-----------
54503100 00000000 00000000 00000000 l TP1.............
00000000
ub2 kcvfhtln @336 0x0005
BBED> d /v offset 336
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 336 to 355 Dba:0x01400001
-------------------------------------------------------
05005450 31000000 00000000 00000000 l ..TP1...........
00000000 l ....
<16 bytes per line>
BBED> m /x 03 offset 336
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 336 to 355 Dba:0x01400001
------------------------------------------------------------------------
03005450 31000000 00000000 00000000 00000000
<32 bytes per line>
(10)检查点
BBED> p kcvfhckp
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x0019b1a1 --->1683873
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x32a59921 -->849713441
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000002
ub4 kcrbabno @504 0x000002e0
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
sys@PROD> select file#,rfile#,CREATION_TIME,checkpoint_change#,unrecoverable_change#,offline_change# from v$datafile;
FILE# RFILE# CREATION_ CHECKPOINT_CHANGE# UNRECOVERABLE_CHANGE# OFFLINE_CHANGE#
---------- ---------- --------- ------------------ --------------------- ---------------
1 1 23-MAR-14 1683873 0 1658859
2 2 23-MAR-14 1683873 0 1658859
3 3 23-MAR-14 1683873 0 1658859
4 4 23-MAR-14 1683873 0 1658859
5 5 29-MAR-14 1684251 0 1658859
sys@PROD> select to_number('19b1a1','xxxxxxxxxxxx') from dual;
TO_NUMBER('19B1A1','XXXXXXXXXXXX')
----------------------------------
1683873
sys@PROD> select to_number('32a59921','xxxxxxxxxxxx') from dual;
TO_NUMBER('32A59921','XXXXXXXXXXXX')
------------------------------------
849713441
sys@PROD> select file#,to_char(CHECKPOINT_TIME,'yyyy-mm-dd hh24:mi:ss') createTime,
2 (to_char(CHECKPOINT_TIME,'yyyy')-1988)*12*31*24*3600+
3 (to_char(CHECKPOINT_TIME,'mm')-1)*31*24*3600+
4 (to_char(CHECKPOINT_TIME,'dd')-1)*24*3600+
5 to_char(CHECKPOINT_TIME,'hh24')*3600+
6 to_char(CHECKPOINT_TIME,'mi')*60+
7 to_char(CHECKPOINT_TIME,'ss') createTimeSCN
8 from v$datafile WHERE file# in(4,5);
FILE# CREATETIME CREATETIMESCN
---------- ------------------- -------------
4 2014-06-08 15:30:41 849713441
5 2014-06-08 15:38:33 849713913
sys@PROD> sys@PROD> select to_char('1684251','xxxxxxxxxxxxxxx') from dual;
TO_CHAR('1684251
----------------
19b31b ====>真正5号文件的检查点SCN
sys@PROD> select to_char('849713913','xxxxxxxxxxxxxxx') from dual;
TO_CHAR('8497139
----------------
32a59af9 ====>真正5号文件的检查点时间
ub4 kscnbas @484 0x0019b1a1 ====>真正5号文件的检查点SCN 19b31b (倒：1bb319)
ub4 kcvcptim @492 0x32a59921 ====>真正5号文件的检查点时间32a59af9（倒：f99aa532）
BBED> d /v offset 484
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 484 to 503 Dba:0x01400001
-------------------------------------------------------
a1b11900 00000000 2199a532 01000000 l ?±......!.￥2....
02000000
BBED> m /x 1bb319 offset 484
File: /u01/app/oracle/oradata/PROD/tp01