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昨天准备研究11g的query cache result 特性，准备用10g的老方法来直接通过
show parameter xxxx的方式来查看隐含参数，发现下面的创建视图语句居然报错ora-08102
如下是创建视图的脚本，后面是错误：
create or replace view show_hidden_v$parameter
(INST_ID, NUM , NAME , TYPE , VALUE , DISPLAY_VALUE, ISDEFAULT , ISSES_MODIFIABLE , ISSYS_MODIFIABLE , ISINSTANCE_MODIFIABLE,
ISMODIFIED , ISADJUSTED , ISDEPRECATED, DESCRIPTION, UPDATE_COMMENT, HASH)
as
select x.inst_id,
x.indx + 1,
ksppinm,
ksppity,
ksppstvl,
ksppstdvl,
ksppstdf,
decode(bitand(ksppiflg / 256, 1), 1, 'TRUE', 'FALSE'),
decode(bitand(ksppiflg / 65536, 3),
1,
'IMMEDIATE',
2,
'DEFERRED',
3,
'IMMEDIATE',
'FALSE'),
decode(bitand(ksppiflg, 4),
4,
'FALSE',
decode(bitand(ksppiflg / 65536, 3), 0, 'FALSE', 'TRUE')),
decode(bitand(ksppstvf, 7), 1, 'MODIFIED', 4, 'SYSTEM_MOD', 'FALSE'),
decode(bitand(ksppstvf, 2), 2, 'TRUE', 'FALSE'),
decode(bitand(ksppilrmflg / 64, 1), 1, 'TRUE', 'FALSE'),
ksppdesc,
ksppstcmnt,
ksppihash
from x$ksppi x, x$ksppcv y
where (x.indx = y.indx);
ORA-08102: index key not found, obj# 39, file 1, block 59847 (2)
从上面的8102错误来看，很明显是数据字典信息不一致了，也就是说该记录在ind$可能已经被清除了，
而在obj$中还存在。我们来看看obj# 39是什么对象？
SQL> SELECT relative_fno, owner, segment_name, segment_type
2 FROM dba_extents
3 WHERE file_id = 1
4 AND 59847 BETWEEN block_id AND block_id + blocks - 1;
RELATIVE_FNO OWNER SEGMENT_NAME SEGMENT_TYPE
------------ ------- ------------------------------ ------------------
1 SYS I_OBJ4 INDEX
SQL>
SQL> select owner,object_name,object_type,object_id from
2 dba_objects where object_name='I_OBJ4';
OWNER OBJECT_NAME OBJECT_TYPE OBJECT_ID
-------------------- ------------------------- ------------------- ----------
SYS I_OBJ4 INDEX 39
SQL>
对于ora-08102错误，如果是发生在index上，那么我们直接drop index然后重建就ok了。
那我们来试试直接重建会怎么样？
SQL> alter system set event='38003 trace name context forever, level 10' scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 167395328 bytes
Fixed Size 1335220 bytes
Variable Size 104857676 bytes
Database Buffers 58720256 bytes
Redo Buffers 2482176 bytes
Database mounted.
Database opened.
SQL> alter index I_OBJ4 rebuild;
alter index I_OBJ4 rebuild
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-00060: deadlock detected while waiting for resource
SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup migrate;
ORACLE instance started.
Total System Global Area 167395328 bytes
Fixed Size 1335220 bytes
Variable Size 104857676 bytes
Database Buffers 58720256 bytes
Redo Buffers 2482176 bytes
Database mounted.
Database opened.
SQL> alter index I_OBJ4 rebuild;
alter index I_OBJ4 rebuild
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-00060: deadlock detected while waiting for resource
SQL> drop index I_OBJ4;
drop index I_OBJ4
*
ERROR at line 1:
ORA-00701: object necessary for warmstarting database cannot be altered
SQL> alter index I_OBJ4 rebuild online;
alter index I_OBJ4 rebuild online
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-08102: index key not found, obj# 39, file 1, block 59847 (2)
SQL> analyze table obj$ VALIDATE STRUCTURE CASCADE;
analyze table obj$ VALIDATE STRUCTURE CASCADE
*
ERROR at line 1:
ORA-01499: table/index cross reference failure - see trace file
到这里，可能有人会问，为什么使用event 38003或migrate 模式无法rebuild 该index呢？
很简单，该index的obj# <56, 换句话说，也就是对于bootstrap$核心对象是无法通过上面
的2种方式来完成重建的。
通常来说到这个地步，如果不使用其他手段的话，那么只能使用ODU或DUL进行抽取数据然后重建数据库了。
其实对于这个问题，我们可以借助BBED来进行修复。
既然是数据不一致，那么我就想知道到底是哪儿不一致了？metalink 提供处理ora-8102的方法：
SQL> SELECT /*+ FULL(t1) */ DATAOBJ#, TYPE#,OWNER#,rowid
2 FROM obj$ t1
3 MINUS
4 SELECT /*+ index(t I_OBJ4) */ DATAOBJ#, TYPE#,OWNER#,rowid
5 FROM obj$ t;
DATAOBJ# TYPE# OWNER# ROWID
---------- ---------- ---------- ------------------
73416 2 0 AAAAASAABAAAPt8AAB
73419 0 0 AAAAASAABAAAADxAAb
SQL> select obj#,OWNER#,NAME,TYPE#,STATUS,FLAGS from obj$ where rowid='AAAAASAABAAAPt8AAB';
OBJ# OWNER# NAME TYPE# STATUS FLAGS
---------- ---------- ------------------------------ ---------- ---------- ----------
73416 0 TEST01 2 1 0
SQL> select obj#,OWNER#,NAME,TYPE#,STATUS,FLAGS from obj$ where rowid='AAAAASAABAAAADxAAb';
OBJ# OWNER# NAME TYPE# STATUS FLAGS
---------- ---------- ------------------------------ ---------- ---------- ----------
1 0 _NEXT_OBJECT 0 0 0
SQL>
SQL> select case when (NextObjNum - MaxObjNum) > 0
2 then 'GOOD'
else 'BAD'
end "OBJ_NUM_STATE"
from (select (select dataobj#
3 4 5 6 from sys.obj$
7 where name = '_NEXT_OBJECT') NextObjNum,
8 (select max(obj#)
9 from sys.obj$) MaxObjNum
10 from dual);
OBJ_
----
GOOD
从这里来看，_NEXT_OBJECT是ok的。那么我们重点就放在TEST01上了。
到这里，看到test01，我才想起这是很久以前做关于手工构造某个由于数据字典信息不一致而引发的某个600错误
而留下的隐患。
根据前面的报错，我们找到相应的trace，发现如下信息：
oer 8102.2 - obj# 39, rdba: 0x0040e9c7(afn 1, blk# 59847)
kdk key 8102.2:
ncol: 4, len: 16
key: (16): 04 c3 08 23 14 01 80 01 80 06 00 40 00 f1 00 1b
mask: (2048):
这里简单的进行说明：
ncol ---表示列数目
len ---表示长度
key: ():
关于ora-08012错误，大家可以参考 OERR: ORA-8102 "index key not found, obj# %s, file %s, block %s (%s)" [ID 8102.1]
下面我们继续，既然该block有问题，那么我就dump该block。
alter system dump datafile 1 block 59847
确定为如下2行数据：
row#131[2131] flag: ---D--, lock: 3, len=18
col 0; len 4; (4): c3 08 23 0a
col 1; len 1; (1): 80
col 2; len 1; (1): 80
col 3; len 6; (6): 00 40 00 f1 00 1b
row#133[2113] flag: ------, lock: 3, len=18
col 0; len 4; (4): c3 08 23 0f
col 1; len 1; (1): 80
col 2; len 1; (1): 80
col 3; len 6; (6): 00 40 00 f1 00 1b
SQL> select 2131+44+24*3 from dual;
2131+44+24*3
------------
2247
BBED> set file 1 block 59847
FILE# 1
BLOCK# 59847
BBED> set offset 2247
OFFSET 2247
BBED> d /v
File: /oracle/product/oradata/roger/system01.dbf (1)
Block: 59847 Offsets: 2247 to 2758 Dba:0x0040e9c7
-------------------------------------------------------
010304c3 08230a01 80018006 004000f1 l .....#.......@..
001b0000 04c30823 0202c102 01800600 l .......#........
40fb7c00 1a010003 c3082302 c1020180 l @.|.......#.....
060040fb 7c001b00 0004c308 226402c1 l ..
03018006 00402750 00090100 04c30822 l ......."
6202c102 01800600 40fb7c00 1a010004 l b.......@.|.....
c3082263 02c10201 80060040 fb7c001c l .."c.......@.|..
010004c3 08230501 80018006 004000f1 l .....#.......@..
001b0100 04c30822 6002c102 01800600 l ......."`.......
40fb7c00 1a010004 c3082264 01800180 l @.|......."d....
06004000 f1001b01 0004c308 225e02c1 l ..@........."^..
02018006 0040fb7c 001c0100 04c30822 l .....@.|......."
5d02c102 01800600 40fb7c00 1b010004 l ].......@.|.....
c308225b 02c10201 80060040 fb7c001c l .."[.......@.|..
010004c3 08225a02 c1020180 060040fb l ....."Z.......@.
7c001a01 0004c308 225f0180 01800600 l |......."_......
4000f100 1b010004 c3082256 02c11501 l @........."V....
80060040 fb7c0019 000004c3 08225702 l .
c1150180 060040fb 7c001801 0004c308 l ......@.|.......
225502c1 14018006 0040fb7b 000f0000 l "U.......@.{....
04c30822 5402c114 01800600 40fb7c00 l ..."T.......@.|.
17010004 c308225a 01800180 06004000 l ......"Z......@.
f1001b01 0004c308 225202c1 15018006 l ........"R......
0040fb7c 00160000 04c30822 5302c115 l ...
01800600 40fb7c00 15010004 c3082251 l
02c11401 80060040 fb7b000c 000004c3 l .......@.{......
08225002 c1140180 060040fb 7c001401 l ."P.......@.|...
0004c308 22550180 01800600 4000f100 l ...."U......@...
1b010004 c308224e 02c11501 80060040 l ......"N.......@
fb7c0013 000004c3 08224f02 c1150180 l .|......."O.....
060040fb 7c001201 0004c308 224d02c1 l ..
14018006 0040fb7b 00090000 04c30822 l .....@.{......."
<16 bytes per line>
BBED>
BBED> modify /x 14 offset 2253
File: /oracle/product/oradata/roger/system01.dbf (1)
Block: 59847 Offsets: 2253 to 2764 Dba:0x0040e9c7
------------------------------------------------------------------------
14018001 80060040 00f1001b 000004c3 08230202 c1020180 060040fb 7c001a01
0003c308 2302c102 01800600 40fb7c00 1b000004 c3082264 02c10301 80060040
27500009 010004c3 08226202 c1020180 060040fb 7c001a01 0004c308 226302c1
02018006 0040fb7c 001c0100 04c30823 05018001 80060040 00f1001b 010004c3
08226002 c1020180 060040fb 7c001a01 0004c308 22640180 01800600 4000f100
1b010004 c308225e 02c10201 80060040 fb7c001c 010004c3 08225d02 c1020180
060040fb 7c001b01 0004c308 225b02c1 02018006 0040fb7c 001c0100 04c30822
5a02c102 01800600 40fb7c00 1a010004 c308225f 01800180 06004000 f1001b01
0004c308 225602c1 15018006 0040fb7c 00190000 04c30822 5702c115 01800600
40fb7c00 18010004 c3082255 02c11401 80060040 fb7b000f 000004c3 08225402
c1140180 060040fb 7c001701 0004c308 225a0180 01800600 4000f100 1b010004
c3082252 02c11501 80060040 fb7c0016 000004c3 08225302 c1150180 060040fb
7c001501 0004c308 225102c1 14018006 0040fb7b 000c0000 04c30822 5002c114
01800600 40fb7c00 14010004 c3082255 01800180 06004000 f1001b01 0004c308
224e02c1 15018006 0040fb7c 00130000 04c30822 4f02c115 01800600 40fb7c00
12010004 c308224d 02c11401 80060040 fb7b0009 000004c3 08224c02 c1140180
<32 bytes per line>
BBED> sum apply
Check value for File 1, Block 59847:
current = 0xe5a9, required = 0xe5a9
BBED> modify /x 14 offset 2235
File: /oracle/product/oradata/roger/system01.dbf (1)
Block: 59847 Offsets: 2235 to 2746 Dba:0x0040e9c7
------------------------------------------------------------------------
14018001 80060040 00f1001b 010304c3 08231401 80018006 004000f1 001b0000
04c30823 0202c102 01800600 40fb7c00 1a010003 c3082302 c1020180 060040fb
7c001b00 0004c308 226402c1 03018006 00402750 00090100 04c30822 6202c102
01800600 40fb7c00 1a010004 c3082263 02c10201 80060040 fb7c001c 010004c3
08230501 80018006 004000f1 001b0100 04c30822 6002c102 01800600 40fb7c00
1a010004 c3082264 01800180 06004000 f1001b01 0004c308 225e02c1 02018006
0040fb7c 001c0100 04c30822 5d02c102 01800600 40fb7c00 1b010004 c308225b
02c10201 80060040 fb7c001c 010004c3 08225a02 c1020180 060040fb 7c001a01
0004c308 225f0180 01800600 4000f100 1b010004 c3082256 02c11501 80060040
fb7c0019 000004c3 08225702 c1150180 060040fb 7c001801 0004c308 225502c1
14018006 0040fb7b 000f0000 04c30822 5402c114 01800600 40fb7c00 17010004
c308225a 01800180 06004000 f1001b01 0004c308 225202c1 15018006 0040fb7c
00160000 04c30822 5302c115 01800600 40fb7c00 15010004 c3082251 02c11401
80060040 fb7b000c 000004c3 08225002 c1140180 060040fb 7c001401 0004c308
22550180 01800600 4000f100 1b010004 c308224e 02c11501 80060040 fb7c0013
000004c3 08224f02 c1150180 060040fb 7c001201 0004c308 224d02c1 14018006
<32 bytes per line>
BBED> sum apply
Check value for File 1, Block 59847:
current = 0xfea9, required = 0xfea9
BBED> verify
DBVERIFY - Verification starting
FILE = /oracle/product/oradata/roger/system01.dbf
BLOCK = 59847
Block Checking: DBA = 4254151, Block Type = KTB-managed data block
**** row 132: key out of order
---- end index block validation
Block 59847 failed with check code 6401
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 1
Total Blocks Failing (Index): 1
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED
BBED>
最后重启后，创建成功，再次检查发现一切ok。
BBED> verify
DBVERIFY - Verification starting
FILE = /oracle/product/oradata/roger/system01.dbf
BLOCK = 59847
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 1
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
最后尝试创建视图，发现一切正常，如下：
SQL> create or replace view show_hidden_v$parameter
2 (INST_ID, NUM , NAME , TYPE , VALUE , DISPLAY_VALUE, ISDEFAULT , ISSES_MODIFIABLE , ISSYS_MODIFIABLE , ISINSTANCE_MODIFIABLE,
3 ISMODIFIED , ISADJUSTED , ISDEPRECATED, DESCRIPTION, UPDATE_COMMENT, HASH)
4 as
5 select x.inst_id,
6 x.indx + 1,
7 ksppinm,
8 ksppity,
9 ksppstvl,
10 ksppstdvl,
11 ksppstdf,
12 decode(bitand(ksppiflg / 256, 1), 1, 'TRUE', 'FALSE'),
13 decode(bitand(ksppiflg / 65536, 3),
14 1,
15 'IMMEDIATE',
16 2,
17 'DEFERRED',
18 3,
19 'IMMEDIATE',
20 'FALSE'),
21 decode(bitand(ksppiflg, 4),
22 4,
23 'FALSE',
24 decode(bitand(ksppiflg / 65536, 3), 0, 'FALSE', 'TRUE')),
25 decode(bitand(ksppstvf, 7), 1, 'MODIFIED', 4, 'SYSTEM_MOD', 'FALSE'),
26 decode(bitand(ksppstvf, 2), 2, 'TRUE', 'FALSE'),
27 decode(bitand(ksppilrmflg / 64, 1), 1, 'TRUE', 'FALSE'),
28 ksppdesc,
29 ksppstcmnt,
30 ksppihash
31 from x$ksppi x, x$ksppcv y
32 where (x.indx = y.indx);
View created.
