What are the tools for checking block corruption in Oracle

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1.1DBVERIFY tool

Physical errors in data blocks can be detected by the DBV command.

[oracle@pxboracle ~] $dbv file=/u01/app/oracle/oradata/orcl/test01.dbf blocksize=8192

Backup command for 1.2RMAN

The backup command of RMAN can check for physical errors in data blocks during backup.

RMAN > backup datafile / u01/app/oracle/oradata/orcl/test01.dbf

Backup validate command for 1.3RMAN

RMAN > backup validate database;-verify all files, including data files, control files, parameter files

RMAN > backup validate datafile 4;-verify data file no. 4

1.4 DBMSHM package

The RUN_CHECK of the DBMS_HM package can check for block physical errors. It can detect only one extents.

SYS@devdb >

1 begin

2 dbms_hm.run_check (

3 check_name = > 'Data Block Integrity Check'

4 run_name = > 'df4test',-- check the test table in file 4

5 input_params = > 'BLC_DF_NUM=4;BLC_BL_NUM=128'); -' BLC_DF_NUM=4 indicates file number 4, BLC_BL_NUM=128-- block number

6 end

7 /

-check the inspection report to find the damage to the block in the No. 4 data file.

SYS@devdb > select dbms_hm.get_run_report ('df4test') from dual

-delete all tested reports

SYS@devdb >

1. Begin

2.dbms_hm.drop_schema ()

3.end

/

1.5 exp/expdp command

When the exp/expdp command exports the database, each block is scanned completely, so the physical error of the block is also checked.

[oracle@devdb ~] $exp scott/oracle owner=scott 1.6Use DBMS_REPAIR package

The DBMS_REPAIR package can check for block corruption of table and index objects.

Begin

Dbms_repair.admin_tables (table_name = > 'REPAIR_1'

Table_type = > dbms_repair.REPAIR_TABLE

Action = > dbms_repair.CREATE_ACTION)

End

Declare

Cor number

Begin

Dbms_repair.check_object (schema_name = > 'SYS'

Object_name = > 'BIG'

Repair_table_name = > 'REPAIR_1'

Corrupt_count = > cor)

Dbms_output.put_line (cor)

End

Select * from REPAIR_1

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