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oracle中dump logfile方法有哪些
更新：HHH 时间：2023-1-7

这篇文章将为大家详细讲解有关oracle中dump logfile方法有哪些，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

dump logfile

有时工作需要可能需要dump redo logfile，帮助解决问题。

这个命令需要alter system系统权限。

数据库可以是在nomount,mount,open状态。

可以dump在线redo log，也可以dump归档文件。

甚至可以dump其他数据的文件，但是操作系统要一致。

dump的几种方法：

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:

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

ALTER SYSTEM DUMP LOGFILE 'filename'

DBA MIN fileno . blockno

DBA MAX fileno . blockno;

dump出指定范围数据块的redo记录。

数据库版本：

SQL> !sqlplus -V

SQL*Plus: Release 11.2.0.1.0 Production

SQL> sho user

USER is "MING"

SQL> set line 300

SQL> col b for a30

SQL> select dbms_rowid.rowid_relative_fno(rowid) file_id,
dbms_rowid.rowid_block_number(rowid) block_id,rowid,
test.* from test;

FILE_ID BLOCK_ID ROWID A B

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

7 1683 AAASZ2AAHAAAAaTAAA 1 ming

更新一行：

SQL> update test set b='mingshuomingshuo' where a=1;

1 row updated.

SQL> select lg.group#,lg.sequence#,lg.bytes/1024/1024/1024 G,
lg.members,lgf.member,lg.archived,
lg.status from v$log lg,v$logfile lgf where lg.group#=lgf.group#;

GROUP# SEQUENCE# G MEMBERS MEMBER ARC STATUS

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

3 36 .048828125 1 /tpdata/oradata/ogg1/redo03.log NO CURRENT

2 35 .048828125 1 /tpdata/oradata/ogg1/redo02.log YES INACTIVE

1 34 .048828125 1 /tpdata/oradata/ogg1/redo01.log YES INACTIVE

SQL> alter system dump logfile '/tpdata/oradata/ogg1/redo03.log' dba min 7 1683 dba max 7 1683;

System altered.

SQL> select tracefile from v$process where addr in (
select paddr from v$session where sid in (select sid from v$mystat));

TRACEFILE

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

/tpsys/app/oracle/diag/rdbms/ogg1/ogg1/trace/ogg1_ora_2647.trc

[oracle@oggtest1 ~]$ more /tpsys/app/oracle/diag/rdbms/ogg1/ogg1/trace/ogg1_ora_2647.trc

Trace file /tpsys/app/oracle/diag/rdbms/ogg1/ogg1/trace/ogg1_ora_2647.trc

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /tpsys/app/oracle/product/11.2.0/db_1

System name: Linux

Node name: oggtest1

Release: 2.6.32-358.el6.x86_64

Version: #1 SMP Tue Jan 29 11:47:41 EST 2013

Machine: x86_64

Instance name: ogg1

Redo thread mounted by this instance: 1

Oracle process number: 29

Unix process pid: 2647, image: oracle@oggtest1 (TNS V1-V3)

*** 2018-05-31 23:35:34.677

*** SESSION ID:(38.36) 2018-05-31 23:35:34.677

*** CLIENT ID:() 2018-05-31 23:35:34.677

*** SERVICE NAME:(SYS$USERS) 2018-05-31 23:35:34.677

*** MODULE NAME:(sqlplus@oggtest1 (TNS V1-V3)) 2018-05-31 23:35:34.677

*** ACTION NAME:() 2018-05-31 23:35:34.677

Log read is SYNCHRONOUS though disk_asynch_io is enabled!

DUMP OF REDO FROM FILE '/tpdata/oradata/ogg1/redo03.log'

Opcodes *.*

DBAs: (file # 7, block # 1683) thru (file # 7, block # 1683)

data块的起点和终点（thru），这里我只dump了1683号一个块。

RBAs: 0x000000.00000000.0000 thru 0xffffffff.ffffffff.ffff

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

Times: creation thru eternity

FILE HEADER:

Compatibility Vsn = 186646528=0xb200000

Db ID=4132820558=0xf655d64e, Db Name='OGG1'

Activation ID=4132850254=0xf6564a4e

Control Seq=3130=0xc3a, File size=102400=0x19000

File Number=3, Blksiz=512, File Type=2 LOG

descrip:"Thread 0001, Seq# 0000000036, SCN 0x000000158f45-0xffffffffffff"

thread: 1 nab: 0xffffffff seq: 0x00000024 hws: 0x1 eot: 1 dis: 0

resetlogs count: 0x38d85a12 scn: 0x0000.000e6c20 (945184)

prev resetlogs count: 0x296b946b scn: 0x0000.00000001 (1)

Low scn: 0x0000.00158f45 (1412933) 05/31/2018 23:05:04

Next scn: 0xffff.ffffffff 01/01/1988 00:00:00

Enabled scn: 0x0000.000e6c20 (945184) 09/03/2017 05:28:50

Thread closed scn: 0x0000.00158f45 (1412933) 05/31/2018 23:05:04

Disk cksum: 0x471d Calc cksum: 0x471d

Terminal recovery stop scn: 0x0000.00000000

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

Most recent redo scn: 0x0000.00000000

Largest LWN: 0 blocks

End-of-redo stream : No

Unprotected mode

Miscellaneous flags: 0x800000

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

REDO RECORD - Thread:1 RBA: 0x000024.00000ad6.0010 LEN: 0x01f4 VLD: 0x05

SQL> SELECT TO_NUMBER('24','XXXXXXXXXXXXXXXX') FROM DUAL; TO_NUMBER('23','XXXXXXXXXXXXXXXX')---------------------------------- 36 SQL> SELECT TO_NUMBER('00000ad6','XXXXXXXXXXXXXXXX') FROM DUAL; TO_NUMBER('1E3A','XXXXXXXXXXXXXXXX')------------------------------------ 277436号日志，redo块number是2774，就是我们dump的redo log

SCN: 0x0000.0015939d SUBSCN: 1 05/31/2018 23:33:53

CHANGE #1 TYP:0 CLS:17 AFN:3 DBA:0x00c00080 OBJ:4294967295 SCN:0x0000.0015932b
SEQ:1 OP:5.2 ENC:0 RBL:0

ktudh redo: slt: 0x000e sqn: 0x00000355 flg: 0x0012 siz: 160 fbi: 0

uba: 0x00c00211.010e.03 pxid: 0x0000.000.00000000

CHANGE #2 TYP:0 CLS:18 AFN:3 DBA:0x00c00211 OBJ:4294967295 SCN:0x0000.0015932a
SEQ:1 OP:5.1 ENC:0 RBL:0

ktudb redo: siz: 160 spc: 7794 flg: 0x0012 seq: 0x010e rec: 0x03

xid: 0x0001.00e.00000355

ktubl redo: slt: 14 rci: 0 opc: 11.1 [objn: 75382 objd: 75382 tsn: 8]

Undo type: Regular undo Begin trans Last buffer split: No

Temp Object: No

Tablespace Undo: No

0x00000000 prev ctl uba: 0x00c00211.010e.02

prev ctl max cmt scn: 0x0000.00158bd7 prev tx cmt scn: 0x0000.00158be6

txn start scn: 0xffff.ffffffff logon user: 95 prev brb: 12583426 prev bcl: 0 BuExt idx: 0
flg2: 0

KDO undo record:

KTB Redo

op: 0x03 ver: 0x01

compat bit: 4 (post-11) padding: 1

op: Z

KDO Op code: URP row dependencies Disabled

##下面这部分是修改前的数据,上面和下面这一部分其实是undo的信息

xtype: XA flags: 0x00000000 bdba: 0x01c00693 hdba: 0x01c00692

itli: 2 ispac: 0 maxfr: 4858

tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 0

ncol: 2 nnew: 1 size: -12

col 1: [ 4] 6d 69 6e 67 ##4是长度，6d 69 6e 67是修改前的值

修改前的值:SQL> select utl_raw.cast_to_varchar2(replace('6d,69,6e,67',',')) value from dual; VALUE------------------------------------------------------------------------------------------------------ming

CHANGE #3 TYP:0 CLS:1 AFN:7 DBA:0x01c00693 OBJ:75382 SCN:0x0000.0015673a SEQ:1 OP:11.5 ENC:0 RBL:0

SQL> SELECT TO_NUMBER('01c00693','XXXXXXXXXXXXXXXX') FROM DUAL; TO_NUMBER('01C00693','XXXXXXXXXXXXXXXX')---------------------------------------- 29361811 SQL> select2 dbms_utility.data_block_address_block(29361811) "BLOCK",3 dbms_utility.data_block_address_file(29361811) "FILE"4 from dual; BLOCK FILE---------- ---------- 1683 77号数据文件的1693块就是我dump的块。 75382就是我们操作的test表的object_id OP code是11.5，在DML的操作代码中，11.5代表update row piece

KTB Redo

op: 0x01 ver: 0x01

compat bit: 4 (post-11) padding: 1

op: F xid: 0x0001.00e.00000355 uba: 0x00c00211.010e.03

KDO Op code: URP row dependencies Disabled

xtype: XA flags: 0x00000000 bdba: 0x01c00693 hdba: 0x01c00692

itli: 2 ispac: 0 maxfr: 4858

tabn: 0 slot: 0(0x0) flag: 0x2c lock: 2 ckix: 0

ncol: 2 nnew: 1 size: 12

col 1: [16] 6d 69 6e 67 73 68 75 6f 6d 69 6e 67 73 68 75 6f

Bdba是更新的块的地址，所以跟DBA:0x01c00693一样也就是显而易见的了；Hdba是更新的块所在的段的地址。SQL> SELECT TO_NUMBER('01c00692','XXXXXXXXXXXXXXXX') FROM DUAL; TO_NUMBER('01C00692','XXXXXXXXXXXXXXXX')---------------------------------------- 29361810SQL> select 2 dbms_utility.data_block_address_block(29361810) "BLOCK", 3 dbms_utility.data_block_address_file(29361810) "FILE" 4 from dual; BLOCK FILE---------- ---------- 1682 7TEST表所在的段的信息：SQL> select owner,segment_name,segment_type,header_file,header_block from dba_segments where segment_name='TEST' and tablespace_name='TEST';OWNER SEGMENT_NAME SEGMENT_TYPE HEADER_FILE HEADER_BLOCK------- -------------- ------------ ----------- ------------MING TEST TABLE 7 1682两者是一致的 itli: 2 该事务正在使用第二个事务槽。tabn: 0 该块上第一个表。Flag是0x2c，代表没有出现行迁移，包括first data piece,last data piecehe head piece of row.ncol: 2 该记录有2行nnew：1 修改了1列（b那一列）size: 12 修改列长度增加了12（从4变成16）修改后的值：SQL> select utl_raw.cast_to_varchar2(replace('6d,69,6e,67,73,68,75,6f,6d,69,6e,67,73,68,75,6f',',')) valuefrom dual; VALUE-----------------------------------------------------------------------------------------------------------------------------mingshuomingshuo

CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ:0 OP:5.20 ENC:0

session number = 1

serial number = 15

执行事务的会话信息：SQL> SELECT SID,SERIAL# FROM V$SESSION WHERE SID=( select userenv('SID') FROM DUAL); SID SERIAL#---------- ---------- 1 15

transaction name =

version 186646784

audit sessionid 151083

Client Id =

END OF REDO DUMP

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

Read rate (SYNC): 1419Kb in 0.01s => 138.57 Mb/sec

Total redo bytes: 2047Kb Longest record: 13Kb, moves: 1/2688 moved: 0Mb (0%)

Longest LWN: 504Kb, reads: 240

Last redo scn: 0x0000.001593c8 (1414088)

Change vector header moves = 261/4848 (5%)

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

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

ALTER SYSTEM DUMP LOGFILE 'filename'

RBA MIN seqno . blockno

RBA MAX seqno . blockno;

RBA实际就是块的变化在redo log中的记录位置。所以这里是dump出指定范围的redo块的redo记录。

3. To dump records based on SCN

ALTER SYSTEM DUMP LOGFILE 'filename'

   SCN MIN minscn

   SCN MAX maxscn;

Dump出指定范围SCN的redo记录

4. To dump records based on time

ALTER SYSTEM DUMP LOGFILE 'filename'

   TIME MIN value

   TIME MAX value;

这里的value实际是时间范围,确切说是redo dump time。

下面给出一个时间转变为redo dump time的脚本：

/* Formatted on2011/8/8 23:00:53 (QP5 v5.163.1008.3004) */

SET ECHO OFF

REM NAME: TFSTM2RD.SQL

REMUSAGE:"@path/tfstm2rd"

REM------------------------------------------------------------------------

REM REQUIREMENTS:

REM None.

REM------------------------------------------------------------------------

REM AUTHOR:

REM Anonymous

REM------------------------------------------------------------------------

REM PURPOSE:

REM Converts a standard date into redo dump timeformat.

REM------------------------------------------------------------------------

REM EXAMPLE:

REM Enter day (DD/MM/YYYY) ?08/07/1996

REM Enter time (HH24:MI:SS) ? 12:05:05

REM

REM REDO_YEAR REDO_MONTH REDO_DAY REDO_HOURREDO_MIN REDO_SEC

REM --------- ---------- -------- ----------------- --------

REM 1996 7 8 12 5 5

REM

REM EDO_TIME

REM ----------

REM 273845105

REM

REM------------------------------------------------------------------------

REM DISCLAIMER:

REM This script. is provided for educational purposesonly. It is NOT

REM supported by Oracle World Wide TechnicalSupport.

REM The script. has been tested and appears towork as intended.

REM You should always run new scripts on a testinstance initially.

REM------------------------------------------------------------------------

REM Main text ofscript. follows:

UNDEFINE redo_day

UNDEFINE redo_hhmiss

ACCEPT redo_day PROMPT "Enter day (DD/MM/YYYY) ? "

ACCEPT redo_hhmiss PROMPT "Enter time (HH24:MI:SS) ? "

COLUMN redo_year NEW_VALUE redo_year FORMAT 9999

COLUMN redo_month NEW_VALUE redo_month FORMAT 9999

COLUMN redo_day NEW_VALUE redo_day FORMAT9999

COLUMN redo_hour NEW_VALUE redo_hour FORMAT 9999

COLUMN redo_min NEW_VALUE redo_min FORMAT9999

COLUMN redo_sec NEW_VALUE redo_sec FORMAT9999

COLUMN redo_time NEW_VALUE redo_time

SETVERIFY OFF

SELECT TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'YYYY'))

redo_year,

TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'MM'))

redo_month,

TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'DD'))

redo_day,

TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'HH24'))

redo_hour,

TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'MI'))

redo_min,

TO_NUMBER (

TO_CHAR (

TO_DATE ('&redo_day&redo_hhmiss', 'DD/MM/YYYY HH24:MI:SS'),

'SS'))

redo_sec

FROM DUAL;

SELECT ( ( ( ( ( (&redo_year - 1988)) * 12 + (&redo_month - 1)) * 31

+ (&redo_day - 1))

* 24

+ (&redo_hour))

* 60

+ (&redo_min))

* 60

+ (&redo_sec)

redo_time

FROM DUAL;

5. To dump records based on layer and opcode

ALTER SYSTEM DUMP LOGFILE 'filename'

   LAYER value

   OPCODE value;

Layer和opcode是用来dump出特定类型的redo记录的。

6. Dump the file header information

Dump出所有在线日志的header信息：

   alter session set events 'immediate trace name redohdr level 10';

dump出归档日志的header信息：

   ALTER SYSTEM DUMP LOGFILE 'filename' RBA MIN 1 1 RBA MAX 1 1;

在线日志：

SQL> alter session set events 'immediate trace name redohdr level 10';

Session altered.

[oracle@oggtest1 trace]$ more ogg1_ora_3048.trc

Trace file /tpsys/app/oracle/diag/rdbms/ogg1/ogg1/trace/ogg1_ora_3048.trc

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /tpsys/app/oracle/product/11.2.0/db_1

System name: Linux

Node name: oggtest1

Release: 2.6.32-358.el6.x86_64

Version: #1 SMP Tue Jan 29 11:47:41 EST 2013

Machine: x86_64

Instance name: ogg1

Redo thread mounted by this instance: 1

Oracle process number: 29

Unix process pid: 3048, image: oracle@oggtest1 (TNS V1-V3)

*** 2018-06-01 01:31:40.458

*** SESSION ID:(38.38) 2018-06-01 01:31:40.458

*** CLIENT ID:() 2018-06-01 01:31:40.458

*** SERVICE NAME:(SYS$USERS) 2018-06-01 01:31:40.458

*** MODULE NAME:(sqlplus@oggtest1 (TNS V1-V3)) 2018-06-01 01:31:40.458

*** ACTION NAME:() 2018-06-01 01:31:40.458

DUMP OF LOG FILES: 3 logs in database

LOG FILE #1:

name #3: /tpdata/oradata/ogg1/redo01.log

Thread 1 redo log links: forward: 2 backward: 0

siz: 0x19000 seq: 0x00000022 hws: 0x3 bsz: 512 nab: 0x12c7e flg: 0x1 dup: 1

Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00150d87

Low scn: 0x0000.00151fff 05/30/2018 21:31:05

Next scn: 0x0000.00154ded 05/30/2018 22:54:33

FILE HEADER:

Compatibility Vsn = 186646528=0xb200000

Db ID=4132820558=0xf655d64e, Db Name='OGG1'

Activation ID=4132850254=0xf6564a4e

Control Seq=3105=0xc21, File size=102400=0x19000

File Number=1, Blksiz=512, File Type=2 LOG

redo log key is 35a83c3bcc89f58a38e79d8babc0cd

redo log key flag is 5

descrip:"Thread 0001, Seq# 0000000034, SCN 0x000000151fff-0x000000154ded"

thread: 1 nab: 0x12c7e seq: 0x00000022 hws: 0x3 eot: 0 dis: 0

reset logs count: 0x38d85a12 scn: 0x0000.000e6c20

Low scn: 0x0000.00151fff 05/30/2018 21:31:05

Next scn: 0x0000.00154ded 05/30/2018 22:54:33

Enabled scn: 0x0000.000e6c20 09/03/2017 05:28:50

Thread closed scn: 0x0000.00151fff 05/30/2018 21:31:05

Disk cksum: 0xdeda Calc cksum: 0xdeda

Terminal Recovery Stop scn: 0x0000.00000000

Terminal Recovery Stamp 01/01/1988 00:00:00

Most recent redo scn: 0x0000.00000000

Largest LWN: 2048 blocks

Miscellaneous flags: 0x800000

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

LOG FILE #2:

name #2: /tpdata/oradata/ogg1/redo02.log

Thread 1 redo log links: forward: 3 backward: 1

siz: 0x19000 seq: 0x00000023 hws: 0x5 bsz: 512 nab: 0x13ea0 flg: 0x1 dup: 1

Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00151fff

Low scn: 0x0000.00154ded 05/30/2018 22:54:33

Next scn: 0x0000.00158f45 05/31/2018 23:05:04

FILE HEADER:

Compatibility Vsn = 186646528=0xb200000

Db ID=4132820558=0xf655d64e, Db Name='OGG1'

Activation ID=4132850254=0xf6564a4e

Control Seq=3130=0xc3a, File size=102400=0x19000

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

redo log key is 65a21627df0616da4e0eab04481274

redo log key flag is 5

descrip:"Thread 0001, Seq# 0000000035, SCN 0x000000154ded-0x000000158f45"

thread: 1 nab: 0x13ea0 seq: 0x00000023 hws: 0x5 eot: 0 dis: 0

reset logs count: 0x38d85a12 scn: 0x0000.000e6c20

Low scn: 0x0000.00154ded 05/30/2018 22:54:33

Next scn: 0x0000.00158f45 05/31/2018 23:05:04

Enabled scn: 0x0000.000e6c20 09/03/2017 05:28:50

Thread closed scn: 0x0000.0015680b 05/31/2018 02:12:09

Disk cksum: 0xb8e7 Calc cksum: 0xb8e7

Terminal Recovery Stop scn: 0x0000.00000000

Terminal Recovery Stamp 01/01/1988 00:00:00

Most recent redo scn: 0x0000.00000000

Largest LWN: 2048 blocks

Miscellaneous flags: 0x800000

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

LOG FILE #3:

name #1: /tpdata/oradata/ogg1/redo03.log

Thread 1 redo log links: forward: 0 backward: 2

siz: 0x19000 seq: 0x00000024 hws: 0x1 bsz: 512 nab: 0xffffffff flg: 0x8 dup: 1

Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00154ded

Low scn: 0x0000.00158f45 05/31/2018 23:05:04

Next scn: 0xffff.ffffffff 01/01/1988 00:00:00

FILE HEADER:

Compatibility Vsn = 186646528=0xb200000

Db ID=4132820558=0xf655d64e, Db Name='OGG1'

Activation ID=4132850254=0xf6564a4e

Control Seq=3130=0xc3a, File size=102400=0x19000

File Number=3, Blksiz=512, File Type=2 LOG

redo log key is 822c416515657eb0b48bc9b93c403cc8

redo log key flag is 5

descrip:"Thread 0001, Seq# 0000000036, SCN 0x000000158f45-0xffffffffffff"

thread: 1 nab: 0xffffffff seq: 0x00000024 hws: 0x1 eot: 1 dis: 0

reset logs count: 0x38d85a12 scn: 0x0000.000e6c20

Low scn: 0x0000.00158f45 05/31/2018 23:05:04

Next scn: 0xffff.ffffffff 01/01/1988 00:00:00

Enabled scn: 0x0000.000e6c20 09/03/2017 05:28:50

Thread closed scn: 0x0000.00158f45 05/31/2018 23:05:04

Disk cksum: 0x471d Calc cksum: 0x471d

Terminal Recovery Stop scn: 0x0000.00000000

Terminal Recovery Stamp 01/01/1988 00:00:00

Most recent redo scn: 0x0000.00000000

Largest LWN: 0 blocks

Miscellaneous flags: 0x800000

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

7. Dump an entire log file:

ALTER SYSTEM DUMP LOGFILE 'filename';

Dump出指定日志的所有内容。

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返回关系型数据库教程...

dump的几种方法：

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:

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