bbed是一个强大的工具，允许我们绕过oracle直接从数据文件中修改对应的内容
[email protected]>select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- -------------------- ------------------ ---------- ------------ ---------- ---------- ----------
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
13 rows selected.
这里我们查看该表对应的物理块号
[email protected]>select rowid,dbms_rowid.rowid_object(rowid) robject, 2 dbms_rowid.rowid_relative_fno(rowid) fno, 3 dbms_rowid.rowid_block_number(rowid) bno, 4 dbms_rowid.rowid_row_number(rowid) rno from emp where rownum=1; ROWID ROBJECT FNO BNO RNO ------------------ ---------- ---------- ---------- ---------- AAASKaAAGAAAACDAAA 74394 6 131
使用bbed进行修改
BBED> set file 6 block 131
FILE# 6
BLOCK# 131
BBED> map
File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)
Block: 131 Dba:0x01800083
------------------------------------------------------------
KTB Data Block (Table/Cluster)
struct kcbh, 20 bytes @0
struct ktbbh, 96 bytes @20
struct kdbh, 14 bytes @124
struct kdbt[1], 4 bytes @138
sb2 kdbr[13] @142
ub1 freespace[7491] @168
ub1 rowdata[529] @7659
ub4 tailchk @8188
这里通过字符串形式查找 SCOTT
BBED> find /c SCOTT File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6) Block: 131 Offsets: 7902 to 8191 Dba:0x01800083 ------------------------------------------------------------------------ 53434f54 5407414e 414c5953 5403c24c 430777bb 04130101 0102c21f ff02c115 2c000803 c24e5305 434c4152 4b074d41 4e414745 5203c24f 280777b5 06090101 0103c219 33ff02c1 0b2c0008 03c24d63 05424c41 4b45074d 414e4147 455203c2 4f280777 b5050101 010103c2 1d33ff02 c11f2c00 0803c24d 37064d41 5254494e 0853414c 45534d41 4e03c24d 630777b5 091c0101 0103c20d 3302c20f 02c11f2c 000803c2 4c43054a 4f4e4553 074d414e 41474552 03c24f28 0777b504 02010101 03c21e4c ff02c115 2c000803 c24c1604 57415244 0853414c 45534d41 4e03c24d 630777b5 02160101 0103c20d 3302c206 02c11f2c 000803c2 4b640541 4c4c454e 0853414c 45534d41 4e03c24d 630777b5 02140101 0102c211 02c20402 c11f0206 c656 <32 bytes per line>
dump下来看是不是我们需要的内容：
BBED> d /v offset 7902 count 128 File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6) Block: 131 Offsets: 7902 to 8029 Dba:0x01800083 ------------------------------------------------------- 53434f54 5407414e 414c5953 5403c24c l SCOTT.ANALYST..L 430777bb 04130101 0102c21f ff02c115 l C.w............. 2c000803 c24e5305 434c4152 4b074d41 l ,....NS.CLARK.MA 4e414745 5203c24f 280777b5 06090101 l NAGER..O(.w..... 0103c219 33ff02c1 0b2c0008 03c24d63 l ....3....,....Mc 05424c41 4b45074d 414e4147 455203c2 l .BLAKE.MANAGER.. 4f280777 b5050101 010103c2 1d33ff02 l O(.w.........3.. c11f2c00 0803c24d 37064d41 5254494e l ..,....M7.MARTIN <16 bytes per line> BBED> d /v offset 7902 count 12 File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6) Block: 131 Offsets: 7902 to 7913 Dba:0x01800083 ------------------------------------------------------- 53434f54 5407414e 414c5953 l SCOTT.ANALYS <16 bytes per line> BBED> modify /c 'ZBDBA' offset 7902 Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6) Block: 131 Offsets: 7902 to 7913 Dba:0x01800083 ------------------------------------------------------------------------ 5a424442 4107414e 414c5953 <32 bytes per line> BBED> d /v offset 7902 count 12 File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6) Block: 131 Offsets: 7902 to 7913 Dba:0x01800083 ------------------------------------------------------- 5a424442 4107414e 414c5953 l ZBDBA.ANALYS <16 bytes per line> BBED> sum apply Check value for File 6, Block 131: current = 0x60f5, required = 0x60f5 BBED> verify DBVERIFY - Verification starting FILE = /opt/oracle/oradata/orcl11g/zbdba01.dbf BLOCK = 131 DBVERIFY - Verification complete Total Blocks Examined : 1 Total Blocks Processed (Data) : 1 Total Blocks Failing (Data) : 0 Total Blocks Processed (Index): 0 Total Blocks Failing (Index): 0 Total Blocks Empty : 0 Total Blocks Marked Corrupt : 0 Total Blocks Influx : 0 Message 531 not found; product=RDBMS; facility=BBED BBED>
刷新缓存：
alter system flush buffer_cache;
查看是否修改成功：
[email protected]>select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- -------------------- ------------------ ---------- ------------ ---------- ---------- ----------
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 ZBDBA KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
时间： 2024-10-07 01:12:25