-none- 2004-08-04 - By -not available-
43,651713,1
2. Dump the block:
Using the file and block dump the block..
Alter system dump datafile <fileid > block min <blockid > block max
<blockid >
Alter system dump datafile 43 block min 651713 block max 651713
3. Look at the trace file and look for the row number from the query 1,
in the dump..
tab 0, row 1, @(protected)
tl: 46 fb: --H-FL-- lb: 0x1 cc: 2
4. For the lob columns stored out of line: dba is in the last four
bytes.. Here is an example..Second columns I blob for me. Count starts
from 0.
col 1: [40]
00 54 00 01 02 0c 00 00 00 01 00 00 00 01 00 00 04 0e f8 c3 00 14 05 00
00
00 00 00 0f a0 00 00 00 00 00 02 0a c9 f2 5e
Here 0ac9f25e is the dba of the out of line lob.
5. Convert this to decimal 181006942.
6. Find the file and block using the above dba..
undef dba
select
dbms_utility.DATA_BLOCK_ADDRESS_FILE(&&dba)|| ', '||
dbms_utility.DATA_BLOCK_ADDRESS_BLOCK(&&dba)
from dual
/
7. You can also dump this lob block to confirm that this analysis is
correct..
buffer tsn: 21 rdba: 0x0ac9f25e (43/651870)
scn: 0x0518.8462f4a6 seq: 0x02 flg: 0x00 tail: 0xf4a61b02
frmt: 0x02 chkval: 0x0000 type: 0x1b=LOB BLOCK
Long field block dump:
Object Id 297174
LobId: 0001004EF8C3 PageNo 0
Version: 0x0000.00000001
PS: This is 8i, 64 bit on Solaris..
HTH
Thanks
Riyaj "Re-yas " Shamsudeen
Certified Oracle DBA
-- --Original Message-- --
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)] On Behalf Of DENNIS WILLIAMS
Sent: Wednesday, August 04, 2004 4:01 PM
To: 'oracle-l@(protected) '
Subject: From row to datafile
List - Does anyone know how to relate a database row to the datafile
where it is stored? Here is the situation: we are going to test the
recovery of a database, removing a few data files and then recovering
them from RMAN backup. These data files store image blobs out-of-line. I
would like to be able to list a few images from a particular data file
so after recovery we could retrieve those images. There are some queries
for dealing with database corruption where you can take a given file and
block and relate it back using dba_segments and sys.uet$. I 'm not sure
how to work for a specific row or with out-of-line blobs. Any ideas
appreciated.
Dennis Williams
DBA
Lifetouch, Inc.
"We all want progress, but if you 're on the wrong road, progress means
doing an about-turn and walking back to the right road; in that case,
the man who turns back soonest is the most progressive. "
-- C.S. Lewis
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