【TUNE_ORACLE】檢視Oracle的壞塊在空閒空間中還是在已用空間中的SQL參考

實驗環境

搭建平臺：VMware Workstation

OS：RHEL 6.10

Grid&DB：Oracle 11.2.0.4

SQL參考

說明：如果沒有在RMAN執行命令“backup check logical validate database”，就不會在檢視 v$database_block_corruption中灌入資料，則 以下SQL也就可能不會有任何輸出！

--如果使用sqlplus查詢先要格式化

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#;