小编给大家分享一下如何使用bbed恢复delete的rows，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
实验如下：
1.创建环境表DVD
SQL> conn hr/hr;
Connected.
SQL>
SQL> create table dvd(job varchar2(100));
Table created.
SQL> insert into dvd values('Dave is DBA!');
1 row created.
SQL> insert into dvd values('Dave like Oracle!');
1 row created.
SQL> commit;
Commit complete.
SQL> conn / as sysdba
Connected.
SQL>
SQL> set lines 200
SQL> select OWNER,TABLE_NAME,TABLESPACE_NAME from dba_tables where table_name='DVD';
OWNER TABLE_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
HR DVD USERS2.查询dvd相关file/block信息；
SQL> select rowid,dbms_rowid.rowid_relative_fno(rowid) rel_fno,dbms_rowid.rowid_block_number(rowid) blockno,dbms_rowid.rowid_row_number(rowid) rowno,a.* from dvd a; ROWID REL_FNO BLOCKNO ROWNO JOB ------------------ ---------- ---------- ---------- ---------------------------------------------------------------------------------------------------- AAAV8YAAEAAAAIPAAA 4 527 0 Dave is DBA! AAAV8YAAEAAAAIPAAB 4 527 1 Dave like Oracle! SQL> --新开一个窗口执行dump块查询信息 oracle@wang ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Tue Nov 28 14:31:49 2017 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> alter system dump datafile 4 block 527; System altered. SQL> oradebug setmypid Statement processed. SQL> SQL> oradebug tracefile_name /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2013.trc SQL> --查看trace： [oracle@wang ~]$ more /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2013.trc Trace file /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2013.trc Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1 System name: Linux Node name: wang Release: 3.10.0-327.el7.x86_64 Version: #1 SMP Thu Oct 29 17:29:29 EDT 2015 Machine: x86_64 Instance name: DBdb Redo thread mounted by this instance: 1 Oracle process number: 27 Unix process pid: 2013, image: oracle@wang (TNS V1-V3) *** 2017-11-28 14:31:56.277 *** SESSION ID:(40.13) 2017-11-28 14:31:56.277 *** CLIENT ID:() 2017-11-28 14:31:56.277 *** SERVICE NAME:(SYS$USERS) 2017-11-28 14:31:56.277 *** MODULE NAME:(sqlplus@wang (TNS V1-V3)) 2017-11-28 14:31:56.277 *** ACTION NAME:() 2017-11-28 14:31:56.277 Start dump data blocks tsn: 4 file#:4 minblk 527 maxblk 527 Block dump from cache: Dump of buffer cache at level 4 for tsn=4 rdba=16777743 BH (0x89ff27e8) file#: 4 rdba: 0x0100020f (4/527) class: 1 ba: 0x89eee000 set: 3 pool: 3 bsz: 8192 bsi: 0 sflg: 2 pwc: 0,0 dbwrid: 0 obj: 89880 objn: 89880 tsn: 4 afn: 4 hint: f hash: [0x8fe6a618,0x87fd9a18] lru: [0x89ff2a10,0x89ff27a0] ckptq: [NULL] fileq: [NULL] objq: [0x89ff2a38,0x8b4e5e60] objaq: [0x89ff2a48,0x8b4e5e50] st: XCURRENT md: NULL fpin: 'ktspbwh3: ktspfmdb' tch: 5 flags: block_written_once redo_since_read LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [1] Block dump from disk: buffer tsn: 4 rdba: 0x0100020f (4/527) scn: 0x0000.0039530d seq: 0x01 flg: 0x06 tail: 0x530d0601 frmt: 0x02 chkval: 0x9014 type: 0x06=trans data Hex dump of block: st=0, typ_found=1 Dump of memory from 0x00007F3C1C8B7A00 to 0x00007F3C1C8B9A00 7F3C1C8B7A00 0000A206 0100020F 0039530D 06010000 [.........S9.....] 7F3C1C8B7A10 00009014 00000001 00015F18 00395308 [........._...S9.] 7F3C1C8B7A20 00000000 00320002 01000208 00160002 [......2.........] 7F3C1C8B7A30 000005FA 00C3D82B 00180272 00002002 [....+...r.... ..] 7F3C1C8B7A40 0039530D 00000000 00000000 00000000 [.S9.............] 7F3C1C8B7A50 00000000 00000000 00000000 00000000 [................] 7F3C1C8B7A60 00000000 00020100 0016FFFF 1F5D1F73 [............s.].] 7F3C1C8B7A70 00001F5D 1F880002 00001F73 00000000 [].......s.......] 7F3C1C8B7A80 00000000 00000000 00000000 00000000 [................] Repeat 500 times 7F3C1C8B99D0 00000000 2C000000 44110101 20657661 [.......,...Dave ] 7F3C1C8B99E0 656B696C 61724F20 21656C63 0C01012C [like Oracle!,...] 7F3C1C8B99F0 65766144 20736920 21414244 530D0601 [Dave is DBA!...S] Block header dump: 0x0100020f Object id on Block? Y seg/obj: 0x15f18 csc: 0x00.395308 itc: 2 flg: E typ: 1 - DATA brn: 0 bdba: 0x1000208 ver: 0x01 opc: 0 inc: 0 exflg: 0 Itl Xid Uba Flag Lck Scn/Fsc 0x01 0x0002.016.000005fa 0x00c3d82b.0272.18 --U- 2 fsc 0x0000.0039530d 0x02 0x0000.000.00000000 0x00000000.0000.00 ---- 0 fsc 0x0000.00000000 bdba: 0x0100020f data_block_dump,data header at 0x7f3c1c8b7a64 =============== tsiz: 0x1f98 hsiz: 0x16 pbl: 0x7f3c1c8b7a64 76543210 flag=-------- ntab=1 nrow=2 frre=-1 fsbo=0x16 fseo=0x1f73 avsp=0x1f5d tosp=0x1f5d 0xe:pti[0] nrow=2 offs=0 0x12:pri[0] offs=0x1f88 0x14:pri[1] offs=0x1f73 block_row_dump: tab 0, row 0, @0x1f88 tl: 16 fb: --H-FL-- lb: 0x1 cc: 1 col 0: [12] 44 61 76 65 20 69 73 20 44 42 41 21 tab 0, row 1, @0x1f73 tl: 21 fb: --H-FL-- lb: 0x1 cc: 1 col 0: [17] 44 61 76 65 20 6c 69 6b 65 20 4f 72 61 63 6c 65 21 end_of_block_dump End dump data blocks tsn: 4 file#: 4 minblk 527 maxblk 527 *** 2017-11-28 14:31:57.368 Processing Oradebug command 'setmypid' *** 2017-11-28 14:31:57.368 Oradebug command 'setmypid' console output: *** 2017-11-28 14:32:00.927 Processing Oradebug command 'tracefile_name' *** 2017-11-28 14:32:00.927 Oradebug command 'tracefile_name' console output: /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2013.trc [oracle@wang ~]$
我们的表dvd里只有2行记录，所以这里显示的row 为2.
注意这里的fb: --H-FL--。 其有8个选项，每个值分别与bitmask 对应。
Therefore,columns that fit within a single block, are not chained, migrated or part of aclustered table and are not deleted will have the following attributes: （1）Head of Row Piece （2）First Data Piece （3）Last Data Piece
如果一个row 没有被删除，那么它就具有上面的3个属性，即Flag 表示为：--H-FL--. 这里的字母分别代表属性的首字母。其对应的值：32 + 8 + 4 =44 or 0x2c.
如果一个row 被delete了，那么row flag 就会更新，bitmask 里的deleted 被设置为16. 此时row flag 为： 32 + 16 + 8 + 4 = 60 or 0x3c.
--验证一下：
SQL> select rowid,dbms_rowid.rowid_relative_fno(rowid) rel_fno,dbms_rowid.rowid_block_number(rowid) blockno,dbms_rowid.rowid_row_number(rowid) rowno from dvd; ROWID REL_FNO BLOCKNO ROWNO ------------------ ---------- ---------- ---------- AAAV84AAEAAAAIPAAA 4 527 0 AAAV84AAEAAAAIPAAB 4 527 1 SQL> select * from dvd; JOB -------------------------------------------------------------------------------- Dave is DBA! Dave like Oracle! SQL> delete from dvd where rownum=1; 1 row deleted. SQL> commit; Commit complete. SQL> select * from dvd; JOB -------------------------------------------------------------------------------- Dave like Oracle!
--再次查看dump 的标记：
[oracle@wang ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Tue Nov 28 14:36:29 2017 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options
--需先flush buffer_cache清空buffer：
SQL> alter system flush buffer_cache; System altered. SQL> alter system dump datafile 4 block 527; System altered. SQL> SQL> oradebug setmypid Statement processed. SQL> SQL> oradebug tracefile_name /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2065.trc SQL> SQL>
--再次查看trace文件：
[oracle@wang ~]$ more /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2065.trc block_row_dump: tab 0, row 0, @0x1f88 tl: 2 fb: --HDFL-- lb: 0x2 ---注意由-H-FL变为-HdFL tab 0, row 1, @0x1f73 tl: 21 fb: --H-FL-- lb: 0x0 cc: 1 col 0: [17] 44 61 76 65 20 6c 69 6b 65 20 4f 72 61 63 6c 65 21 end_of_block_dump End dump data blocks tsn: 4 file#: 4 minblk 527 maxblk 527 *** 2017-11-28 14:36:42.754 Processing Oradebug command 'setmypid' *** 2017-11-28 14:36:42.754 Oradebug command 'setmypid' console output: *** 2017-11-28 14:36:48.261 Processing Oradebug command 'tracefile_name' *** 2017-11-28 14:36:48.262 Oradebug command 'tracefile_name' console output: /u01/app/oracle/diag/rdbms/dbdb/DBdb/trace/DBdb_ora_2065.trc [oracle@wang ~]$
这里的row 1flag 变成了--HDFL--
3.2 现在我们用bbed 将删除的row 1 内容找回来
--编辑BBED的PARFILE参数文件
先查看数据文件
SQL> select file#||' '||name||' '||bytes from v$datafile ; FILE#||''||NAME||''||BYTES -------------------------------------------------------------------------------- 1 /u01/app/oracle/oradata/DBdb/system01.dbf 2936012800 2 /u01/app/oracle/oradata/DBdb/sysaux01.dbf 723517440 3 /u01/app/oracle/oradata/DBdb/undotbs01.dbf 2710568960 4 /u01/app/oracle/oradata/DBdb/users01.dbf 3207331840 5 /u01/app/oracle/oradata/DBdb/example01.dbf 355205120
--进入bbed窗口
--配置BBED参数文件parfile
--编辑listfile
[oracle@wang ~]$ vi filelist.txt 1 /u01/app/oracle/oradata/DBdb/system01.dbf 2936012800 2 /u01/app/oracle/oradata/DBdb/sysaux01.dbf 723517440 3 /u01/app/oracle/oradata/DBdb/undotbs01.dbf 2710568960 4 /u01/app/oracle/oradata/DBdb/users01.dbf 3207331840 5 /u01/app/oracle/oradata/DBdb/example01.dbf 355205120 filelist.txt [New] 6L, 275C written [oracle@wang ~]$ --编辑parfile： [oracle@wang ~]$ vi bbed.par blocksize=8192 listfile=/home/oracle/filelist.txt mode=edit ~ bbed.par [New] 3L, 60C written [oracle@wang ~]$ --进入bbed窗口 [oracle@wang ~]$ bbed parfile=/home/oracle/bbed.par Password: blockedit BBED: Release 2.0.0.0.0 - Limited Production on Tue Nov 28 15:02:40 2017 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. ************* !!! For Oracle Internal Use only !!! *************** BBED> show all FILE# 1 BLOCK# 1 OFFSET 0 DBA 0x00400001 (4194305 1,1) FILENAME /u01/app/oracle/oradata/DBdb/system01.dbf BIFILE bifile.bbd LISTFILE /home/oracle/filelist.txt BLOCKSIZE 8192 MODE Edit EDIT Unrecoverable IBASE Dec OBASE Dec WIDTH 80 COUNT 512 LOGFILE log.bbd SPOOL No
--修改指定到文件4，块527：
BED> set dba 4,527 offset 0 DBA 0x0100020f (16777743 4,527) OFFSET 0 BBED> show all FILE# 4 BLOCK# 527 OFFSET 0 DBA 0x0100020f (16777743 4,527) FILENAME /u01/app/oracle/oradata/DBdb/users01.dbf BIFILE bifile.bbd LISTFILE /home/oracle/filelist.txt BLOCKSIZE 8192 MODE Edit EDIT Unrecoverable IBASE Dec OBASE Dec WIDTH 80 COUNT 512 LOGFILE log.bbd SPOOL No
--查找Dave所在位置
BBED> find /c Dave File: /u01/app/oracle/oradata/DBdb/users01.dbf (4) Block: 527 Offsets: 8155 to 8191 Dba:0x0100020f ------------------------------------------------------------------------ 44617665 206c696b 65204f72 61636c65 213c0201 0c446176 65206973 20444241 210206e0 53 <32 bytes= per= line=>
--翻译其数据
BBED> d /v dba 4,527 offset 8155 File: /u01/app/oracle/oradata/DBdb/users01.dbf (4) Block: 527 Offsets: 8155 to 8191 Dba:0x0100020f ------------------------------------------------------- 44617665 206c696b 65204f72 61636c65 l Dave like Oracle 213c0201 0c446176 65206973 20444241 l !<...Dave is DBA 210206e0 53 l !...S <16 bytes= per= line=>
--前后迁移offset偏移量，发现在offset在8156时发现3c标志
BBED> d /v dba 4,527 offset 8156 File: /u01/app/oracle/oradata/DBdb/users01.dbf (4) Block: 527 Offsets: 8156 to 8191 Dba:0x0100020f ------------------------------------------------------- 61766520 6c696b65 204f7261 636c6521 l ave like Oracle! 3c02010c 44617665 20697320 44424121 l <...Dave is DBA! 0206e053 l ...S <16 bytes= per= line=>
这里已经出现了我们3c（deleted）标志，但是注意这里的位置的根据我们的查找的字符串来分的，实际在block里的分割方式不一样按照我们的offset 来进行。 我们可以通过row directory 来进行一个确认。
--print row directory 确认一下
BBED> p kdbr sb2 kdbr[0] @118 8072 sb2 kdbr[1] @120 8051 BBED> p *kdbr[0] rowdata[21] ----------- ub1 rowdata[21] @8172 0x3c BBED> p *kdbr[1] rowdata[0] ---------- ub1 rowdata[0] @8151 0x2c
通过row directory，我们可以确认对应row记录的row header保存在offset 8172的位置，值为3c。 我们find 字符串的目的就是为了和rowdirectory 中的offset 进行比较。 他们相近时，就可以确定。
--现在我们将@8172位置的3c 变成2c。 即从deleted 变成正常
BBED> modify /x 2c offset 8172 File: /u01/app/oracle/oradata/DBdb/users01.dbf (4) Block: 527 Offsets: 8172 to 8191 Dba:0x0100020f ------------------------------------------------------------------------ 2c02010c 44617665 20697320 44424121 0206e053 <32 bytes= per= line=> --应用更改： BBED> sum apply Check value for File 4, Block 527: current = 0xf25d, required = 0xf25d BBED> --flush buffer cache，然后查询 SQL> conn / as sysdba Connected. SQL> alter system flush buffer_cache; System altered. SQL> conn hr/hr; Connected. SQL> select * from dvd; JOB -------------------------------------------------------------------------------- Dave is DBA! Dave like Oracle!
以上是“如何使用bbed恢复delete的rows”这篇文章的所有内容，感谢各位的阅读！
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