SCN: 4095640

Q2) why is the SNA cash at the same autobackup later then the checkpoint_change # in the database of v$?

Q3) how to find the last checkpoint_change # in the current controlfile then?

Q4) what is the use of the checkpoint_change # v$ database used since then? (because it does not reflect the last checkpoint #-v$ datafile.checkpoint_change # is more accurate)?

Kind regards

Noob

Hello

v$ database.checkpoint_change # Q1) is loaded from the record section of the controlfile right?
v$ datafile.checkpoint_change # Q2) is also responsible for controlfile right?

No, v$ datafile would be real datafile (AFAIK - as the nucleus is different for this) bonano$ x database $ kcc % structure (so she keeps track of more than all databases - my point of view more controlfile).

(T3) - the v$ database.checkpoint_change # is responsible of the controlfile and then it is used to match against what?

In your example above SNA for v$ database is 100, CPN for v$ datafile 6 is 98 and the v$ datafile_header is 97.  So, how the v$ database.checkpoint_change # a role here?  I mean just by comparing v$ datafile YVERT and v$ datafile_header SNA, we will know that there is a difference and a recovery is necessary.

Why do we still need to look at v$ database.checkpoint_change #?

v$ database is at the highest level of level/parent, and v$ datafile (x$ kcvdf) is a subset of the audit is made/done. v$ datafile_header (her picking up x$ kcvfh) both are different structures (If you dig the 'C' code header files so you can get to know), so it would play a break point (or) updates made to different internal control points are made by CKPT processes.  Now, you don't ask me on internal control points when and that process, so that you get support and view the code (it is people development oracle).

or spend some time x$ active_ckpt how it gets changed and everything what you can observe from the validations and cheating LGWR (I can't go beyond that).

Q4) in my scenario above, the v$ database.checkpoint_change # is significantly different from the v$ datafile and v$ datafile_header, but in reality no recovery is necessary.

v$ database 4177813

v$ datafile 4189456

v$ datafile_header 4189456

How does v$ database.checkpoint_change # here help to determine if a recovery is needed or not so?

I did not sit that is it his ' necessary recovery or non-compulsory. When you try to open it will provide information - based consistenct check with the data files (v$ datafile and v$ datafile_header) else believe me your cannot open it (as much my testing goes).

Now, don't say you took the backup and clone of another server, when it is permissible for you open resetlogs, so what is this case/situation, since the db you has opened, since you find no different to SNA (v$ datafile and v$ datafile_header) so he could continue with the new incarnation (new activation id #).  About the incarnation and activation id visit google or one of my blog where I have provided information on that.

v$ Database.checkpoint_change #-does not say any substance above recovery, its comparison with (v$ datafile and v$ datafile_header) would help on the recovery.

If you come back and say only above will be enough to decide that if recovery is necessary or not, so I can't decide on this, this is the /algorithm code, if you ask for reasons simply understand that we have below records

CHECKPOINT PROGRESS RECORD

EXTENDED ENTRY database... which contains the information

Automatic backup control date)

RECORDS IN DATA FILE

MULTI INSTANCE REDO APPLY RECORD... It's needs to check that all committed or rollback - in terms of CARS (so all the code depends on two or three columns of two control points and can't decide on recovery - according to my knowledge /understanding)

ARCHIVES NEWSPAPER RECORDS... If SNA isn't matches he can check what archives with SNA which are recovery - on this basis he asks what Archives need to apply.

Hope this helps and ask you to spend some time, you will understand things.

-Pavan Kumar N

Tags: Database

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    RMAN-00571: ===========================================================
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    Operating system Red Hat Enterprise Linux ES release 4 (Nahant Update 6)
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    RMAN> restore spfile  from autobackup
2> recovery area '/u01/app/oracle/flash_recovery_area'
3> db_name 'CHUNHUNG' maxdays 14;

    Enrique

  • Error when I configure snapshot controlfile RMAN

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    Configure controlfile autobackup on;

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    Configure redundancy 4 retention strategy;

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    RMAN-00571: ===========================================================

    RMAN-00569: = ERROR MESSAGE STACK FOLLOWS =.

    RMAN-00571: ===========================================================

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    "DO NOT CONNECT TO THE CATALOG.

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  • From control autobackup

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    Killed Dec 03 10:17:12 2013

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    ===

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    importance: -.
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