oracle中truncatetable后的数据如何恢复
来源:才华咖 本文已影响6.59K人
来源:才华咖 本文已影响6.59K人
Oracle认证是由Oracle公司,为能够满足对Oracle核心人士需求,Oracle公司颁布并实施的一项权威品的服务与支持。下面小编为大家整理了关于oracle中truncatetable后的数据如何恢复的文章,一起来看看吧:
1、首先下载odu数据恢复工具,然后解压。(odu工具见附件)
2、查询数据文件路径相关信息:select ts#,file#,rfile#,name,BLOCK_SIZE from v$datafile;
将其结构填入odu目录下的文件中
格式如下:
#ts #fno #rfno filename block_size
0 1 1 /bbdata/hzdb/ 8192
1 2 2 /bbidx/hzdb/ 8192
3 3 3 /bbidx/hzdb/ 8192
4 4 4 /bbdata/hzdb/ 8192
5 5 5 /bbdata/hzdb/ 8192
6 6 6 /bbdata/hzdb/ 8192
7 7 7 /bbdata/hzdb/ 8192
8 8 8 /bbdata/hzdb/ 8192
9 9 9 /bbdata/hzdb/ 8192
3、打开oud
4、执行命令:unload dict
5、执行命令:scan extent (需等一会儿时间)
6、执行命令:desc [用户名].[被删除数据的表名]
Object ID:33547
Storage(Obj#=33547 DataObj#=33549 TS#=11 File#=10 Block#=1400 Cluster=0)
NO. SEG INT Column Name Null? Type
--- --- --- ------------------------------ --------- ------------------------------
1 1 1 OWNER VARCHAR2(30)
2 2 2 OBJECT_NAME VARCHAR2(128)
3 3 3 SUBOBJECT_NAME VARCHAR2(30)
4 4 4 OBJECT_ID NUMBER
5 5 5 DATA_OBJECT_ID NUMBER
6 6 6 OBJECT_TYPE VARCHAR2(18)
7 7 7 CREATED DATE
8 8 8 LAST_DDL_TIME DATE
9 9 9 TIMESTAMP VARCHAR2(19)
10 10 10 STATUS VARCHAR2(7)
11 11 11 TEMPORARY VARCHAR2(1)
12 12 12 GENERATED VARCHAR2(1)
13 13 13 SECONDARY VARCHAR2(1)
从上面的输出中,我们可以看到,TEST.T1表所在的表空间号为11,数据段头部为10号文件的'1400号块。
我们使用ODU来确定T1表原来的data object id。一般来说,数据段的数据块,一般是在段头后面相邻的块中。但是我们可以从段头来确认:
ODU> dump datafile 10 block 1400
Block Header:
block type=0×23 (ASSM segment header block)
block format=0×02 (oracle 8 or 9)
block rdba=0×02800578 (file#=10, block#=1400)
scn=0×0000.00286f2d, seq=4, tail=0×6f2d2304
block checksum value=0×0=0, flag=0
Data Segment Header:
Extent Control Header
-------------------------------------------------------------
Extent Header:: extents: 1 blocks: 5
last map: 0×00000000 #maps: 0 offset: 668
Highwater:: 0×02800579 (rfile#=10,block#=1401)
ext#: 0 blk#: 3 ext size:5
#blocks in seg. hdr’s freelists: 0
#blocks below: 0
mapblk: 0×00000000 offset: 0
--------------------------------------------------------
Low HighWater Mark :
Highwater:: 0×02800579 ext#: 0 blk#: 3 ext size: 5
#blocks in seg. hdr’s freelists: 0
#blocks below: 0
mapblk 0×00000000 offset: 0
Level 1 BMB for High HWM block: 0×02800576
Level 1 BMB for Low HWM block: 0×02800576
--------------------------------------------------------
Segment Type: 1 nl2: 1 blksz: 2048 fbsz: 0
L2 Array start offset: 0×00000434
First Level 3 BMB: 0×00000000
L2 Hint for inserts: 0×02800577
Last Level 1 BMB: 0×02800576
Last Level 1I BMB: 0×02800577
Last Level 1II BMB: 0×00000000
Map Header:: next 0×00000000 #extents: 1 obj#: 33549 flag: 0×220000000
Extent Map
-------------------------------------------------------------
0×02800576 length: 5
Auxillary Map
-------------------------------------------------------------
Extent 0 : L1 dba: 0×02800576 Data dba: 0×02800579
-------------------------------------------------------------
Second Level Bitmap block DBAs
-------------------------------------------------------------
DBA 1: 0×02800577
从上面的输出中的“Extent 0 : L1 dba: 0×02800576 Data dba: 0×02800579”可以看到,段的第1个数据块的RDBA为0×02800579,也就是10号文件的1401块。
我们dump第10号文件的1401块头,来得到表T1原来的data object id:
ODU> dump datafile 10 block 1401 header
Block Header:
block type=0×06 (table/index/cluster segment data block)
block format=0×02 (oracle 8 or 9)
block rdba=0×02800579 (file#=10, block#=1401)
scn=0×0000.00285f2b, seq=2, tail=0×5f2b0602
block checksum value=0×0=0, flag=0
Data Block Header Dump:
Object id on Block? Y
seg/obj: 0×830b=33547 csc: 0×00.285f21 itc: 3 flg: E typ: 1 (data)
brn: 0 bdba: 0×2800576 ver: 0×01
Itl Xid Uba Flag Lck Scn/Fsc
0×01 0xffff.000.00000000 0×00000000.0000.00 C--- 0 scn 0×0000.00285f21
0×02 0×0000.000.00000000 0×00000000.0000.00 ---- 0 fsc 0×0000.00000000
0×03 0×0000.000.00000000 0×00000000.0000.00 ---- 0 fsc 0×0000.00000000
Data Block Dump:
================
flag=0×0 --------
ntab=1
nrow=16
frre=-1
fsbo=0×32
ffeo=0×145
avsp=0×113
tosp=0×113
可以看到,T1表原来的data object id就是33547。
7. 使用ODU来unload数据:
ODU> unload table test.t1 object 33547
8、使用sqlldr导入我们恢复的数据:打开cmd命令,执行E:ODUdata>sqlldr 用户名/密码@数据库id control=TEST_
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