November 11, 2009
工作日志：闪回查询及scn_to_timestamp
作者:eygle
出处:http://blog.eygle.com
上周在培训期间，一个客户的数据库出了误UPDATE的问题，修改错了数据，请求我帮忙恢复。闪回查询在这类误操作中非常有用，只要发现的及时，数据可以快速的闪回回来，我想这是开发人员也应该掌握的SQL查询。
记录一下工作日志：
SQL> desc lm_mtrp_syn_channelinfo
Name Null? Type
----------------------------------------- -------- ----------------------------
CHANNELID NUMBER
SGWID VARCHAR2(50)
SERVICETYPE VARCHAR2(50)
SPNUMBER VARCHAR2(50)
CMD VARCHAR2(50)
CREATETIME DATE
MORE VARCHAR2(500)
SQL> select count(*) from lm_mtrp_syn_channelinfo;
COUNT(*)
----------
21
SQL> select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
708677858
SQL> select count(*) from lm_mtrp_syn_channelinfo as of scn 708600000;
COUNT(*)
----------
21
SQL> select count(*) from lm_mtrp_syn_channelinfo as of scn 708000000;
COUNT(*)
----------
21
SQL> select scn_to_timestamp(708000000) from dual;
SCN_TO_TIMESTAMP(708000000)
---------------------------------------------------------------------------
05-NOV-09 01.37.08.000000000 PM
SQL> create table lm_temp as select * from lm_mtrp_syn_channelinfo as of scn 708000000;
Table created.
-The End-
Posted by eygle at 2:28 PM | Comments (3)