BBED工具的安裝使用（二）
BBED常用的命令如下：
set 設定當前的環境
show 檢視當前的環境引數，跟sqlplus的同名命令類似。
dump 列出指定block的內容
find 在指定的block中查詢指定的字串，結果是顯示出字串，及其偏移量--offset，偏移量就是在block中的位元組數
modify 修改指定block的指定偏移量的值，可以線上修改。
copy 把一個block的內容copy到另一個block中
verify 檢查當前環境是否有壞塊
sum 計算block的checksum，modify之後block就被標識為壞塊，current checksum與reqired checksum不一致，sum命令可以計算出新的checksum並應用到當前塊。
undo 回滾當前的修改操作，如果手誤做錯了，undo一下就ok了，回到原來的狀態。
revert 回滾所有之前的修改操作，意思就是 undo all
[oracle@node1 ~]$ cd $ORACLE_HOME/rdbms/lib
[oracle@node1 lib]$ ./bbed password=blockedit
BBED: Release 2.0.0.0.0 - Limited Production on Thu Jul 10 17:57:09 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
SET
此時沒有指定任何的parfile登入，show命令看不到環境資訊
BBED> show
FILE# 0
BLOCK# 1
OFFSET 0
DBA 0x00000000 (0 0,1)
FILENAME
BIFILE bifile.bbd
LISTFILE
BLOCKSIZE 8192
MODE Browse
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
set filename用來指定資料檔案
BBED> set filename '/u01/app/oracle/oradata/orcl_dup/users01.dbf';
FILENAME /u01/app/oracle/oradata/orcl_dup/users01.dbf
BBED> show
FILE# 0
BLOCK# 1
OFFSET 0
DBA 0x00000000 (0 0,1)
FILENAME /u01/app/oracle/oradata/orcl_dup/users01.dbf
BIFILE bifile.bbd
LISTFILE
BLOCKSIZE 8192
MODE Browse
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
如果已經指定listfile，也可以直接跟list中對應的檔案編號
[oracle@node1 lib]$ cat /u01/bbedlist.parf
1 /u01/app/oracle/oradata/orcl_dup/system01.dbf 524288000
3 /u01/app/oracle/oradata/orcl_dup/sysaux01.dbf 346030080
4 /u01/app/oracle/oradata/orcl_dup/users01.dbf 191365120
5 /u01/app/oracle/oradata/orcl_dup/example01.dbf 104857600
6 /u01/app/oracle/oradata/orcl_dup/tts01.dbf 20971520
7 /u01/app/oracle/oradata/orcl_dup/tts02.dbf 20971520
8 /u01/app/oracle/oradata/orcl_dup/undotbs001.dbf 104857600
指定listfile
BBED> set listfile '/u01/bbedlist.parf'
LISTFILE /u01/bbedlist.parf
BBED> set file 4;
FILE# 4
BBED> show
FILE# 4
BLOCK# 1
OFFSET 0
DBA 0x01000001 (16777217 4,1)
FILENAME /u01/app/oracle/oradata/orcl_dup/users01.dbf
BIFILE bifile.bbd
LISTFILE /u01/bbedlist.parf
BLOCKSIZE 8192
MODE Browse
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
設定指定檔案中的block
BBED> set block 692;
BLOCK# 692
BBED> show
FILE# 4
BLOCK# 692
OFFSET 0
DBA 0x010002b4 (16777908 4,692)
FILENAME /u01/app/oracle/oradata/orcl_dup/users01.dbf
BIFILE bifile.bbd
LISTFILE /u01/bbedlist.parf
BLOCKSIZE 8192
MODE Browse
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
BBED> set block +10
BLOCK# 702
BBED> set block -20
BLOCK# 682
BBED> show block
BLOCK# 682
設定偏移量
BBED> set offset 20;
OFFSET 20
BBED> set offset +1;
OFFSET 21
BBED> set offset -1;
OFFSET 20
BBED> show offset;
OFFSET 20
設定blocksize大小
該值的大小要與資料庫的db_block_size想對應，否則會報錯
SQL> show parameter db_block_size
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_block_size integer 8192
BBED> set blocksize 12345;
BBED-00108: illegal BLOCKSIZE (12345) specified
BBED> set blocksize 8192;
BLOCKSIZE 8192
width設定當前螢幕的寬度，預設是80
count設定dump 命令顯示bytes的數量。預設是512 bytes
ibase設定內部的數字格式，預設是十進位制；也可以設定為十六進位制或者八進位制；設定完數字格式之後，可是使用該格式來設定blcok，offset等
BBED> set width 100
WIDTH 100
BBED> set count 1000
COUNT 1000
一個比較重要的引數 mode，設定bbed 的模式，該預設有2種：browse 和 edit。 browse 模式不允許進行修改。 如果要修改，就選擇edit模式。
BBED> show mode
MODE Browse
BBED> set mode edit;
MODE Edit
BBED> show mode
MODE Edit
INFO
info顯示當前可以進行browse 或者edit 的file。即我們filelist 裡指定的datafile資訊。
BBED> info
File# Name Size(blks)
----- ---- ----------
1 /u01/app/oracle/oradata/orcl_dup/system01.d 64000
3 /u01/app/oracle/oradata/orcl_dup/sysaux01.d 42240
4 /u01/app/oracle/oradata/orcl_dup/users01.db 23360
5 /u01/app/oracle/oradata/orcl_dup/example01. 12800
6 /u01/app/oracle/oradata/orcl_dup/tts01.dbf 2560
7 /u01/app/oracle/oradata/orcl_dup/tts02.dbf 2560
8 /u01/app/oracle/oradata/orcl_dup/undotbs001 12800
MAP
Map會透過偏移量來顯示block裡的詳細資訊，如block header，data block header 和row directory。 使用/v 選項，可以檢視更詳細的資訊。
在不指定block的情況下，會顯示當前block的資訊，如果想顯示其他block的資訊，可以使用file name，file id，block 和DBA 來指定要顯示的block。
BBED> map
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 682 Dba:0x010002aa
------------------------------------------------------------
BBED-00400: invalid blocktype (33)
User01.dbf的資料檔案第682上沒有資料，把block設定成上文中的692
BBED> set block +10
BLOCK# 692
BBED> map
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Dba:0x010002b4
------------------------------------------------------------
KTB Data Block (Table/Cluster)
struct kcbh, 20 bytes @0
struct ktbbh, 96 bytes @20
struct kdbh, 14 bytes @124
struct kdbt[1], 4 bytes @138
sb2 kdbr[2] @142
ub1 freespace[8018] @146
ub1 rowdata[24] @8164
ub4 tailchk @8188
用/v引數查詢指定的塊的詳細資訊
BBED> map /v dba 4,693
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 693 Dba:0x010002b5
------------------------------------------------------------
KTB Data Block (Index Leaf)
struct kcbh, 20 bytes @0
ub1 type_kcbh @0
ub1 frmt_kcbh @1
ub1 spare1_kcbh @2
ub1 spare2_kcbh @3
ub4 rdba_kcbh @4
ub4 bas_kcbh @8
ub2 wrp_kcbh @12
ub1 seq_kcbh @14
ub1 flg_kcbh @15
ub2 chkval_kcbh @16
ub2 spare3_kcbh @18
struct ktbbh, 72 bytes @20
ub1 ktbbhtyp @20
union ktbbhsid, 4 bytes @24
struct ktbbhcsc, 8 bytes @28
b2 ktbbhict @36
ub1 ktbbhflg @38
ub1 ktbbhfsl @39
ub4 ktbbhfnx @40
struct ktbbhitl[2], 48 bytes @44
struct kdxle, 32 bytes @100
struct kdxlexco, 16 bytes @100
b2 kdxlespl @116
sb2 kdxlende @118
ub4 kdxlenxt @120
ub4 kdxleprv @124
ub1 kdxledsz @128
ub1 kdxleunuse @129
b2 kd_off[239] @132
ub1 freespace[68] @610
ub1 rowdata[7450] @678
ub4 tailchk @8188
我們看到692和693的後四個部分及其相似，是因為oracleblocks 的最後4個bytes 是tail check。Oracleblock tail 由4個bytes組成，但實際上只用了低2個bytes來存放。 2個bytes的tail 由scn base，block type 和 scn sequence 組成。雖然tail check 由3個部分組成，但是oracle 把這3部分作為一個整體來儲存，並且佔用4個bytes。
DUMP
dump命令可以講block 的內從顯示到螢幕。 每次顯示的bytes由count 控制，預設是512 bytes。 使用 /v 選項，可以顯示更多詳細資訊。
BBED> dump /v dba 4,692 offset 0 count 200
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 0 to 199 Dba:0x010002b4
-------------------------------------------------------
06a20000 b4020001 21f71f00 00000204 l .?..?...!?......
04e50000 01000000 46df0000 20f71f00 l .?......F?..
00000000 03003200 b1020001 ffff0000 l ......2.?.......
00000000 00000000 00000000 00800000 l ................
20f71f00 00000000 00000000 00000000 l ?..............
00000000 00000000 00000000 00000000 l ................
00000000 00000000 00000000 00000000 l ................
00000000 00000000 00000000 00010200 l ................
ffff1600 681f521f 521f0000 0200761f l ....h.R.R.....v.
681f0000 00000000 00000000 00000000 l h...............
00000000 00000000 00000000 00000000 l ................
00000000 00000000 00000000 00000000 l ................
00000000 00000000 l ........
<16 bytes per line>
其中拿第一行的bytes為例，架構如下：
|
Type |
Format |
Unused |
RDBA |
SCN Base |
SCN Wrap |
Seq |
Flag |
|
06 |
a2 |
0000 |
b4020001 |
21f71f00 |
0000 |
02 |
03 |
print命令輸出data structures。 在使用print時，可以指定dba，block 等引數來限定輸出特定block。（縮寫是p）
BBED> print dba 4,693 offset 1
kcbh.frmt_kcbh
--------------
ub1 frmt_kcbh @1 0xa2
BBED> print dba 4,693 offset 20
ktbbh.ktbbhtyp
--------------
ub1 ktbbhtyp @20 0x02 (KDDBTINDEX)
使用map命令列出該塊的詳細資訊，注意上面列出的偏移量為1和20時的structures
BBED> map /v dba 4,693
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 693 Dba:0x010002b5
------------------------------------------------------------
KTB Data Block (Index Leaf)
struct kcbh, 20 bytes @0
ub1 type_kcbh @0
ub1 frmt_kcbh @1
ub1 spare1_kcbh @2
ub1 spare2_kcbh @3
ub4 rdba_kcbh @4
ub4 bas_kcbh @8
ub2 wrp_kcbh @12
ub1 seq_kcbh @14
ub1 flg_kcbh @15
ub2 chkval_kcbh @16
ub2 spare3_kcbh @18
struct ktbbh, 72 bytes @20
ub1 ktbbhtyp @20
union ktbbhsid, 4 bytes @24
struct ktbbhcsc, 8 bytes @28
b2 ktbbhict @36
ub1 ktbbhflg @38
ub1 ktbbhfsl @39
ub4 ktbbhfnx @40
struct ktbbhitl[2], 48 bytes @44
struct kdxle, 32 bytes @100
struct kdxlexco, 16 bytes @100
b2 kdxlespl @116
sb2 kdxlende @118
ub4 kdxlenxt @120
ub4 kdxleprv @124
ub1 kdxledsz @128
ub1 kdxleunuse @129
b2 kd_off[239] @132
ub1 freespace[68] @610
ub1 rowdata[7450] @678
ub4 tailchk @8188
透過print structname檢視一下指定struct對照關係
BBED> print kcbh
struct kcbh, 20 bytes @0
ub1 type_kcbh @0 0x06
ub1 frmt_kcbh @1 0xa2
ub1 spare1_kcbh @2 0x00
ub1 spare2_kcbh @3 0x00
ub4 rdba_kcbh @4 0x010002b4
ub4 bas_kcbh @8 0x001ff721
ub2 wrp_kcbh @12 0x0000
ub1 seq_kcbh @14 0x02
ub1 flg_kcbh @15 0x04 (KCBHFCKV)
ub2 chkval_kcbh @16 0xe504
ub2 spare3_kcbh @18 0x0000
BBED> print ktbbh
struct ktbbh, 96 bytes @20
ub1 ktbbhtyp @20 0x01 (KDDBTDATA)
union ktbbhsid, 4 bytes @24
ub4 ktbbhsg1 @24 0x0000df46
ub4 ktbbhod1 @24 0x0000df46
struct ktbbhcsc, 8 bytes @28
ub4 kscnbas @28 0x001ff720
ub2 kscnwrp @32 0x0000
b2 ktbbhict @36 3
ub1 ktbbhflg @38 0x32 (NONE)
ub1 ktbbhfsl @39 0x00
ub4 ktbbhfnx @40 0x010002b1
struct ktbbhitl[0], 24 bytes @44
struct ktbitxid, 8 bytes @44
ub2 kxidusn @44 0xffff
ub2 kxidslt @46 0x0000
ub4 kxidsqn @48 0x00000000
struct ktbituba, 8 bytes @52
ub4 kubadba @52 0x00000000
ub2 kubaseq @56 0x0000
ub1 kubarec @58 0x00
ub2 ktbitflg @60 0x8000 (KTBFCOM)
union _ktbitun, 2 bytes @62
b2 _ktbitfsc @62 0
ub2 _ktbitwrp @62 0x0000
ub4 ktbitbas @64 0x001ff720
struct ktbbhitl[1], 24 bytes @68
struct ktbitxid, 8 bytes @68
ub2 kxidusn @68 0x0000
ub2 kxidslt @70 0x0000
ub4 kxidsqn @72 0x00000000
struct ktbituba, 8 bytes @76
ub4 kubadba @76 0x00000000
ub2 kubaseq @80 0x0000
ub1 kubarec @82 0x00
ub2 ktbitflg @84 0x0000 (NONE)
union _ktbitun, 2 bytes @86
b2 _ktbitfsc @86 0
ub2 _ktbitwrp @86 0x0000
ub4 ktbitbas @88 0x00000000
struct ktbbhitl[2], 24 bytes @92
struct ktbitxid, 8 bytes @92
ub2 kxidusn @92 0x0000
ub2 kxidslt @94 0x0000
ub4 kxidsqn @96 0x00000000
struct ktbituba, 8 bytes @100
ub4 kubadba @100 0x00000000
ub2 kubaseq @104 0x0000
ub1 kubarec @106 0x00
ub2 ktbitflg @108 0x0000 (NONE)
union _ktbitun, 2 bytes @110
b2 _ktbitfsc @110 0
ub2 _ktbitwrp @110 0x0000
ub4 ktbitbas @112 0x00000000
反過來透過structure來print出具體的位移量
BBED> print ktbbhtyp
ub1 ktbbhtyp @20 0x01 (KDDBTDATA)
當print 一個data structure 時，輸出的格式如下
BBED> p kdbr
sb2 kdbr[0] @142 8054
sb2 kdbr[1] @144 8040
從結果中可以看出，該資料塊有兩條記錄，每行的pointer需要2個位元組來儲存，可以x顯示*kdbr[0]值得到該資料塊對應的內容
BBED> p *kdbr[0]
rowdata[14]
-----------
ub1 rowdata[14] @8178 0x2c
Dump出該資料塊的具體資訊
BBED> dump /v dba 4,692 offset 8178 count 200
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8178 to 8191 Dba:0x010002b4
-------------------------------------------------------
2c000106 31323334 35360206 21f7 l ,...123456..!?
<16 bytes per line>
既然知道了offset，也可以直接輸出絕對的offset內容（/d是以十進位制格式輸出）
BBED> p /d offset 8178
rowdata[14]
-----------
ub1 rowdata[14] @8178 44
EXAMINE
examine命令也是用來顯示datablock的內容（簡寫x），該命令可以跟print結合到一起對資料庫和資料庫中的資料進行對照說明。
BBED> show
FILE# 4
BLOCK# 692
OFFSET 8164
DBA 0x010002b4 (16777908 4,692)
FILENAME /u01/app/oracle/oradata/orcl_dup/users01.dbf
BIFILE bifile.bbd
LISTFILE /u01/bbedlist.parf
BLOCKSIZE 8192
MODE Edit
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 200
LOGFILE log.bbd
SPOOL No
SQL> select job,dbms_rowid.rowid_block_number(rowid)blockno from bbed_test;
JOB BLOCKNO
------------------------- ----------
123456 692
1234567890 692
BBED> p *kdbr[0]
rowdata[14]
-----------
ub1 rowdata[14] @8178 0x2c
BBED> x /rcnn
rowdata[14] @8178
-----------
flag@8178: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8179: 0x00
cols@8180: 1
col 0[6] @8181: 123456
BBED> x /rcnn
rowdata[0] @8164
----------
flag@8164: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8165: 0x00
cols@8166: 1
col 0[10] @8167: 1234567890
examine也可以多行顯示
比如：
BBED> p kdbhnrow
b2 kdbhnrow @126 2
該資料塊一共有兩條記錄，將print指向最後一個row
BBED> p *kdbr[1]
rowdata[0]
----------
ub1 rowdata[0] @8164 0x2c
BBED> x /2rcnn
rowdata[0] @8164
----------
flag@8164: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8165: 0x00
cols@8166: 1
col 0[10] @8167: 1234567890
rowdata[14] @8178
-----------
flag@8178: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8179: 0x00
cols@8180: 1
col 0[6] @8181: 123456
FIND
find命令可以用來搜尋關鍵字。 可以從offset 0 搜尋到top 或者從當前的offset 搜尋到top。（縮寫f）
SQL> select job,dbms_rowid.rowid_block_number(rowid)blockno from bbed_test;
JOB BLOCKNO
------------------------- ----------
123456 692
1234567890 692
Find命令查詢123456命令
BBED> find /c 123456 top
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8168 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
31323334 35363738 39302c00 01063132 33343536 020621f7
<32 bytes per line>
Dump出該offset的資料看看
BBED> dump /v dba 4,692 offset 8168 count 200
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8168 to 8191 Dba:0x010002b4
-------------------------------------------------------
31323334 35363738 39302c00 01063132 l 1234567890,...12
33343536 020621f7 l 3456..!
如果想要接著搜尋，可以再次輸入find即可
BBED> set offset 0
OFFSET 0
BBED> find /c 123 top
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8168 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
31323334 35363738 39302c00 01063132 33343536 020621f7
<32 bytes per line>
BBED> find
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
31323334 35360206 21f7
<32 bytes per line>
BBED> find
BBED-00212: search string not found
copy用來複制資料塊，不要隨便copy資料庫！
BBED> copy dba 4,691 to dba 4,692
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
00000000 00000123 23f7
<32 bytes per line>
SQL> alter system flush buffer_cache;
System altered.
SQL> conn scott/oracle
Connected.
SQL> select * from bbed_test;
select * from bbed_test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 692)
ORA-01110: data file 4: '/u01/app/oracle/oradata/orcl_dup/users01.dbf'
REVERT
revert是恢復自bbed 啟動以來的所有修改。
BBED> revert dba 4,692
All changes made to this block will be rolled back. Proceed? (Y/N) Y
Reverted file '/u01/app/oracle/oradata/orcl_dup/users01.dbf', block 692
SQL> alter system flush buffer_cache;
System altered.
SQL> conn scott/oracle
Connected.
SQL> select * from bbed_test;
JOB
-------------------------
123456
1234567890
MODIFY
modify用來修改資料庫資訊（縮寫m）
BBED> modify /c 654321 dba 4,692 offset 8182
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
36353433 32310206 21f7
<32 bytes per line>
BBED> dump /v dba 4,692 offset 8182
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
-------------------------------------------------------
36353433 32310206 21f7 l 654321..!?
<16 bytes per line>
VERIFY
此時查詢資料是無法查詢的，此時的塊由於更改處於損壞狀態
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
Block 692 is corrupt
Corrupt block relative dba: 0x010002b4 (file 0, block 692)
Bad check value found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x010002b4
last change scn: 0x0000.001ff721 seq: 0x2 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0xf7210602
check value in block header: 0xe504
computed block checksum: 0x101
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 0
SQL> select * from bbed_test; //查詢前別忘了清理一下cache alter system flush buffer_cache;
select * from bbed_test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 692)
ORA-01110: data file 4: '/u01/app/oracle/oradata/orcl_dup/users01.dbf'
sum apply使對塊的修改生效，sum 後跟引數apply是為了即時生效
BBED> sum dba 4,692 apply
Check value for File 4, Block 692:
current = 0xe405, required = 0xe405
此時在檢查該塊，發現塊已經正常
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
去資料庫檢視一下，資料已經更改成功
SQL> alter system flush buffer_cache;
System altered.
SQL> conn scott/oracle
Connected.
SQL> select * from bbed_test;
JOB
-------------------------
123456
0987654321
UNDO
undo命令用來回滾最後一次的操作
更改一個資料
BBED> dump /v offset 8182
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
-------------------------------------------------------
31323334 35360206 21f7 l 123456..!?
<16 bytes per line>
BBED> modify /x 654321 dba 4,692 offset 8182
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
65432134 35360206 21f7
<32 bytes per line>
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
Block 692 is corrupt
Corrupt block relative dba: 0x010002b4 (file 0, block 692)
Bad check value found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x010002b4
last change scn: 0x0000.001ff721 seq: 0x2 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0xf7210602
check value in block header: 0xe504
computed block checksum: 0x7146
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 0
BBED> sum dba 4,692 apply;
Check value for File 4, Block 692:
current = 0x9442, required = 0x9442
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
資料庫中可以檢視更改
SQL> alter system flush buffer_cache;
System altered.
SQL> conn scott/oracle
Connected.
SQL> select * from bbed_test;
JOB
-------------------------
eC!456
1234567890
使用undo回滾
BBED> undo
BBED> modify /x 313233 filename '/u01/app/oracle/oradata/orcl_dup/users01.dbf' block 692. offset 8182.
File: /u01/app/oracle/oradata/orcl_dup/users01.dbf (4)
Block: 692 Offsets: 8182 to 8191 Dba:0x010002b4
------------------------------------------------------------------------
31323334 35360206 21f7
<32 bytes per line>
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
Block 692 is corrupt
Corrupt block relative dba: 0x010002b4 (file 0, block 692)
Bad check value found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x010002b4
last change scn: 0x0000.001ff721 seq: 0x2 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0xf7210602
check value in block header: 0x9442
computed block checksum: 0x7146
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 0
BBED> sum dba 4,692 apply;
Check value for File 4, Block 692:
current = 0xe504, required = 0xe504
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl_dup/users01.dbf
BLOCK = 692
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
資料庫中再次檢視資料已經回滾
SQL> alter system flush buffer_cache;
System altered.
SQL> conn scott/oracle
Connected.
SQL> select * from bbed_test;
JOB
-------------------------
123456
1234567890
其他命令此處不一一測試，主要的命令也就上面那麼多了。
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/29320885/viewspace-1216978/，如需轉載，請註明出處，否則將追究法律責任。
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