ORA-01189错误常见于使用Create Controlfile命令时发现OFFLINE的数据文件或者备份文件生成于上一次的RESETLOGS之前，一般来说如果是在RESETLOGS前offline的数据文件，可以在CREATE CONTROLFILE命令中省略该offline datafile，在打开数据库后使用rename file命令修复其丢失的数据文件名，之后再将数据文件online；若不是offline datafile所造成的ORA-01189错误，就必须要找出与其他数据文件版本一致的数据文件或其备份才能解决该问题。
设想存在这样一个场景：数据库处于非归档无备份的状态，在周日使用shutdown immediate命令干净地关闭了数据库,到周一发现因为磁盘故障丢失了所有的控制文件，不得不使用Create Controlfile RESETLOGS重建控制文件，而在重建过程中又漏输了某条数据文件的记录，之后又使用alter database open resetlogs重置日志文件并打开数据库，此时发现丢失了一个数据文件，尝试使用针对offline datafile的处理方法将丢失的数据文件重命名(rename)，并尝试online该数据文件，毫无疑问我们会遇到ORA-01190 “control file or data file %s is from before the last RESETLOGS”错误，这时虽然我们手上有该”干净”的数据文件，却也没有办法使之online了。
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这里我介绍一种使用bbed修改数据文件头的方法来解决该ORA-01189错误:
[oracle@rh2 controlfile]$ oerr ora 1189 01189, 00000, "file is from a different RESETLOGS than previous files" // *Cause: In a CREATE CONTROLFILE command either this file or all previous // files were backups from before the last RESETLOGS. This may also // occur if this is a file that is offline and has been offline since // before the last RESETLOGS. // *Action: If the file was taken offline normal before the last RESETLOGS, // and is still offline, omit it from the CREATE CONTROLFILE command. // Rename and online the file after the database is open. Otherwise // find the version of the mentioned file consistent with the rest // of the datafiles and resubmit the command. [oracle@rh2 controlfile]$ oerr ora 1190 01190, 00000, "control file or data file %s is from before the last RESETLOGS" // *Cause: Attempting to use a data file when the log reset information in // the file does not match the control file. Either the data file // or the control file is a backup that was made before the most // recent ALTER DATABASE OPEN RESETLOGS. // *Action: Restore file from a more recent backup. /* 在我们的场景中wwli.dbf充当这样一个被"忽视"的数据文件 */ SQL> create tablespace we_will_lost_it datafile '/flashcard/wwli.dbf' size 20M; Tablespace created. SQL> create table lost_data tablespace we_will_lost_it as select * from obj$; Table created. SQL> alter database backup controlfile to trace ; Database altered. SQL> shutdown immediate; /* 删除所有的控制文件,切勿用于生产环境！ */ [oracle@rh2 ~]$ rm /flashcard/oradata/G10R2/controlfile/1.ctl [oracle@rh2 ~]$ sqlplus / as sysdba SQL*Plus: Release 10.2.0.4.0 - Production on Wed Apr 27 20:42:31 2011 Copyright (c) 1982, 2007, Oracle. All Rights Reserved. Connected to an idle instance. SQL> startup mount; ORACLE instance started. Total System Global Area 1224736768 bytes Fixed Size 2083560 bytes Variable Size 318768408 bytes Database Buffers 889192448 bytes Redo Buffers 14692352 bytes ORA-00205: error in identifying control file, check alert log for more info /* 使用create controlfile resetlogs重建控制文件，这里我们"无意"中丢失了一个数据文件 */ SQL> CREATE CONTROLFILE REUSE DATABASE "G10R2" RESETLOGS NOARCHIVELOG 2 MAXLOGFILES 16 3 MAXLOGMEMBERS 3 4 MAXDATAFILES 100 5 MAXINSTANCES 8 6 MAXLOGHISTORY 292 7 LOGFILE 8 GROUP 1 ( 9 '/flashcard/oradata/G10R2/onlinelog/o1_mf_1_6v34jnkn_.log', 10 '/s01/flash_recovery_area/G10R2/onlinelog/o1_mf_1_6v34jnst_.log' 11 ) SIZE 50M, 12 GROUP 2 ( 13 '/flashcard/oradata/G10R2/onlinelog/o1_mf_2_6v34jokt_.log', 14 '/s01/flash_recovery_area/G10R2/onlinelog/o1_mf_2_6v34jotq_.log' 15 ) SIZE 50M, 16 GROUP 3 ( 17 '/flashcard/oradata/G10R2/onlinelog/o1_mf_3_6v34jpmp_.log', 18 '/s01/flash_recovery_area/G10R2/onlinelog/o1_mf_3_6v34jpyn_.log' 19 ) SIZE 50M 20 -- STANDBY LOGFILE 21 DATAFILE 22 '/flashcard/oradata/G10R2/datafile/o1_mf_system_6v34hhyw_.dbf', 23 '/flashcard/oradata/G10R2/datafile/o1_mf_undotbs1_6v34hj0l_.dbf', 24 '/flashcard/oradata/G10R2/datafile/o1_mf_sysaux_6v34hhyx_.dbf', 25 '/flashcard/oradata/G10R2/datafile/o1_mf_users_6v34hj0p_.dbf', 26 '/flashcard/oradata/G10R2/datafile/o1_mf_example_6v34jthj_.dbf', 27 '/flashcard/oradata/G10R2/datafile/o1_mf_test_6vhlm3mv_.dbf', 28 '/flashcard/oradata/G10R2/datafile/o1_mf_lostfile_6vhtgo7w_.dbf' 29 -- we lost datafile here!!! '/flashcard/wwli.dbf' 30 CHARACTER SET UTF8 31 ; Control file created. SQL> recover database using backup controlfile ; ORA-00279: change 690423 generated at 04/27/2011 20:40:36 needed for thread 1 ORA-00289: suggestion : /s01/flash_recovery_area/G10R2/archivelog/2011_04_27/o1_mf_1_1_%u_.arc ORA-00280: change 690423 for thread 1 is in sequence #1 Specify log: {=suggested | filename | AUTO | CANCEL} /flashcard/oradata/G10R2/onlinelog/o1_mf_1_6v34jnkn_.log Log applied. Media recovery complete. SQL> alter database open resetlogs; Database altered. SQL> select * from v$recover_file; FILE# ONLINE ONLINE_ ERROR CHANGE# TIME ---------- ------- ------- ----------------------------------------------------------------- ---------- --------- 9 OFFLINE OFFLINE FILE MISSING 0 SQL> select name from v$datafile where file#=9; NAME -------------------------------------------------- /s01/db_1/dbs/MISSING00009 SQL> alter database rename file '/s01/db_1/dbs/MISSING00009' to '/flashcard/wwli.dbf'; Database altered. SQL> alter database datafile 9 online; alter database datafile 9 online * ERROR at line 1: ORA-01190: control file or data file 9 is from before the last RESETLOGS ORA-01110: data file 9: '/flashcard/wwli.dbf' /* 此时遭遇了我们之前描述的问题！ */ SQL> oradebug setmypid; Statement processed. /* 使用dump file_hdrs命令转储数据文件头，我们转储数据文件头的目的是为了获取resetlogs count,resetlogs scn */ SQL> oradebug dump file_hdrs 8; Statement processed. SQL> oradebug tracefile_name; /s01/admin/G10R2/udump/g10r2_ora_20029.trc Tablespace #0 - SYSTEM rel_fn:1 Creation at scn: 0x0000.00000005 03/12/2008 00:39:08 Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0 reset logs count:0x2cade887 scn: 0x0000.000a88f9 reset logs terminal rcv data:0x0 scn: 0x0000.00000000 prev reset logs count:0x2cadd4e7 scn: 0x0000.000a7f86 prev reset logs terminal rcv data:0x0 scn: 0x0000.00000000 recovered at 04/27/2011 20:45:34 status:0x2004 root dba:0x00400179 chkpt cnt: 85 ctl cnt:84 begin-hot-backup file size: 0 Checkpointed at scn: 0x0000.000a88fa 04/27/2011 20:46:00 Tablespace #1 - UNDOTBS1 rel_fn:2 Creation at scn: 0x0000.00092a47 03/12/2008 01:19:05 Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0 reset logs count:0x2cade887 scn: 0x0000.000a88f9 reset logs terminal rcv data:0x0 scn: 0x0000.00000000 prev reset logs count:0x2cadd4e7 scn: 0x0000.000a7f86 prev reset logs terminal rcv data:0x0 scn: 0x0000.00000000 recovered at 04/27/2011 20:45:34 status:0x4 root dba:0x00000000 chkpt cnt: 45 ctl cnt:44 begin-hot-backup file size: 0 Tablespace #10 - WE_WILL_LOST_IT rel_fn:9 Creation at scn: 0x0000.000a8849 04/27/2011 20:39:27 Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0 reset logs count:0x2cadd4e7 scn: 0x0000.000a7f86 reset logs terminal rcv data:0x0 scn: 0x0000.00000000 prev reset logs count:0x2cadcee3 scn: 0x0000.000a2af7 prev reset logs terminal rcv data:0x0 scn: 0x0000.00000000 recovered at 01/01/1988 00:00:00 status:0x0 root dba:0x00000000 chkpt cnt: 3 ctl cnt:2 begin-hot-backup file size: 0 Checkpointed at scn: 0x0000.000a88f7 04/27/2011 20:40:36 thread:1 rba:(0x1.c6f.10)
以上可以看到数据文件1和2的resetlogs count(0x2cade887),scn(000a88f9)都是一样的值，而我们的问题数据文件头中的对应信息则与之不同！
接下来我们使用bbed命令去修改问题数据文件头中的resetlogs count,scn信息，关于bbed的编译和使用可以参考这里。
[oracle@rh2 ~]$ bbed filename=/flashcard/wwli.dbf blocksize=8192 password=blockedit mode=edit
BBED: Release 2.0.0.0.0 - Limited Production on Wed Apr 27 20:59:14 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
BBED> set block 1
BLOCK# 1
BBED> map
File: /flashcard/wwli.dbf (0)
Block: 1 Dba:0x00000000
------------------------------------------------------------
Data File Header
struct kcvfh, 676 bytes @0
ub4 tailchk @8188
BBED> p kcvfh
struct kcvfh, 676 bytes @0
struct kcvfhbfh, 20 bytes @0
ub1 type_kcbh @0 0x0b
ub1 frmt_kcbh @1 0xa2 format 10.2
ub1 spare1_kcbh @2 0x00
ub1 spare2_kcbh @3 0x00
ub4 rdba_kcbh @4 0x02400001 RDBA
ub4 bas_kcbh @8 0x00000000
ub2 wrp_kcbh @12 0x0000
ub1 seq_kcbh @14 0x01
ub1 flg_kcbh @15 0x04 (KCBHFCKV)
ub2 chkval_kcbh @16 0xafa1 checksum
ub2 spare3_kcbh @18 0x0000
struct kcvfhhdr, 76 bytes @20
ub4 kccfhswv @20 0x00000000
ub4 kccfhcvn @24 0x0a200300 compatible
ub4 kccfhdbi @28 0xac859d12
text kccfhdbn[0] @32 G DB_NAME
text kccfhdbn[1] @33 1
text kccfhdbn[2] @34 0
text kccfhdbn[3] @35 R
text kccfhdbn[4] @36 2
text kccfhdbn[5] @37
text kccfhdbn[6] @38
text kccfhdbn[7] @39
ub4 kccfhcsq @40 0x00000245
ub4 kccfhfsz @44 0x00000a00
s_blkz kccfhbsz @48 0x00
ub2 kccfhfno @52 0x0009 FILE NUM
ub2 kccfhtyp @54 0x0003 FILE TYPE
ub4 kccfhacid @56 0x00000000
ub4 kccfhcks @60 0x00000000
text kccfhtag[0] @64
text kccfhtag[1] @65
text kccfhtag[2] @66
text kccfhtag[3] @67
text kccfhtag[4] @68
text kccfhtag[5] @69
text kccfhtag[6] @70
text kccfhtag[7] @71
text kccfhtag[8] @72
text kccfhtag[9] @73
text kccfhtag[10] @74
text kccfhtag[11] @75
text kccfhtag[12] @76
text kccfhtag[13] @77
text kccfhtag[14] @78
text kccfhtag[15] @79
text kccfhtag[16] @80
text kccfhtag[17] @81
text kccfhtag[18] @82
text kccfhtag[19] @83
text kccfhtag[20] @84
text kccfhtag[21] @85
text kccfhtag[22] @86
text kccfhtag[23] @87
text kccfhtag[24] @88
text kccfhtag[25] @89
text kccfhtag[26] @90
text kccfhtag[27] @91
text kccfhtag[28] @92
text kccfhtag[29] @93
text kccfhtag[30] @94
text kccfhtag[31] @95
ub4 kcvfhrdb @96 0x00000000
struct kcvfhcrs, 8 bytes @100 Creation Checkpointed at scn
ub4 kscnbas @100 0x000a8849
ub2 kscnwrp @104 0x0000
ub4 kcvfhcrt @108 0x2cade6ff
ub4 kcvfhrlc @112 0x2cadd4e7 resetlogs count
struct kcvfhrls, 8 bytes @116
ub4 kscnbas @116 0x000a7f86 resetlogs scn
ub2 kscnwrp @120 0x0000
ub4 kcvfhbti @124 0x00000000
struct kcvfhbsc, 8 bytes @128
ub4 kscnbas @128 0x00000000
ub2 kscnwrp @132 0x0000
ub2 kcvfhbth @136 0x0000
ub2 kcvfhsta @138 0x0000 (NONE)
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484 Checkpoint scn
ub4 kscnbas @484 0x000a88f7
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x2cade744
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000001
ub4 kcrbabno @504 0x00000c6f
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
ub4 kcvfhcpc @140 0x00000003
ub4 kcvfhrts @144 0x00000000
ub4 kcvfhccc @148 0x00000002
struct kcvfhbcp, 36 bytes @152
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 0x00000000
ub2 kscnwrp @156 0x0000
ub4 kcvcptim @160 0x00000000
ub2 kcvcpthr @164 0x0000
union u, 12 bytes @168
struct kcvcprba, 12 bytes @168
ub4 kcrbaseq @168 0x00000000
ub4 kcrbabno @172 0x00000000
ub2 kcrbabof @176 0x0000
ub1 kcvcpetb[0] @180 0x00
ub1 kcvcpetb[1] @181 0x00
ub1 kcvcpetb[2] @182 0x00
ub1 kcvcpetb[3] @183 0x00
ub1 kcvcpetb[4] @184 0x00
ub1 kcvcpetb[5] @185 0x00
ub1 kcvcpetb[6] @186 0x00
ub1 kcvcpetb[7] @187 0x00
ub4 kcvfhbhz @312 0x00000000
struct kcvfhxcd, 16 bytes @316
ub4 space_kcvmxcd[0] @316 0x00000000
ub4 space_kcvmxcd[1] @320 0x00000000
ub4 space_kcvmxcd[2] @324 0x00000000
ub4 space_kcvmxcd[3] @328 0x00000000
word kcvfhtsn @332 10 Tablespace#
ub2 kcvfhtln @336 0x000f
text kcvfhtnm[0] @338 W TABLESPACE_NAME
text kcvfhtnm[1] @339 E
text kcvfhtnm[2] @340 _
text kcvfhtnm[3] @341 W
text kcvfhtnm[4] @342 I
text kcvfhtnm[5] @343 L
text kcvfhtnm[6] @344 L
text kcvfhtnm[7] @345 _
text kcvfhtnm[8] @346 L
text kcvfhtnm[9] @347 O
text kcvfhtnm[10] @348 S
text kcvfhtnm[11] @349 T
text kcvfhtnm[12] @350 _
text kcvfhtnm[13] @351 I
text kcvfhtnm[14] @352 T
text kcvfhtnm[15] @353
text kcvfhtnm[16] @354
text kcvfhtnm[17] @355
text kcvfhtnm[18] @356
text kcvfhtnm[19] @357
text kcvfhtnm[20] @358
text kcvfhtnm[21] @359
text kcvfhtnm[22] @360
text kcvfhtnm[23] @361
text kcvfhtnm[24] @362
text kcvfhtnm[25] @363
text kcvfhtnm[26] @364
text kcvfhtnm[27] @365
text kcvfhtnm[28] @366
text kcvfhtnm[29] @367
ub4 kcvfhrfn @368 0x00000009
struct kcvfhrfs, 8 bytes @372
ub4 kscnbas @372 0x00000000
ub2 kscnwrp @376 0x0000
ub4 kcvfhrft @380 0x00000000
struct kcvfhafs, 8 bytes @384
ub4 kscnbas @384 0x00000000
ub2 kscnwrp @388 0x0000
ub4 kcvfhbbc @392 0x00000000
ub4 kcvfhncb @396 0x00000000
ub4 kcvfhmcb @400 0x00000000
ub4 kcvfhlcb @404 0x00000000
ub4 kcvfhbcs @408 0x00000000
ub2 kcvfhofb @412 0x0000
ub2 kcvfhnfb @414 0x0000
ub4 kcvfhprc @416 0x2cadcee3 prev reset logs count
struct kcvfhprs, 8 bytes @420 prev reset scn
ub4 kscnbas @420 0x000a2af7
ub2 kscnwrp @424 0x0000
struct kcvfhprfs, 8 bytes @428
ub4 kscnbas @428 0x00000000
ub2 kscnwrp @432 0x0000
ub4 kcvfhtrt @444 0x00000000
/* 以上kcvfh结构是数据文件头的主要信息，其中ub4 kcvfhrlc(offset 112)记录了resetlogs count，
而 struct kcvfhrls 8 bytes(offset 116)记录了resetlogs scn */
/* 接下来将问题数据文件头上的kcvfhrlc和kcvfhrls信息修改成和1号文件中的一样，
以欺骗Oracle让其以为该数据文件参与了上一次的RESETLOGS */
BBED> set offset 112
OFFSET 112
/* 在使用bbed modify的时候需要注意所在平台的endian,Linux上使用Little Endian */
BBED> modify /x 87e8
File: /flashcard/wwli.dbf (0)
Block: 1 Offsets: 112 to 623 Dba:0x00000000
------------------------------------------------------------------------
87e8ad2c 867f0a00 00000000 00000000 00000000 00000000 00000000 03000000
00000000 02000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 0a000000
0f005745 5f57494c 4c5f4c4f 53545f49 54000000 00000000 00000000 00000000
09000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 e3cead2c f72a0a00 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 f7880a00 00000000 44e7ad2c
01000160 01000000 6f0c0000 10000000 02000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<32 bytes per line>
BBED> p kcvfhrlc
ub4 kcvfhrlc @112 0x2cade887
BBED> set offset 116
OFFSET 116
BBED> modify /x 0xf988
File: /flashcard/wwli.dbf (0)
Block: 1 Offsets: 116 to 627 Dba:0x00000000
------------------------------------------------------------------------
f9880a00 00000000 00000000 00000000 00000000 00000000 03000000 00000000
02000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 0a000000 0f005745
5f57494c 4c5f4c4f 53545f49 54000000 00000000 00000000 00000000 09000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 e3cead2c f72a0a00 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 f7880a00 00000000 44e7ad2c 01000160
01000000 6f0c0000 10000000 02000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<32 bytes per line>
BBED> p kcvfhrls
struct kcvfhrls, 8 bytes @116
ub4 kscnbas @116 0x000a88f9
ub2 kscnwrp @120 0x0000
/* 还需要将kcvfhckp结构中的kcvcpscn也修改成与1号文件一样的resetlogs scn ,
否则在recover数据文件的时候可能出现
ORA-00600: internal error code, arguments: [2608], [1], [0], [690423], [0], [690425], [], []错误 */
BBED> set offset 484
OFFSET 484
BBED> modify /x 0xf9
File: /flashcard/wwli.dbf (0)
Block: 1 Offsets: 484 to 995 Dba:0x00000000
------------------------------------------------------------------------
f9880a00 00000000 44e7ad2c 01000160 01000000 6f0c0000 10000000 02000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0d000d00 0d000100 00000000 00000000 00000000 02004002 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<32 bytes per line>
BBED> p kcvfhckp
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x000a88f9
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x2cade744
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000001
ub4 kcrbabno @504 0x00000c6f
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
BBED> sum
Check value for File 0, Block 1:
current = 0xb897, required = 0xb899
/* 使用sum apply命令修改该数据块的checksum值 */
BBED> sum apply
Check value for File 0, Block 1:
current = 0xb899, required = 0xb899
SQL> alter database datafile '/flashcard/wwli.dbf' online;
alter database datafile '/flashcard/wwli.dbf' online
*
ERROR at line 1:
ORA-01113: file 9 needs media recovery
ORA-01110: data file 9: '/flashcard/wwli.dbf'
/* 完美地recover datafile 9，因为该数据文件中的数据本身就是"干净"的,
仅仅是datafile header中的resetlogs信息与其他datafile不一致而已 */
SQL> recover datafile 9;
Media recovery complete.
SQL> select * from v$recover_file where file#=9;
no rows selected
SQL> select count(*) from lost_data ;
COUNT(*)
----------
51791
/* That's great!
虽然我们也可以利用adjust_scn和设置隐藏参数”_allow_resetlogs_corruption”来尝试解决ORA-01189错误，但使用bbed可以避免用到”_allow_resetlogs_corruption”这个危险参数，且在之后更完美地recover恢复数据文件。
需要注意的是使用bbed修复问题数据文件并不能保证必然都成功，在使用bbed之前必须执行必要的备份，并在专业人士的指导下操作！
