检测oracle数据库坏块的方法

检测oracle数据库坏块的办法：

1、使用DBV(DB File Verify)工具;

2、使用RMAN(Recovery Manager)工具;

DBV(DB File Verify)工具：

外部命令，物理介质数据结构完整性检查；

只能用于数据文件（offline或online），不支持控制文件和重做日志文件的块检查；

也可以验证备份文件（rman的copy命令备份或操作系统CP命令备份）；

进入盘符，然后执行以下脚本:

D:\app\Administrator\oradata\orcl>dbv file=ZL9MTLBASE.DBF blocksize=8192;

检测oracle数据库坏块的方法

RMAN(Recovery Manager)工具：

逻辑数据结构完整性检查；

在线使用Recovery Manager扫描坏块和备份时，需要数据库运行在归档模式（archive log），否则只能在数据库未打开（mount）的情况下进行；

RMAN>backup check logical validate datafile n ;

以上命令可以检查数据文件是否包含坏块，同时并不产生实际的备份输出。

而且当使用Recovery Manager进行实际的数据库备份时，同时也就进行了坏块检查。

直接使用RMAN的命令：backup validate check logical database;

结合V$DATABASE_BLOCK_CORRUPTION视图更方便。

1)、rman target / nocatalog

2)、RMAN> spool log to 'd:/dbbak/rmanlog.log';---指定输出rman日志文件

				?

									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;

4) 、--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 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#;

5)、

				?

									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;