oracle 时间和SCN相互转化

主要使用的是函数 timestamp_to_scn() 和 scn_to_timestamp();

1. 时间转化为SCN

SQL> select timestamp_to_scn(sysdate) from dual;

SQL> select sysdate from dual;

SYSDATE
---------
11-MAR-15

SQL> select timestamp_to_scn(sysdate) from dual;

TIMESTAMP_TO_SCN(SYSDATE)
-------------------------
1041879



2. SCN转换为时间

SQL> select current_scn from v$database;

CURRENT_SCN
-----------
1041902

SQL> select scn_to_timestamp(current_scn) from v$database;

SCN_TO_TIMESTAMP(CURRENT_SCN)
---------------------------------------------------------------------------
11-MAR-15 02.14.34.000000000 AM