分类目录归档：非常规恢复

有一个客户数据库遭遇ORA-600 16703错误,故障原因见:警告：互联网中有oracle介质被注入恶意程序导致—ORA-600 16703,这种故障已经恢复比较多,在这次的恢复中遇到一个新错误,进行记录
接手给客户报错情况ORA-00600: internal error code, arguments: [16703], [1403], [20]

Thu May 13 22:36:11 2021
SMON: enabling cache recovery
Thu May 13 22:36:11 2021
NSA2 started with pid=61, OS id=6261 
Archived Log entry 90224 added for thread 1 sequence 50454 ID 0x19ae1c6c dest 1:
Errors in file /oracle/diag/rdbms/xff/xff/trace/xff_ora_5931.trc  (incident=741052):
ORA-00600: internal error code, arguments: [16703], [1403], [20], [], [], [], [], [], [], [], [], []
Incident details in: /oracle/diag/rdbms/xff/xff/incident/incdir_741052/xff_ora_5931_i741052.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Errors in file /oracle/diag/rdbms/xff/xff/trace/xff_ora_5931.trc:
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [16703], [1403], [20], [], [], [], [], [], [], [], [], []
Errors in file /oracle/diag/rdbms/xff/xff/trace/xff_ora_5931.trc:
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [16703], [1403], [20], [], [], [], [], [], [], [], [], []
Error 704 happened during db open, shutting down database
USER (ospid: 5931): terminating the instance due to error 704
Instance terminated by USER, pid = 5931
ORA-1092 signalled during: alter database open...
opiodr aborting process unknown ospid (5931) as a result of ORA-1092
Thu May 13 22:36:13 2021
ORA-1092 : opitsk aborting process

这种故障,由于是恶意脚本在数据库启动的时候清空tab$所致,使用bbed对tab$进行反向删除操作,实现数据库打开.
在这次的恢复过程中遇到ORA-600 16703 1403 4的错误

SQL> startup mount pfile='/tmp/pfile';
ORACLE instance started.

Total System Global Area 7.0818E+10 bytes
Fixed Size                  2260448 bytes
Variable Size            1.3422E+10 bytes
Database Buffers         5.7177E+10 bytes
Redo Buffers              217030656 bytes
Database mounted.
SQL> alter database open ;
alter database open
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [16703], [1403], [4], [], [], [],
[], [], [], [], [], []
Process ID: 51886
Session ID: 3497 Serial number: 3

根据ora-600 16703 1403 4基本上可以判断是由于tab$这个表中缺少obj#=4的对象导致,通过查询正常库,确认是该对象为tab$,也就是说由于tab$对象中少了tab$记录.通过bbed分析确认

SQL> SELECT a.OBJ#
  2        ,TAB#
  3        ,a.DATAOBJ#
  4        ,BOBJ#
  5        ,NAME
  6        ,DBMS_ROWID.ROWID_RELATIVE_FNO (a.ROWID) FILE_ID
  7        ,DBMS_ROWID.ROWID_BLOCK_NUMBER (a.ROWID) BLOCK_ID
  8    FROM TAB$ a, obj$ b
  9   WHERE     a.obj# = b.obj#
 10         AND A.OBJ# IN (4);

      OBJ#       TAB#   DATAOBJ#      BOBJ# NAME
---------- ---------- ---------- ---------- ------------------------------
   FILE_ID   BLOCK_ID
---------- ----------
         4          1          2          2 TAB$
         1        147

BBED> set dba 1,147
        DBA             0x00400093 (4194451 1,147)

BBED> x /rnnnnnnnnnnnnncnnnnnnnntnnnnnnnnnncct  *kdbr[14]
rowdata[6848]                               @7349
-------------
flag@7349: 0x20 (KDRHFH)
lock@7350: 0x02
cols@7351:    0
nrid@7352:0x00407b09.1
BBED> set dba 0x00407b09
        DBA             0x00407b09 (4225801 1,31497)

BBED> p kdbt[1]
struct kdbt[1], 4 bytes                     @110
   sb2 kdbtoffs                             @110      10
   sb2 kdbtnrow                             @112      2

BBED> x /rnnnnnnnnnnnnncnnnnnnnntnnnnnnnnnncct  *kdbr[11]
rowdata[815]                                @4436
------------
flag@4436: 0x5c (KDRHFL, KDRHFF, KDRHFD, KDRHFC)
lock@4437: 0x02
cols@4438:    0
ckix@4439:    8

BBED> x /rn  *kdbr[8]
rowdata[950]                                @4571
------------
flag@4571: 0xac (KDRHFL, KDRHFF, KDRHFH, KDRHFK)
lock@4572: 0x00
cols@4573:    1
kref@4574:    1
hrid@4576:0x00400093.8
nrid@4582:0x00400094.0
col    0[2] @4590: 4

确认该记录发生了行迁移导致该问题,对其对应的block进行修复,数据库正常打开.