oracle ora_rowscn

Today, the customer said there are several data tables misuse import a new batch of data, these data now need to find out.

If there is no obvious fields can be identified, then ora_rowscn can be used as a reference, the following query can identify data by SCN and will later increase the record to find out:

SQL> select gro_id,ora_rowscn from bms_group;

    GRO_ID ORA_ROWSCN
---------- ----------
       284  584845289
       322  584845289
       302  584845289
         1  584845289
         3  584845289
         8  584845289
         5  584845289
         6  584845289
         7  584845289
       282  584845289
       362  584845289

    GRO_ID ORA_ROWSCN
---------- ----------
       262  584845289
       342  584845289
       284  612073346
       322  612073346
       302  612073346
         1  612073346
         3  612073346
         8  612073346
         5  612073346
         6  612073346
         7  612073346

    GRO_ID ORA_ROWSCN
---------- ----------
       282  612073346
       362  612073346
       262  612073346
       342  612073346

The latter SCN clock, and happens to be misuse of time:

SQL> select scn_to_timestamp(612073346) from dual;

SCN_TO_TIMESTAMP(612073346)
---------------------------------------------------------------------------
07-SEP-09 05.11.11.000000000 PM       

The former comes from SCN historical time, you can rely on:

SQL> select scn_to_timestamp(584845289) from dual;

SCN_TO_TIMESTAMP(584845289)
---------------------------------------------------------------------------
03-SEP-09 04.45.13.000000000 PM

-The End-

转自：http://www.eygle.com/archives/2009/09/ora_rowscn.html