$ egrep -n '^Corrupt block relative dba| ^Reread of blocknum' alert.log| tail -50
124974:Corrupt block relative dba: 0x04c7d3be (file 12, block 312452)
124983:Reread of blocknum=312452, file=+DATA/db/datafile/db_data03.329.456465464. found valid data
124974|124983 are line number from alert.log
On reread found valid data, there is no need to proceed further since block has been validated. Typically, this occurs when there is a fractured block.
If you have doubts:
RMAN> backup validate check logical datafile 12;
SQL> select * from v$database_block_corruption;
Find corrupted segment.
select owner, segment_name, segment_type, partition_name
from dba_extents
where file_id = 12
and 312452 between block_id and block_id + blocks – 1
and rownum = 1
;OWNER ------------------------------ SEGMENT_NAME ----------------------------- SEGMENT_TYPE ------------------------------ PARTITION_NAME ------------------------------ MDINH T1 TABLE PARTITION T1_P8
