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SQL> select * from emp where sal>2999;
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
 7788 SCOTT      ANALYST    7566 4/19/1987     3000.00               20
 7839 KING       PRESIDENT       11/17/1981    5000.00               10
 7902 FORD       ANALYST    7566 12/3/1981     3000.00               20
SQL> select dbms_rowid.rowid_relative_fno(rowid)file_id,dbms_rowid.rowid_block_number(rowid)block_id from emp  where sal>2999;
   FILE_ID   BLOCK_ID
---------- ----------
         5        204
         5        204
         5        204
SQL> update emp set job='ANALYST' where sal>2999;-----´Ë´¦¸üÐÂ3ÐУ¬ÄÇÈýÐоͻᱻlock
3 rows updated
SQL> select dump(job,'16') from emp where sal>2999;
DUMP(JOB,'16')
--------------------------------------------------------------------------------
Typ=1 Len=7: 41,4e,41,4c,59,53,54
Typ=1 Len=7: 41,4e,41,4c,59,53,54
Typ=1 Len=7: 41,4e,41,4c,59,53,54
SQL> alter system dump datafile 5


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