网上有朋友发过来了oracle 7.2.3的数据文件说dul新版本无法支持,我进行测试,可以正常使用dul挖oracle 7.2.3版本oracle.再次实测刷新dul对于oracle老版本支持记录(以前实测dul支持oracle 8.0:DUL10直接支持ORACLE 8.0,DUL挖ORACLE 8.0数据库).根据dul官方说法从oracle 6 及其以后版本都支持
最新版dul(10.2.0.6.11)支持oracle 7.2.3

H:\temp\recover\dul10>dul.exe
Data UnLoader: 10.2.0.6.11 - Internal Only - on Sun Nov 08 22:45:26 2015
with 64-bit io functions
Copyright (c) 1994 2015 Bernard van Duijnen All rights reserved.
 Strictly Oracle Internal Use Only
DUL: Warning: Recreating file "dul.log"
Found db_id = 1190425910
Found db_name = ORA7
DUL> show datafiles;
ts# rf# start   blocks offs open  err file name
UNK   1     0   524289    0    0    0 H:\temp\recover\headof\headof\home\systora7.dbf
UNK   2     0   524289    0    1    0 H:\temp\recover\headof\headof\home1\rbsora7.dbf
UNK   3     0   524289    0    0    0 H:\temp\recover\headof\headof\home\tempora7.dbf
UNK   4     0    15361    0    0    0 H:\temp\recover\headof\headof\home\toolora7.dbf
UNK   5     0      513    0    1    0 H:\temp\recover\headof\headof\home\usrora7.dbf
UNK   6     0   524289    0    0    0 H:\temp\recover\headof\headof\home\BSYS_DISK1.dbf
UNK   7     0   524289    0    1    0 H:\temp\recover\headof\headof\home1\BSYS_DISK2.dbf
UNK   8     0   512001    0    1    0 H:\temp\recover\headof\headof\home1\BALANCE_DATA01.dbf
UNK   9     0   262145    0    0    0 H:\temp\recover\headof\headof\home\BALANCE_IDX01.dbf
UNK  10     0   524289    0    0    0 H:\temp\recover\headof\headof\home\CARD.dbf
UNK  11     0   524289    0    0    0 H:\temp\recover\headof\headof\home\LARGE_TRANS.dbf
UNK  12     0   524289    0    0    0 H:\temp\recover\headof\headof\home\tool01.dbf
UNK  13     0   524289    0    0    0 H:\temp\recover\headof\headof\home\system1.dbf
UNK  14     0   524289    0    0    0 H:\temp\recover\headof\headof\home\balance_data02.dbf
UNK  15     0   524289    0    0    0 H:\temp\recover\headof\headof\home\BSYS_DISK3.dbf
UNK  16     0   524289    0    0    0 H:\temp\recover\headof\headof\home\BSYS_DISK4.dbf
UNK  17     0   524289    0    0    0 H:\temp\recover\headof\headof\home\BSYS_DISK5.dbf
UNK  18     0   524289    0    0    0 H:\temp\recover\headof\headof\home\BSYS_DISK6.dbf
UNK  19     0   524289    0    0    0 H:\temp\recover\headof\headof\home\system2.dbf
UNK  20     0   524289    0    0    0 H:\temp\recover\headof\headof\home\card1.dbf
DUL> bootstrap;
Probing file = 1, block = 377
  database version 7 bootstrap$ at file 1, block 302
. unloading table                BOOTSTRAP$
DUL: Warning: block number is non zero but marked deferred trying to process it anyhow
      45 rows unloaded
DUL: Warning: Dictionary cache DC_BOOTSTRAP is empty
Reading BOOTSTRAP.dat 45 entries loaded
Parsing Bootstrap$ contents
DUL: Warning: Recreating file "dict.ddl"
Generating dict.ddl for version 7
 OBJ$: segobjno 17, file 1 block 162
 TAB$: segobjno 1, tabno 1, file 1  block 52
 COL$: segobjno 1, tabno 5, file 1  block 52
 USER$: segobjno 9, tabno 1, file 1  block 142
Running generated file "@dict.ddl" to unload the dictionary tables
. unloading table                      OBJ$    6076 rows unloaded
. unloading table                      TAB$    1067 rows unloaded
. unloading table                      COL$   18105 rows unloaded
. unloading table                     USER$      56 rows unloaded
Reading USER.dat 56 entries loaded
Reading OBJ.dat 6076 entries loaded and sorted 6076 entries
Reading SCANNEDLOBPAGE.dat 0 entries loaded and sorted 0 entries
Reading TAB.dat 1067 entries loaded
Reading COL.dat 18105 entries loaded and sorted 18105 entries
Reading SEG.dat 0 entries loaded
Reading EXT.dat 0 entries loaded and sorted 0 entries
Reading COMPATSEG.dat 0 entries loaded
Reading BOOTSTRAP.dat 45 entries loaded
DUL: Warning: Recreating file "dict.ddl"
Generating dict.ddl for version 7
 OBJ$: segobjno 17, file 1 block 162
 TAB$: segobjno 1, tabno 1, file 1  block 52
 COL$: segobjno 1, tabno 5, file 1  block 52
 USER$: segobjno 9, tabno 1, file 1  block 142
Running generated file "@dict.ddl" to unload the dictionary tables
. unloading table                      OBJ$
DUL: Warning: Recreating file "OBJ.ctl"
    6076 rows unloaded
. unloading table                      TAB$
DUL: Warning: Recreating file "TAB.ctl"
    1067 rows unloaded
. unloading table                      COL$
DUL: Warning: Recreating file "COL.ctl"
   18105 rows unloaded
. unloading table                     USER$
DUL: Warning: Recreating file "USER.ctl"
      56 rows unloaded
Reading USER.dat 56 entries loaded
Reading OBJ.dat 6076 entries loaded and sorted 6076 entries
Reading SCANNEDLOBPAGE.dat 0 entries loaded and sorted 0 entries
Reading TAB.dat 1067 entries loaded
Reading COL.dat 18105 entries loaded and sorted 18105 entries
Reading SEG.dat 0 entries loaded
Reading EXT.dat 0 entries loaded and sorted 0 entries
Reading COMPATSEG.dat 0 entries loaded
Reading BOOTSTRAP.dat 45 entries loaded
DUL> unload table user$;
. unloading table                     USER$
DUL: Warning: Recreating file "USER.ctl"
      56 rows unloaded
DUL>

数据库版本截图

dul执行结果截图

通过内部命令直接读取数据文件版本信息