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v$backup_corruption - FRACTURED vs. LOGICAL & Solutions

v$backup_corruption - FRACTURED vs. LOGICAL & Solutions

2005-08-10       - By Marquez, Chris

Reply:     1     2     3  


What is the meanings for "FRACTURED" & "LOGICAL" values in the CORRUPTION_TYPE
column of the v$backup_corruption view.

We are seeing these results when run this select.

select distinct a.FILE_ID, a.TABLESPACE_NAME, a.FILE_NAME, b.CORRUPTION_TYPE, b
.BLOCK#
from dba_data_files a, v$backup_corruption b
where a.FILE_ID = b.FILE#
order by a.FILE_ID, a.TABLESPACE_NAME, a.FILE_NAME, b.CORRUPTION_TYPE, b.BLOCK#
/
  FILE_ID TABLESPACE_NAME                FILE_NAME                            
   CORRUPTION_TYPE                 BLOCK#
-- ---- -- -- ---- ---- ---- ---- ---- -- -- ---- ---- ---- ---- ---- ---- ----
--- -- ---- ---- ---- ---- ---- -- ---- --
        4 USERS                          /o05/oradata/orcl/users01.dbf        
FRACTURED                        16138
        4 USERS                          /o05/oradata/orcl/users01.dbf        
FRACTURED                        16141
...
        6 E_INDX                   /o04/oradata/orcl/e_indx_06.dbf LOGICAL    
                    193043
        6 E_INDX                   /o04/oradata/orcl/e_indx_06.dbf LOGICAL    
                    193555
...


At one time we did have real RMAN and alert.log block errors when backing up
USERS tablespace.
Today I backed up this datafile using RMAN without error.
We have never used traditional OS HOT backup (mode) methods to backup our
database.

Our db_block_* parameters;
SQL> show parameter db_block_
NAME                                 TYPE            VALUE
-- ---- ---- ---- ---- ---- ---- --- -- ---- ---- -- -- ---- ---- ---- ---- ---
----
db_block_checking                    boolean         FALSE
db_block_checksum                    boolean         TRUE


How could "DBMS_REPAIR" and/or "DBVERIFY" be used to validate and fix any
corruption we might have.
Again, at this time do not have and have never been aware of alert.log errors
related to block corruption.
Also this database has be restored to other servers using RMAN without
indication of block corruption.


And again, what is the meaning, implications, checks, and solutions for;
"FRACTURED" & "LOGICAL" values?

Chris Marquez
Oracle DBA

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<P><FONT SIZE=2>What is the meanings for &quot;FRACTURED&quot; &amp; &quot
;LOGICAL&quot; values in the CORRUPTION_TYPE column of the v$backup_corruption
view.<BR>
<BR>
We are seeing these results when run this select.<BR>
<BR>
select distinct a.FILE_ID, a.TABLESPACE_NAME, a.FILE_NAME, b.CORRUPTION_TYPE, b
.BLOCK#<BR>
from dba_data_files a, v$backup_corruption b<BR>
where a.FILE_ID = b.FILE#<BR>
order by a.FILE_ID, a.TABLESPACE_NAME, a.FILE_NAME, b.CORRUPTION_TYPE, b.BLOCK#
<BR>
/<BR>
&nbsp;&nbsp; FILE_ID TABLESPACE_NAME&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FILE_NAME&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp; CORRUPTION_TYPE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BLOCK#<BR>
-- ---- -- -- ---- ---- ---- ---- ---- -- -- ---- ---- ---- ---- ---- ---- ----
--- -- ---- ---- ---- ---- ---- -- ---- --<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4 USERS&nbsp;&nbsp;&nbsp;&nbsp
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /o05/oradata/orcl/users01.dbf
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FRACTURED&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 16138<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4 USERS&nbsp;&nbsp;&nbsp;&nbsp
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /o05/oradata/orcl/users01.dbf
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FRACTURED&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 16141<BR>
...<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6 E_INDX&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp; /o04/oradata/orcl/e_indx_06.dbf LOGICAL&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 193043<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6 E_INDX&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp; /o04/oradata/orcl/e_indx_06.dbf LOGICAL&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 193555<BR>
...<BR>
<BR>
<BR>
At one time we did have real RMAN and alert.log block errors when backing up
USERS tablespace.<BR>
Today I backed up this datafile using RMAN without error.<BR>
We have never used traditional OS HOT backup (mode) methods to backup our
database.<BR>
<BR>
Our db_block_* parameters;<BR>
SQL&gt; show parameter db_block_<BR>
NAME&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TYPE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; VALUE<BR>
-- ---- ---- ---- ---- ---- ---- --- -- ---- ---- -- -- ---- ---- ---- ---- ---
----<BR>
db_block_checking&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boolean&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FALSE<BR>
db_block_checksum&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boolean&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TRUE<BR>
<BR>
<BR>
How could &quot;DBMS_REPAIR&quot; and/or &quot;DBVERIFY&quot; be used to
validate and fix any corruption we might have.<BR>
Again, at this time do not have and have never been aware of alert.log errors
related to block corruption.<BR>
Also this database has be restored to other servers using RMAN without
indication of block corruption.<BR>
<BR>
<BR>
And again, what is the meaning, implications, checks, and solutions for; &quot
;FRACTURED&quot; &amp; &quot;LOGICAL&quot; values?<BR>
<BR>
Chris Marquez<BR>
Oracle DBA</FONT>
</P>

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