虽然我们也可以通过dbv(db file verify)工具做到对单个数据文件的坏块检测，但是直接使用RMAN的"backup validate check logical database;"结合V$DATABASE_BLOCK_CORRUPTION视图要方便地多。 Script:

1) $ rman target / nocatalog2) RMAN> run {
allocate channel d1 type disk;
allocate channel d2 type disk;
allocate channel d3 type disk;
allocate channel d4 type disk;
backup validate check logical database;
}3) select * from V$DATABASE_BLOCK_CORRUPTION ;REM www.oracledatabase12g.com & www.askmaclean.com4) If V$DATABASE_BLOCK_CORRUPTION contains rows please run this query to
find the objects that contains the corrupted blocks: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 descriptionFROM dba_extents e, v$database_block_corruption cWHERE e.file_id = c.file#AND e.block_id <= c.block# + c.blocks - 1AND e.block_id + e.blocks - 1 >= c.block#
UNION
SELECT s.owner,s.segment_type,s.segment_name,s.partition_name,c.file#,header_block corr_start_block#,header_block corr_end_block#,1 blocks_corrupted,'Segment Header' descriptionFROM dba_segments s, v$database_block_corruption cWHERE 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' descriptionFROM dba_free_space f, v$database_block_corruption cWHERE f.file_id = c.file#AND f.block_id <= c.block# + c.blocks - 1AND f.block_id + f.blocks - 1 >= c.block#order by file#, corr_start_block#;SELECT tablespace_name, segment_type, owner, segment_name
FROM dba_extents
WHERE file_id = &fileid
and &blockid between block_id AND block_id + blocks - 1;