SQL> SELECT DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(16831123) as "FILE_ID(LEAFBLOCK-1)", 2 DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(16831123) as "BLOCK_ID(LEAFBLOCK-1)", 3 DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(16831262) as "FILE_ID(LEAFBLOCK0)", 4 DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(16831262) as "BLOCK_ID(LEAFBLOCK0)" 5 FROM dual; FILE_ID(LEAFBLOCK-1) BLOCK_ID(LEAFBLOCK-1) FILE_ID(LEAFBLOCK0) BLOCK_ID(LEAFBLOCK0) -------------------- --------------------- ------------------- -------------------- 4 53907 4 54046 SQL> alter system dump datafile 4 block 53907; System altered. SQL> alter system dump datafile 4 block 54046; System altered.