關于Dump redo log 的示例，MOS 上的文檔：[ID 1031381.6] 有詳細說明。Dump 有兩種方式：(1)使用

一. dump redo 說明

關于Dump redo log 的示例，MOS 上的文檔：[ID 1031381.6] 有詳細說明。Dump 有兩種方式：

(1)使用'alter session' 命令dumpredo header。

(2)使用'alter system dump logfile' 命令dump logfile contents。

可以在mount，nomout和open狀態下使用如上命令，，并且使用以上命令需要'alter system' 的權限。 可以使用該命令dump onlie redo log 或者歸檔文件。 當操作系統系統相同的情況下，還可以dump其他db的log 文件。

有如下dump 方法：

1.To dump records based in DBA (Data Block Address)

2.To dump records based on RBA (Redo Block Address)

3.To dump records based on SCN

4.To dump records based on time

5.To dump records based on layer and opcode

6.Dump the file header information

7.Dump an entire log file:

二. 具體使用示例

2.1 ?To dump records based on DBA? (Data Block Address)

關于DBA的說明，參考：

Oracle rdba和 dba 說明

根據DBA進行dump，主要是根據file和block 號來進行dump。 這個的block 是一個范圍值。

11g命令格式如下：

ALTER SYSTEM DUMP LOGFILE 'filename'? DBA MIN fileno . blockno??? DBA MAX fileno . blockno;

如果是Oracle 10g，需要省略'.'，即格式如下：

ALTER SYSTEM DUMP LOGFILE 'filename' ?DBA MIN fileno ?blockno ???DBA MAX fileno ?blockno;

否則會報：? ORA-01963: Must specify a block number 錯誤。

如：

SYS@anqing1(rac1)> select * fromv$version where rownum=1;

BANNER

----------------------------------------------------------------

Oracle Database 10g Enterprise EditionRelease 10.2.0.4.0 - Prod

SQL>select distinct dbms_rowid.rowid_relative_fno(rowid) rel_fno,

dbms_rowid.rowid_block_number(rowid)blockno from ta;

REL_FNO??? BLOCKNO

---------- ----------

1???? 294608

1???? 294609

1???? 294612

1 ????294614

1???? 294621

1???? 294635

1???? 294643

1???? 294654

1???? 294656

1???? 294657

6????? 10385

REL_FNO??? BLOCKNO

---------- ----------

6????? 10393

6????? 10410

6?????10411

6????? 10415

6????? 10416

6????? 10458

6????? 10461

6????? 10464

6????? 10465

6????? 10468

6????? 10472

確定log file 位置：

SYS@anqing1(rac1)> selecta.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;

GROUP# STATUS?????????? MEMBER

---------- --------------------------------------------------------------------

3 INACTIVE???????? +DATA/anqing/onlinelog/redo03.log

2 INACTIVE????????+DATA/anqing/onlinelog/redo02.log

1 CURRENT?????????+DATA/anqing/onlinelog/group_1.277.751552735

1 CURRENT?????????+FRA/anqing/onlinelog/group_1.426.751552739

4 CURRENT?????????+DATA/anqing/onlinelog/group_4.282.751560131

5 INACTIVE????????+DATA/anqing/onlinelog/group_5.283.751560139

6 rows selected.

SYS@anqing1(rac1)> alter system dump logfile'+data/anqing/onlinelog/redo02.log'? dbamin 6? 10458??? dba max 6?10472;

System altered.

SYS@anqing1(rac1)> oradebug setmypid

Statement processed.

SYS@anqing1(rac1)> oradebug tracefile_name

/u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trc

SYS@anqing1(rac1)>

[oracle@rac1 ~]$cat /u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trc

/u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trc

Oracle Database 10g Enterprise EditionRelease 10.2.0.4.0 - Production

With the Partitioning, Real ApplicationClusters, OLAP, Data Mining

and Real Application Testing options

ORACLE_HOME =/u01/app/oracle/product/10.2.0/db_1

System name:??? Linux

Node name:????? rac1

Release:??????? 2.6.18-194.el5

Version:??????? #1 SMP Tue Mar 16 21:52:43 EDT 2010

Machine:??????? i686

Instance name: anqing1

Redo thread mounted by this instance: 1

Oracle process number: 28

Unix process pid: 30373, image: oracle@rac1(TNS V1-V3)

*** 2011-08-08 22:10:37.053

*** ACTION NAME:() 2011-08-08 22:10:37.052

*** MODULE NAME:(sqlplus@rac1 (TNS V1-V3))2011-08-08 22:10:37.052

*** SERVICE NAME:(SYS$USERS) 2011-08-0822:10:37.052

*** SESSION ID:(127.27077) 2011-08-0822:10:37.052

DUMP OF REDO FROM FILE'+data/anqing/onlinelog/redo02.log'

Opcodes *.*

DBAs: (file # 6, block # 10458) thru (file #6, block # 10472)

RBAs: 0x000000.00000000.0000 thru0xffffffff.ffffffff.ffff

SCNs: scn: 0x0000.00000000 thru scn:0xffff.ffffffff

Times: creation thru eternity

FILEHEADER:

Compatibility Vsn = 169870336=0xa200400

Db ID=715014091=0x2a9e3fcb, Db

Activation ID=682502900=0x28ae2af4

Control Seq=4261=0x10a5, File size=102400=0x19000

File Number=2, Blksiz=512, File Type=2 LOG

descrip:"Thread0001, Seq# 0000000119, SCN 0x0000006ab1bc-0x0000006e0c84"

thread: 1 nab: 0x18ffd seq: 0x00000077 hws:0x2 eot: 0 dis: 0

resetlogs count: 0x2ccbc8df scn:0x0000.000704fa (460026)

resetlogs terminal rcv count: 0x0 scn:0x0000.00000000

prevresetlogs count: 0x2ebbfe8f scn: 0x0000.0006ce7b (446075)

prevresetlogs terminal rcv count: 0x0 scn: 0x0000.00000000

Low?scn: 0x0000.006ab1bc (6992316) 07/30/2011 05:39:17

Nextscn: 0x0000.006e0c84 (7212164) 08/03/2011 14:14:34

Enabled scn: 0x0000.000704fa (460026)05/19/2011 12:38:55

Thread closed scn: 0x0000.006ab1bc (6992316)07/30/2011 05:39:17

Diskcksum: 0xd530 Calc cksum: 0xd530

Terminal recovery stop scn: 0x0000.00000000

Terminal recovery? 01/01/1988 00:00:00

Mostrecent redo scn: 0x0000.00000000

Largest LWN: 1874 blocks

End-of-redo stream : No

Unprotected mode

Miscellaneous flags: 0x0

Thread internal enable indicator: thr: 0, seq:0 scn: 0x0000.00000000

REDO RECORD - Thread:1 RBA:0x000077.00000cd6.017c LEN: 0x0048 VLD: 0x01

SCN: 0x0000.006ac8a9 SUBSCN:? 1 07/30/2011 08:28:08

CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ:? 0 OP:18.3

Reuse redo entry

Range reuse: tsn=1 base=8542185 nblks=8

REDO RECORD - Thread:1 RBA:0x000077.00006e99.0078 LEN: 0x0044 VLD: 0x01

SCN: 0x0000.006b7ae1 SUBSCN:? 1 07/31/2011 06:18:10

CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ:? 0 OP:17.4

Datafile resize marker - file: 2 old size:153600 new size: 156160

REDO RECORD - Thread:1 RBA:0x000077.00007884.017c LEN: 0x0048 VLD: 0x01

SCN: 0x0000.006b8d16 SUBSCN:? 1 07/31/2011 08:33:09

CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ:? 0 OP:18.3

Reuse redo entry

Range reuse: tsn=1 base=8542217 nblks=1024

*** 2011-08-08 22:10:54.783

END OF REDO DUMP

----- Redo read statistics for thread 1-----

Read rate (ASYNC): 51197Kb in 17.78s =>2.81 Mb/sec

Total physical reads: 51197Kb

Longest record: 8Kb, moves: 0/85186 (0%)

Change moves: 30223/143291 (21%), moved:5Mb

Longest LWN: 937Kb, moves: 6/66426 (0%),moved: 0Mb

Last redo scn: 0x0000.006e087b (7211131)

----------------------------------------------

[oracle@rac1 ~]$

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