Corrupt logical block

Question

I want to check logical block corruption and repair it with dbms_repair package.
For that first i need to corrupt block logically.
How to corrupt oracle database table block logically? Is there any procedure to do that?
Thanks,

Answer 1

Hello,
Thanks for you resposes.
I tried to corrupt datablock by editing datafile and remove some data and add some data.
1. Execurted below rman commad
RMAN> backup validate check logical database;
Output show block is corrupted.
Below query is also listing corrupted blocks.
SQL> select * from v$database_block_corruption;
But when i am checking corruption with dbms_repair packges it doesn't list any corruption.
SET SERVEROUTPUT ON
DECLARE num_corrupt INT;
BEGIN
num_corrupt := 0;
DBMS_REPAIR.CHECK_OBJECT (
SCHEMA_NAME => 'TEST',
OBJECT_NAME => 'TEST1',
REPAIR_TABLE_NAME => 'REPAIR_TABLE',
CORRUPT_COUNT => num_corrupt);
DBMS_OUTPUT.PUT_LINE('number corrupt: ' || TO_CHAR (num_corrupt));
END;
Please let me know any other scenarios to corrupt LOGICAL block.
Thanks,