完美解决dul处理clob字段乱码问题

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标题:完美解决dul处理clob字段乱码问题

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

使用过dul的人都知道,dul在处理clob字段的时候,经常性出现乱码,而且官方没有提供好的处理方法,通过不断的测试折腾终于在2013年春节解决了2012年困惑在我心中的疑惑,不再因为dul不可以处理clob而觉得odu/aul更加高级。这个算是2013年给自己的第一份ORACLE数据库恢复方面大礼包.
在dul中,虽然提供了LDR_OUTPUT_IN_UTF8选项,让所有的clob变为UTF8,但是在实际测试中,没有成功.这里对于clob字段处理结果对比:
配置init.dul参数

osd_big_endian_flag=false
osd_dba_file_bits=10
osd_c_struct_alignment=32
osd_file_leader_size=1
osd_word_size = 32
feedback = 1000
dc_columns=2000000
dc_tables=10000
dc_objects=1000000
dc_users=400
dc_segments=100000
USE_LOB_FILES =TRUE
control_file = control.dul
LDR_ENCLOSE_CHAR=|
db_block_size=8192
export_mode=FALSE
compatible=11

正常情况下测试clob字段

[oracle@xifenfei dul]$ ./dul

Data UnLoader: 10.2.0.5.20 - Internal Only - on Sat Jan 19 00:19:05 2013
with 64-bit io functions

Copyright (c) 1994 2013 Bernard van Duijnen All rights reserved.

 Strictly Oracle Internal Use Only


DUL> unload table chf.EVT_T_COMMON_LOG;
. unloading (index organized) table     LOB024001aa
DUL: Warning: Recreating file "LOB024001aa.ctl"
       0 rows unloaded
. unloading (index organized) table     LOB024001da
DUL: Warning: Recreating file "LOB024001da.ctl"
       0 rows unloaded
. unloading (index organized) table     LOB0240020a
DUL: Warning: Recreating file "LOB0240020a.ctl"
       0 rows unloaded
. unloading (index organized) table     LOB0240023a
DUL: Warning: Recreating file "LOB0240023a.ctl"
       0 rows unloaded
. unloading (index organized) table     LOB0240026a
DUL: Warning: Recreating file "LOB0240026a.ctl"
       0 rows unloaded
Preparing lob metadata from lob index
Reading LOB024001aa.dat 0 entries loaded and sorted 0 entries
Preparing lob metadata from lob index
Reading LOB024001da.dat 0 entries loaded and sorted 0 entries
Preparing lob metadata from lob index
Reading LOB0240020a.dat 0 entries loaded and sorted 0 entries
Preparing lob metadata from lob index
Reading LOB0240023a.dat 0 entries loaded and sorted 0 entries
Preparing lob metadata from lob index
Reading LOB0240026a.dat 0 entries loaded and sorted 0 entries
. unloading table          EVT_T_COMMON_LOG
DUL: Warning: Recreating file "CHF_EVT_T_COMMON_LOG.ctl"
    1863 rows unloaded

--修改CHF_EVT_T_COMMON_LOG.ctl中的导入表名为TEST.T_TEST

--创建测试表
SQL> create table t_test as
  2   select * from chf.EVT_T_COMMON_LOG where 1=0;

Table created.

--导入数据
[oracle@xifenfei dul]$ sqlldr test/test control=CHF_EVT_T_COMMON_LOG.ctl 

SQL*Loader: Release 11.2.0.3.0 - Production on Fri Jan 18 23:50:32 2013

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Commit point reached - logical record count 64
Commit point reached - logical record count 128
…………
Commit point reached - logical record count 1856
Commit point reached - logical record count 1863

--测试数据是否乱码
SQL> desc chf.EVT_T_COMMON_LOG
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 ID                                        NOT NULL VARCHAR2(64)
 CASES_OF_STATISTICAL_SITATION                      CLOB
…………
 DEPARTMENT_ID                                      VARCHAR2(40)
 MOTIFY_MAN_ID                                      VARCHAR2(40)

SQL>  select CASES_OF_STATISTICAL_SITATION from t_test where rownum<3;

CASES_OF_STATISTICAL_SITATION
--------------------------------------------------------------------------------
b*kb

     _SfZz

通过试验证明,在dul处理clob字段的时候,很容易出现乱码,因为这里涉及到很多中情况(NLS_LANG,LANG,LDR_OUTPUT_IN_UTF8参数等),经过了多次试验,均不能成功,这里就是为了给出来一个大概的结论:dul在正常情况下不能完美的处理非英文的clob

修改后lob字段文件属性后测试clob字段

--修改CHF_EVT_T_COMMON_LOG.ctl中的导入表名为TEST.EVT_T_COMMON_LOG
--导入数据
[oracle@xifenfei dul]$ sqlldr test/test control=CHF_EVT_T_COMMON_LOG.ctl 

SQL*Loader: Release 11.2.0.3.0 - Production on Fri Jan 18 23:50:32 2013

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Commit point reached - logical record count 64
Commit point reached - logical record count 128
…………
Commit point reached - logical record count 1856
Commit point reached - logical record count 1863

--测试数据是否乱码
SQL> select CASES_OF_STATISTICAL_SITATION from EVT_T_COMMON_LOG where rownum<3;

CASES_OF_STATISTICAL_SITATION
--------------------------------------------------------------------------------
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测试证明:修改了clob文件的相关属性后,完美实现dul处理clob乱码问题

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