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$database_block_corruption c
WHERE f.file_id = c.file#
AND f.block_id <= c.block# + c.blocks - 1
AND f.block_id + f.blocks - 1 >= c.block#
ORDER BY file#, corr_start_block#;
OWNER
SEGMENT_TYPE SEGMENT_NAME
--------------------------------------------------------------------------------------------------------------------------------
------------------ ------------------------------
PARTITION_NAME
FILE# CORR_START_BLOCK#
CORR_END_BLOCK# BLOCKS_CORRUPTED
--------------------------------------------------------------------------------------------------------------------------------
---------- ----------------- --------------- ----------------
DESCRIPTION
--------------
7 694199
694199 1
Free Block
8 174445
174445 1
Free Block
Best regards,
Nenad
From: Leng <lkaing@xxxxxxxxx>
Sent: Freitag, 10. Dezember 2021 11:24
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Cc: ORACLE-L <oracle-l@xxxxxxxxxxxxx>
Subject: Re: v$database_block_corruption not cleared
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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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