Re: v$database_block_corruption not cleared

Hello Nenad,

I had faced a similar issue on the Windows platform, the corrupted block was not getting cleared.
When the Platform team reorg the disk, it got removed permanently.

Thanks
Nilesh

On Fri, Dec 10, 2021 at 4:52 PM Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

> Hi Leng,
>
>
>
> Thank you for the article.
>
>
>
> The block was returned to the free list:
>
>
>
> set lines 200 pages 10000
>
> col segment_name format a30
>
>
>
> SELECT e.owner, e.segment_type, e.segment_name, e.partition_name, c.file#
>
> , greatest(e.block_id, c.block#) corr_start_block#
>
> , least(e.block_id+e.blocks-1, c.block#+c.blocks-1) corr_end_block#
>
> , least(e.block_id+e.blocks-1, c.block#+c.blocks-1)
>
> - greatest(e.block_id, c.block#) + 1 blocks_corrupted
>
> , null description
>
> FROM dba_extents e, v$database_block_corruption c
>
> WHERE e.file_id = c.file#
>
> AND e.block_id <= c.block# + c.blocks - 1
>
> AND e.block_id + e.blocks - 1 >= c.block#
>
> UNION
>
> SELECT s.owner, s.segment_type, s.segment_name, s.partition_name, c.file#
>
> , header_block corr_start_block#
>
> , header_block corr_end_block#
>
> , 1 blocks_corrupted
>
> , 'Segment Header' description
>
> FROM dba_segments s, v$database_block_corruption c
>
> WHERE s.header_file = c.file#
>
> AND s.header_block between c.block# and c.block# + c.blocks - 1
>
> UNION
>
> SELECT null owner, null segment_type, null segment_name, null
> partition_name, c.file#
>
> , greatest(f.block_id, c.block#) corr_start_block#
>
> , least(f.block_id+f.blocks-1, c.block#+c.blocks-1) corr_end_block#
>
> , least(f.block_id+f.blocks-1, c.block#+c.blocks-1)
>
> - greatest(f.block_id, c.block#) + 1 blocks_corrupted
>
> , 'Free Block' description
>
> FROM dba_free_space f, v$database_block_corruption c
>
> WHERE f.file_id = c.file#
>
> AND f.block_id <= c.block# + c.blocks - 1
>
> AND f.block_id + f.blocks - 1 >= c.block#
>
> ORDER BY file#, corr_start_block#;
>
>
>
> OWNER
> SEGMENT_TYPE
> SEGMENT_NAME
>
> --------------------------------------------------------------------------------------------------------------------------------
> ------------------ ------------------------------
>
> PARTITION_NAME
> FILE# CORR_START_BLOCK# CORR_END_BLOCK# BLOCKS_CORRUPTED
>
> --------------------------------------------------------------------------------------------------------------------------------
> ---------- ----------------- --------------- ----------------
>
> DESCRIPTION
>
> --------------
>
>
>
>
> 7 694199
> 694199 1
>
> Free Block
>
>
>
>
>
>
> 8 174445 174445 1
>
> Free Block
>
>
>
> Best regards,
>
>
>
> Nenad
>
>
>
> *From:* Leng <lkaing_at_gmail.com>
> *Sent:* Freitag, 10. Dezember 2021 11:24
> *To:* Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> *Cc:* ORACLE-L <oracle-l_at_freelists.org>
> *Subject:* Re: v$database_block_corruption not cleared
>
>
>
> **** E-Mail from outside Vontobel:* Do not click on links or open
> attachments unless you know the content is safe. ***
>
> Hi Nenad,
>
>
>
> The corrupted block is returned to the free list to be reused. When a
> block is reused it is reformatted and that’s when the corruption is finally
> cleared.
>
>
>
> If you want to format it right away then you’ll need to try and create an
> object in the particular datafile and hope it picks up the corrupted block.
>
>
>
> See *336133.1*
>
>
>
> Cheers,
>
> Leng
>
>
>
>
>
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-- 
Thanks & Regards
Nilesh
Oracle DBA (sqlplus "/as sysdba" is my world)

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