11 ORA-8102：Index Corruption解析

[oracle@DSI ~]$ oerr ora 8102
08102, 00000, "index key not found, obj# %s, file %s, block %s (%s)"
// *Cause: Internal error: possible inconsistency in index
// *Action: Send trace file to your customer support representative, along
// with information on reproducing the error
常见于索引键值与表上存的值不一致，可能是ORACLE的bug，也可能是由于硬件I/O错误所引起！
硬件或者I/O子系统由于丢失写 Lost Write造成块的逻辑上讹误，当一个Lost Io发生，包含对key的修改或者没有写入到ORACLE数据文件上，
这即可能发生在表块上也可能发生在索引块上。

ORA-8102：Index Corruption解析（Cont…）
创建索引-->更新数据块-->1号文件52号块-->con$
-->更新索引块-->1号文件xxx块-->con$
--二者不相等就会报错8102

--人为构建8102错误

SQL> conn test/***

Connected.

SQL> create table yhq_test(id int,name varchar2(100));

Table created.

SQL> begin

  for i in 1 .. 5000 loop

  insert into yhq_test values(i,'yhq'||i);

  commit;

  end loop;

end;

/  2    3    4    5    6    7  

PL/SQL procedure successfully completed.

SQL> select user_id,username from dba_users where username='TEST';

   USER_ID USERNAME

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

    83 TEST

SQL> alter table yhq_test add primary key(id);

Table altered.

SQL> select CONSTRAINT_NAME from dba_constraints where table_name='YHQ_TEST';

CONSTRAINT_NAME

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

SYS_C0011762

--查看索引文件块号

SQL> conn / as sysdba

Connected.

SQL> select dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) block#,

dbms_rowid.rowid_row_number(rowid) row#

from con$

where name='_NEXT_CONSTRAINT';   2    3    4  

     FILE#     BLOCK#        ROW#

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

     1      289          12

SQL> select  /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11763

SQL> select  /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11763

--这两个值相等是正常的

SQL> select * from bootstrap$ where obj#=52;

     LINE#     OBJ#

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

SQL_TEXT

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

    52       52

CREATE UNIQUE INDEX I_CON2 ON CON$(CON#) PCTFREE 10 INITRANS 2 MAXTRANS 255 STOR

AGE (  INITIAL 64K NEXT 1024K MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 O

BJNO 52 EXTENTS (FILE 1 BLOCK 464))

--用bbed查看并修改

BBED> set file 1 block 289

    FILE#              1

    BLOCK#             289

BBED> map /v

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 289                                   Dba:0x00400121

BBED> p *kdbr[]

rowdata[]

----------

ub1 rowdata[]                              @920      0x2c

BBED> x /rccnn

rowdata[]                                  @920

----------

flag@920:  0x2c (KDRHFL, KDRHFF, KDRHFH)

lock@921:  0x01

cols@922:     4

col    0[] @923: .

col   1[] @925: _NEXT_CONSTRAINT

col    2[] @942: 11763 ##这个11763和上面查到的一致

col    3[] @947: 0

--11763 修改为11764

--十进制转换

SQL> select dump(11763,16) from dual;

DUMP(11763,16)

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

Typ=2 Len=4: c3,2,12,40

SQL> select dump(11764,16) from dual;

DUMP(11764,16)

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

Typ=2 Len=4: c3,2,12,41

SQL> alter system flush buffer_cache;

System altered.

--修改并查看

BBED> d /v offset 942 count 32

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 289     Offsets:  942 to  973  Dba:0x00400121

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

 04c30212 4001802c 00040180 105f4e45 l .n.@..,....._NE

 58545f43 4f4e5354 5241494e 5403c302 l XT_CONSTRAINT.n

 <16 bytes per line>

BBED> modify /x 41 offset 946

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

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 289              Offsets:  946 to  977           Dba:0x00400121

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

 4101802c 00040180 105f4e45 58545f43 4f4e5354 5241494e 5403c302 1201802c 

 <32 bytes per line>

BBED> sum apply

Check value for File 1, Block 289:

current = 0xf014, required = 0xf014

BBED> d /v offset 942 count 32

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 289     Offsets:  942 to  973  Dba:0x00400121

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

 04c30212 4101802c 00040180 105f4e45 l .n.A..,....._NE

 58545f43 4f4e5354 5241494e 5403c302 l XT_CONSTRAINT.n

 <16 bytes per line>

BBED> p *kdbr[]

rowdata[]

----------

ub1 rowdata[]                              @920      0x2c

BBED> x /rccnn

rowdata[]                                  @920

----------

flag@920:  0x2c (KDRHFL, KDRHFF, KDRHFH)

lock@921:  0x01

cols@922:     4

col    0[] @923: .

col   1[] @925: _NEXT_CONSTRAINT

col    2[] @942: 11764 ###修改为11763+1

col    3[] @947: 0

--重启数据库，查看，并重建索引

--重启数据库

SQL> startup;

ORACLE instance started.

Total System Global Area  784998400 bytes

Fixed Size            2257352 bytes

Variable Size          478154296 bytes

Database Buffers      297795584 bytes

Redo Buffers            6791168 bytes

Database mounted.

Database opened.

SQL>

SQL>

SQL> select  /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11764

SQL> select  /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11763

--两个值不一样

SQL> conn test/test

Connected.

SQL> alter table yhq_test drop primary key;

Table altered.

SQL> alter table yhq_test add primary key(id);

alter table yhq_test add primary key(id)

*

ERROR at line 1:

ORA-00604: error occurred at recursive SQL level 1

ORA-08102: index key not found, obj# 52, file 1, block 78302 (2)

--查看错误日志

[oracle@DSI ~]$ tail -n 30 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_14127.trc

REDO RECORD - Thread:1 RBA: 0x000026.00004836.0010 LEN: 0x0074 VLD: 0x05

SCN: 0x0000.009c8d44 SUBSCN:  1 07/10/2019 09:52:46

(LWN RBA: 0x000026.00004836.0010 LEN: 0003 NST: 0001 SCN: 0x0000.009c8d44)

CHANGE #1 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ:0 OP:18.3 ENC:0

Reuse redo entry

Object reuse: tsn=5 objd=88123

REDO RECORD - Thread:1 RBA: 0x000026.00004839.018c LEN: 0x0048 VLD: 0x01

SCN: 0x0000.009c8d47 SUBSCN:  3 07/10/2019 09:52:46

(LWN RBA: 0x000026.00004839.0010 LEN: 0001 NST: 0001 SCN: 0x0000.009c8d47)

CHANGE #1 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ:0 OP:18.3 ENC:0

Reuse redo entry

Range reuse: tsn=5 base=20984144 nblks=8

END OF DUMP REDO

KQRCMT: Write failed with error=604 po=0x885dde30 cid=12

diagnostics : cid=12 hash=28d84319 flag=2a

[oracle@DSI ~]$ tail -n 30 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.log

--dump索引块--存放索引信息

SQL> alter system dump datafile 1 block 78302;

System altered.

[oracle@DSI ~]$ vim /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_14148.trc

Block header dump:  0x004131de

 Object id on Block? Y

 seg/obj: 0x34  csc: 0x00.9c8d42  itc: 3  flg: O  typ: 2 - INDEX

     fsl: 0  fnx: 0x4131df ver: 0x01

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc

0x01   0x0006.002.00005b68  0x00c07d95.01df.01  CB--    0  scn 0x0000.0096102a

0x02   0x0009.018.00005c53  0x00c00102.01f8.11  C---    0  scn 0x0000.009c713e

0x03   0x0008.003.00007a05  0x00c01bfd.0225.01  --U-    1  fsc 0x000f.009c8d43

Leaf block dump

===============

header address 139990239005300=0x7f520477ca74

kdxcolev 0

KDXCOLEV Flags = - - -

kdxcolok 0

kdxcoopc 0x80: opcode=0: iot flags=--- is converted=Y

kdxconco 1

kdxcosdc 1

kdxconro 359

kdxcofbo 754=0x2f2

kdxcofeo 1942=0x796

kdxcoavs 2591

kdxlespl 0

kdxlende 1

kdxlenxt 0=0x0

kdxleprv 4272605=0x4131dd

kdxledsz 6

kdxlebksz 8008

row#357[] flag: ---D--, lock: 3, len=13, data:(6):  00 41 57 47 00 61

col 0; len 4; (4):  c3 02 12 3f

row#[] flag: ------, lock: 0, len=13, data:(6):  00 40 01 21 00 0c ---1955 相对位置

col ; len ; ():  c3   

----- end of leaf block dump -----

End dump data blocks tsn: 0 file#: 1 minblk 78302 maxblk 78302

--使用bbed查看并修改

BBED> set file 1 block 78302;

    FILE#              1

    BLOCK#             78302

BBED> p ktbbh

SQL> select utl_raw.cast_to_number(replace('c3 02 12 40',' ')) from dual; --转成成十进制

UTL_RAW.CAST_TO_NUMBER(REPLACE('C3021240',''))

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

                     11763

BBED> d /v offset 1955 count 32 ------注意1955的来源

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 78302   Offsets: 1955 to 1986  Dba:0x004131de

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

 00000041 574600e8 04c30211 19010000 l ...AWF.毃......

 40012100 0c04c302 111a0000 00415746 l @.!...n.....AWF

 <16 bytes per line>

SQL> select 1955+20+24+24*3+8 from dual; --索引加124

1955+20+24+24*3+8

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

         2079

BBED> d /v offset 2079 count 32

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 78302   Offsets: 2079 to 2110  Dba:0x004131de

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

 04c30212 40000000 41574700 6004c302 l .n.@...AWG.`.n

 123e0100 00400121 000c04c3 02123f00 l .>...@.!...n.?.

 <16 bytes per line>

BBED> modify /x 41 offset 2083

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

 File: /u01/app/oracle/oradata/orcl/system01.dbf (1)

 Block: 78302            Offsets: 2083 to 2114           Dba:0x004131de

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

 41000000 41574700 6004c302 123e0100 00400121 000c04c3 02123f00 00004157 

 <32 bytes per line>

BBED> sum apply

Check value for File 1, Block 78302:

current = 0x35c8, required = 0x35c8

--重启db，并重建索引

-重启

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  784998400 bytes

Fixed Size            2257352 bytes

Variable Size          478154296 bytes

Database Buffers      297795584 bytes

Redo Buffers            6791168 bytes

Database mounted.

Database opened.

--修改为2个值一样

SQL> select  /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11764

SQL> select  /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT';

    OWNER# NAME                 CON#

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

     0 _NEXT_CONSTRAINT               11764

SQL> conn test/***

Connected.

SQL>  alter table yhq_test add primary key(id);

Table altered.

SQL> select CONSTRAINT_NAME from dba_constraints where table_name='YHQ_TEST';

CONSTRAINT_NAME

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

SYS_C0011764

---正常。

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11 ORA-8102：Index Corruption解析

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