存在非空索引情况下的段头损坏的恢复

创建一个测试表：

SQL> create table goolen as select * from dba_objects;

Table created.

SQL> alter table goolen add constraint pk_objd primary key (object_id);

Table altered.

SQL> select count(*) from goolen;

  COUNT(*)

----------

     72139
--查看，goolen表的段头块是block 50

SQL> select header_file,header_block from dba_segments where segment_name='GOOLEN';

HEADER_FILE HEADER_BLOCK

----------- ------------

          4           50

SQL> select file_id,block_id,blocks from dba_extents where segment_name='GOOLEN';

   FILE_ID   BLOCK_ID     BLOCKS

---------- ---------- ----------

         4         48          8

         4         56          8

         4         64          8

         4         72          8

         4         80          8

         4         88          8

         4         96          8

         4        104          8

         4        112          8

         4        120          8

         4        128          8

   FILE_ID   BLOCK_ID     BLOCKS

---------- ---------- ----------

         4        136          8

         4        144          8

         4        152          8

         4        160          8

         4        168          8

         4        256        128

         4        384        128

         4        512        128

         4        640        128

         4        768        128

         4        896        128

   FILE_ID   BLOCK_ID     BLOCKS

---------- ---------- ----------

         4       1024        128

         4       1152        128

24 rows selected.

SQL> col file_name for a55

SQL> set lines 120

SQL> select file_id,file_name,bytes from dba_data_files;

   FILE_ID FILE_NAME                                                    BYTES

---------- ------------------------------------------------------- ----------

         4 /opt/app/oracle/oradata/goolen/users01.dbf                12713984

         3 /opt/app/oracle/oradata/goolen/undotbs01.dbf              78643200

         2 /opt/app/oracle/oradata/goolen/sysaux01.dbf              629145600

         1 /opt/app/oracle/oradata/goolen/system01.dbf              713031680

----使用bbed破坏段头块，模拟段头损坏

BBED> set file 4 block 50

        FILE#           4

        BLOCK#          50

BBED> map /v

 File: /opt/app/oracle/oradata/goolen/users01.dbf (4)

 Block: 50                                    Dba:0x01000032

------------------------------------------------------------

BBED-00400: invalid blocktype (00)

BBED> m /x 1234 offset 24

Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y

 File: /opt/app/oracle/oradata/goolen/users01.dbf (4)

 Block: 50               Offsets:   24 to  535           Dba:0x01000032

------------------------------------------------------------------------

 12340000

SQL> show user

USER is "SCOTT"

SQL> select count(*) from goolen;

  COUNT(*)

----------

     72139

SQL> alter system flush buffer_cache;

System altered.

SQL> select /*+ full(goolen)*/ count(*) from goolen;

select /*+ full(goolen)*/ count(*) from goolen

                                        *

ERROR at line 1:

ORA-08103: object no longer exists

SQL> execute dbms_space_admin.tablespace_verify('&tablespace_name')

Enter value for tablespace_name: USERS

BEGIN dbms_space_admin.tablespace_verify('USERS'); END;

      *

ERROR at line 1:

ORA-06550: line 1, column 7:

PLS-00201: identifier 'DBMS_SPACE_ADMIN' must be declared

ORA-06550: line 1, column 7:

PL/SQL: Statement ignored

SQL> conn / as sysdba

Connected.

SQL> execute dbms_space_admin.tablespace_verify('&tablespace_name')

Enter value for tablespace_name: USERS

BEGIN dbms_space_admin.tablespace_verify('USERS'); END;

*

ERROR at line 1:

ORA-08103: object no longer exists

ORA-06512: at "SYS.DBMS_SPACE_ADMIN", line 83

ORA-06512: at line 1

SQL> oradebug setmypid

Statement processed.

SQL> oradebug tracefile_name

/opt/app/oracle/diag/rdbms/goolen/goolen/trace/goolen_ora_1678.trc

kcbzib: dump suspect buffer

buffer tsn: 4 rdba: 0x01000032 (4/50)

scn: 0x0000.00000000 seq: 0x01 flg: 0x01 tail: 0x00000001

frmt: 0x02 chkval: 0x0000 type: 0x00=unknown

Hex dump of block: st=0, typ_found=0

SQL> SELECT tablespace_name, segment_type, owner, segment_name

  2               FROM dba_extents

  3              WHERE file_id =&file_id

  4     and &block_id between block_id and block_id + blocks -1;

Enter value for file_id: 4

old   3:             WHERE file_id =&file_id

new   3:             WHERE file_id =4

Enter value for block_id: 50

old   4:    and &block_id between block_id and block_id + blocks -1

new   4:    and 50 between block_id and block_id + blocks -1

no rows selected

SQL> SELECT owner, segment_name, segment_type, partition_name 

  2               FROM dba_segments

  3             WHERE header_file =&file_id

  4     and header_block=&block_id;

Enter value for file_id: 4

old   3:            WHERE header_file =&file_id

new   3:            WHERE header_file =4

Enter value for block_id: 50

old   4:    and header_block=&block_id

new   4:    and header_block=50

OWNER                          SEGMENT_NAME                        SEGMENT_TYPE       PARTITION_NAME

------------------------------ ----------------------------------- ------------------ ------------------------------
SCOTT                          GOOLEN                              TABLE

SQL> select index_name,index_type from dba_indexes where table_name='GOOLEN';

INDEX_NAME                     INDEX_TYPE

------------------------------ ---------------------------

PK_OBJD                        NORMAL

--使用rowid来抽取数据

SQL> insert into goolen_bak 

  2  select * from goolen where rowid in 

  3  （select /*+ index(goolen PK_OBJD)*/ rowid from goolen )

  4  ;

72139 rows created.

SQL> commit;

Commit complete.

SQL> select count(*) from goolen_bak;

  COUNT(*)

----------

     72139