在很多时候,我们需要对数据文件的头部进行分析,但是因为人不在本地,数据文件本身很大,网络又不好.这个时候我们可能要求对方传过来文件文件的头部几M即可.在unix/linux中可以使用dd实现该需求;在win中可以使用ocopy实现该需求.dd实现请参考:dd操作数据文件;这里讲win下面实现方法:
ocopy语法

D:\>ocopy
OCOPY v2.0 - Copyright 1989-1993 Oracle Corp.  All rights reserved.
Usage:
    ocopy from_file [to_file [a | size_1 [size_n]]]
    ocopy -b from_file to_drive
    ocopy -r from_drive to_dir

ocopy拷贝数据文件header

D:\>ocopy  E:\oracle\oradata\xifenfei\SYSAUX01.DBF d:\sysaux.dbf 20480 1
D:\SYSAUX.DBF
OCOPY - Write error.
--忽略(未找到原因)
D:\>dir sysaux*
 驱动器 D 中的卷没有标签。
 卷的序列号是 000B-FBCB
 D:\ 的目录
2012/05/07  22:28             1,024 SYSAUX.DB2
2012/05/07  22:28             1,024 SYSAUX.DB3
2012/05/07  22:28             1,024 SYSAUX.DB4
2012/05/07  22:28             1,024 SYSAUX.DB5
2012/05/07  22:28             1,024 SYSAUX.DB6
2012/05/07  22:28             1,024 SYSAUX.DB7
2012/05/07  22:28             1,024 SYSAUX.DB8
2012/05/07  22:28             1,024 SYSAUX.DB9
2012/05/07  22:28        20,971,520 SYSAUX.DBF
               9 个文件     20,979,712 字节
               0 个目录 28,771,282,944 可用字节
--SYSAUX.DBF是我们需要的文件

上传到linux中bbed验证

[oracle@xifenfei ~]$ bbed
Password:
BBED: Release 2.0.0.0.0 - Limited Production on Fri May 25 08:31:12 2012
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
BBED> set filename '/home/oracle/sysaux.dbf'
        FILENAME        /home/oracle/sysaux.dbf
BBED> set blocksize 8192
        BLOCKSIZE       8192
--从win中拷贝的数据库,第一个block非bbed有效块
BBED> set block 2
        BLOCK#          2
BBED> map
 File: /home/oracle/sysaux.dbf (0)
 Block: 2                                     Dba:0x00000000
------------------------------------------------------------
 Data File Header
 struct kcvfh, 360 bytes                    @0
 ub4 tailchk                                @8188
BBED> map /v
 File: /home/oracle/sysaux.dbf (0)
 Block: 2                                     Dba:0x00000000
------------------------------------------------------------
 Data File Header
 struct kcvfh, 360 bytes                    @0
    struct kcvfhbfh, 20 bytes               @0
    struct kcvfhhdr, 76 bytes               @20
    ub4 kcvfhrdb                            @96
    struct kcvfhcrs, 8 bytes                @100
    ub4 kcvfhcrt                            @108
    ub4 kcvfhrlc                            @112
    struct kcvfhrls, 8 bytes                @116
    ub4 kcvfhbti                            @124
    struct kcvfhbsc, 8 bytes                @128
    ub2 kcvfhbth                            @136
    ub2 kcvfhsta                            @138
    struct kcvfhckp, 36 bytes               @140
    ub4 kcvfhcpc                            @176
    ub4 kcvfhrts                            @180
    ub4 kcvfhccc                            @184
    struct kcvfhbcp, 36 bytes               @188
    ub4 kcvfhbhz                            @224
    struct kcvfhxcd, 16 bytes               @228
    word kcvfhtsn                           @244
    ub2 kcvfhtln                            @248
    text kcvfhtnm[30]                       @250
    ub4 kcvfhrfn                            @280
    struct kcvfhrfs, 8 bytes                @284
    ub4 kcvfhrft                            @292
    struct kcvfhafs, 8 bytes                @296
    ub4 kcvfhbbc                            @304
    ub4 kcvfhncb                            @308
    ub4 kcvfhmcb                            @312
    ub4 kcvfhlcb                            @316
    ub4 kcvfhbcs                            @320
    ub2 kcvfhofb                            @324
    ub2 kcvfhnfb                            @326
    ub4 kcvfhprc                            @328
    struct kcvfhprs, 8 bytes                @332
    struct kcvfhprfs, 8 bytes               @340
    ub4 kcvfhtrt                            @356
 ub4 tailchk                                @8188
--数据块拷贝出来正常