dul恢复drop表测试-优快云博客

dul对被drop对象进行恢复，需要提供两个信息

1.被删除表所属表空间(非必须)
2.被删除表结构(必须)
模拟删除表

--创建测试表
SQL> create table t_dul_drop tablespace czum
  2  as
  3  select * from dba_tables;

Table created.

--备份被删除表数据，便于比较和提供测试表结构
SQL> create table t_dul_drop_bak tablespace users
  2  as select * from t_dul_drop;

Table created.

SQL> alter system switch logfile;

System altered.

SQL> select count(*) from t_dul_drop;

  COUNT(*)
----------
      1785

SQL> drop table chf.t_dul_drop purge;

Table dropped.

SQL> alter system checkpoint;

System altered.

使用logminer找到data_object_id

delete from "SYS"."OBJ$" where "OBJ#" = '68474' and "DATAOBJ#" ='68474'
and "OWNER#" = '61' and "NAME" = 'T_DUL_DROP' and "NAMESPACE" = '1' and
"SUBNAME" IS NULL and "TYPE#" = '2' and "CTIME" = TO_DATE('04-FEB-13','DD-MON-RR')
and "MTIME" = TO_DATE('04-FEB-13', 'DD-MON-RR') and "STIME" = TO_DATE('04-FEB-13', 'DD-MON-RR')
and "STATUS" ='1' and "REMOTEOWNER" IS NULL and "LINKNAME" IS NULL and "FLAGS" = '0'
and "OID$" IS NULL and "SPARE1" = '6' and "SPARE2" = '1' and "SPARE3" ='61' and
"SPARE4" IS NULL and "SPARE5" IS NULL and "SPARE6" IS NULL and ROWID ='AAAAASAABAAAPzCAAV';

这里可以知道，被删除表的data_object_id为68474

DUL恢复被删除表

--dul版本
E:\dul10>dul.exe

Data UnLoader 10.2.4.37 - Oracle Internal Only - on Mon Feb 04 23:49:50 2013
with 64-bit io functions

Copyright (c) 1994 2010 Bernard van Duijnen All rights reserved.

Strictly Oracle Internal use Only

DUL>  ALTER SESSION SET USE_SCANNED_EXTENT_MAP = TRUE;
Parameter altered

--扫描所属表空间
DUL> scan tablespace 6;
Scanning tablespace 6, data file 6 ...
  13 segment header and 331 data blocks
  tablespace 6, data file 6: 1279 blocks scanned
Reading EXT.dat 13 entries loaded and sorted 13 entries
Reading SEG.dat 13 entries loaded
Reading COMPATSEG.dat 0 entries loaded
Reading SCANNEDLOBPAGE.dat 0 entries loaded and sorted 0 entries

--scan tables得到需求表(可以核对数据样例)
DUL> scan tables;
UNLOAD TABLE OBJNO68474 ( COL001 VARCHAR2(11), COL002 VARCHAR2(30), COL003 VARCHAR2(6)
        , COL004 VARCHAR2(20), COL005 VARCHAR2(30), COL006 VARCHAR2(5), COL007 NUMBER
        , COL008 NUMBER, COL009 NUMBER, COL010 NUMBER, COL011 NUMBER
        , COL012 NUMBER, COL013 NUMBER, COL014 NUMBER, COL015 CHAR
        , COL016 NUMBER, COL017 NUMBER, COL018 VARCHAR2(3), COL019 VARCHAR2(1)
        , COL020 NUMBER, COL021 NUMBER, COL022 NUMBER, COL023 NUMBER
        , COL024 NUMBER, COL025 NUMBER, COL026 NUMBER, COL027 NUMBER
        , COL028 VARCHAR2(10), COL029 VARCHAR2(10), COL030 VARCHAR2(5), COL031 VARCHAR2(7)
        , COL032 NUMBER, COL033 DATE, COL034 VARCHAR2(3), COL035 VARCHAR2(12)
        , COL036 VARCHAR2(1), COL037 VARCHAR2(1), COL038 VARCHAR2(3), COL039 VARCHAR2(7)
        , COL040 VARCHAR2(7), COL041 VARCHAR2(7), COL042 VARCHAR2(8), COL043 VARCHAR2(3)
        , COL044 VARCHAR2(2), COL045 VARCHAR2(15), COL046 VARCHAR2(8), COL047 VARCHAR2(3)
        , COL048 VARCHAR2(3), COL049 VARCHAR2(8), COL050 VARCHAR2(8), COL051 VARCHAR2(5)
        , COL052 VARCHAR2(2), COL053 VARCHAR2(2), COL054 VARCHAR2(3), COL055 VARCHAR2(7) )
    STORAGE( DATAOBJNO 68474 );

--恢复删除表(业务提供表结构)
DUL> unload table t_dul_drop(
  2  OWNER                              VARCHAR2(30),
  3  TABLE_NAME                         VARCHAR2(30),
  4  TABLESPACE_NAME                                    VARCHAR2(30),
  5  CLUSTER_NAME                                       VARCHAR2(30),
  6  IOT_NAME                                           VARCHAR2(30),
  7  STATUS                                             VARCHAR2(8) ,
  8  PCT_FREE                                           NUMBER      ,
  9  PCT_USED                                           NUMBER      ,
10  INI_TRANS                                          NUMBER      ,
11  MAX_TRANS                                          NUMBER      ,
12  INITIAL_EXTENT                                     NUMBER      ,
13  NEXT_EXTENT                                        NUMBER      ,
14  MIN_EXTENTS                                        NUMBER      ,
15  MAX_EXTENTS                                        NUMBER      ,
16  PCT_INCREASE                                       NUMBER      ,
17  FREELISTS                                          NUMBER      ,
18  FREELIST_GROUPS                                    NUMBER      ,
19  LOGGING                                            VARCHAR2(3) ,
20  BACKED_UP                                          VARCHAR2(1) ,
21  NUM_ROWS                                           NUMBER      ,
22  BLOCKS                                             NUMBER      ,
23  EMPTY_BLOCKS                                       NUMBER      ,
24  AVG_SPACE                                          NUMBER      ,
25  CHAIN_CNT                                          NUMBER      ,
26  AVG_ROW_LEN                                        NUMBER      ,
27  AVG_SPACE_FREELIST_BLOCKS                          NUMBER      ,
28  NUM_FREELIST_BLOCKS                                NUMBER      ,
29  DEGREE                                             VARCHAR2(20),
30  INSTANCES                                          VARCHAR2(20),
31  CACHE                                              VARCHAR2(10),
32  TABLE_LOCK                                         VARCHAR2(8) ,
33  SAMPLE_SIZE                                        NUMBER      ,
34  LAST_ANALYZED                                      DATE        ,
35  PARTITIONED                                        VARCHAR2(3) ,
36  IOT_TYPE                                           VARCHAR2(12),
37  TEMPORARY                                          VARCHAR2(1) ,
38  SECONDARY                                          VARCHAR2(1) ,
39  NESTED                                             VARCHAR2(3) ,
40  BUFFER_POOL                                        VARCHAR2(7) ,
41  FLASH_CACHE                                        VARCHAR2(7) ,
42  CELL_FLASH_CACHE                                   VARCHAR2(7) ,
43  ROW_MOVEMENT                                       VARCHAR2(8) ,
44  GLOBAL_STATS                                       VARCHAR2(3) ,
45  USER_STATS                                         VARCHAR2(3) ,
46  DURATION                                           VARCHAR2(15),
47  SKIP_CORRUPT                                       VARCHAR2(8) ,
48  MONITORING                                         VARCHAR2(3) ,
49  CLUSTER_OWNER                                      VARCHAR2(30),
50  DEPENDENCIES                                       VARCHAR2(8) ,
51  COMPRESSION                                        VARCHAR2(8) ,
52  COMPRESS_FOR                                       VARCHAR2(12),
53  DROPPED                                            VARCHAR2(3) ,
54  READ_ONLY                                          VARCHAR2(3) ,
55  SEGMENT_CREATED                                    VARCHAR2(3) ,
56  RESULT_CACHE                                       VARCHAR2(7))
57   STORAGE( DATAOBJNO 68474 );
. unloading table                T_DUL_DROP
DUL: Warning: Recreating file "T_DUL_DROP.ctl"
    1785 rows unloaded

模拟业务规则提供，创建表

SQL> create table t_dul_drop as select * from t_dul_drop_bak where 1=0;

Table created.

导入数据

e:\dul10>sqlldr chf/xifenfei control=T_DUL_DROP.ctl

SQL*Loader: Release 11.2.0.3.0 - Production on Mon Feb 4 23:35:57 2013

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

Commit point reached - logical record count 64
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Commit point reached - logical record count 1785

恢复数据结果

SQL> select count(*) from t_dul_drop;

  COUNT(*)
----------
      1785

SQL> select owner,table_name from t_dul_drop where rownum<10;

OWNER                          TABLE_NAME
------------------------------ ------------------------------
SYS                            IDL_CHAR$
SYS                            IDL_UB2$
SYS                            IDL_SB4$
SYS                            ERROR$
SYS                            SETTINGS$
SYS                            NCOMP_DLL$
SYS                            PROCEDUREJAVA$
SYS                            PROCEDUREC$
SYS                            PROCEDUREPLSQL$

9 rows selected.