閃回版本查詢
SQL> set line 200
SQL> col starttime for a30
SQL> col endtime for a30
SQL> col operation for a30

SQL> select to_char(versions_starttime,'yyyy-mm-dd hh24:mi:ss') starttime,to_char(versions_endtime,'yyyy-mm-dd hh24:mi:ss') endtime,
   versions_xid xid,versions_operation operation from soe.customers versions
   between timestamp to_date('2018-09-22 14:00:00','yyyy-mm-dd hh24:mi:ss') and sysdate where versions_xid is not null;
STARTTIME                      ENDTIME                        XID              OPERATION
------------------------------ ------------------------------ ---------------- ------------------------------
2018-09-22 14:00:36                                           05001100B8030000 U
2018-09-22 13:59:59                                           05000700B8030000 U
2018-09-22 14:00:25                                           08001B00CC030000 U
2018-09-22 14:00:14                                           05001000B8030000 I
2018-09-22 14:00:20                                           09001700C9030000 I
2018-09-22 14:00:05                                           0B00200041000000 I
2018-09-22 14:00:05                                           09000700CA030000 I
2018-09-22 14:00:11                                           03001800B4030000 I
8 rows selected.

閃回事務查詢
SQL> select undo_sql from flashback_transaction_query where xid = hextoraw('03001800B4030000');
UNDO_SQL
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
delete from "SOE"."LOGON" where ROWID = 'AAAVU+AAGAAAavRAB6';
delete from "SOE"."CARD_DETAILS" where ROWID = 'AAAVU4AAHAAAQEoABz';
delete from "SOE"."ADDRESSES" where ROWID = 'AAAVU3AAHAAAbuoAAy';
delete from "SOE"."CUSTOMERS" where ROWID = 'AAAVU2AAGAAAaqxAAO';

SQL> select undo_sql from flashback_transaction_query where xid = hextoraw('08001B00CC030000');
UNDO_SQL
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
update "SOE"."CUSTOMERS" set "PREFERRED_ADDRESS" = '1162533' where ROWID = 'AAAVU2AAGAAACC9AAS';
delete from "SOE"."ADDRESSES" where ROWID = 'AAAVU3AAHAAAbumAA5';

閃回表
SQL> alter table soe.customers enable row movement;

SQL> select count(*) from soe.customers;

  COUNT(*)
----------
   1000000

SQL> select dbms_flashback.get_system_change_number from dual; 

GET_SYSTEM_CHANGE_NUMBER
------------------------
                 1439085

SQL> select scn_to_timestamp(1439085) scn from dual;

SCN
---------------------------------------------------------------------------
25-MAY-20 05.31.02.000000000 PM

SQL> delete from soe.customers where nls_territory = 'Korea';

12920 rows deleted.

SQL> commit;

Commit complete.

SQL> select count(*) from soe.customers;

  COUNT(*)
----------
    987080

SQL> select count(*) from soe.customers as of timestamp to_timestamp('2020-05-25 17:30:00','yyyy-mm-dd hh24:mi:ss');

  COUNT(*)
----------
   1000000


SQL> flashback table soe.customers to timestamp to_timestamp('2020-05-25 17:30:00','yyyy-mm-dd hh24:mi:ss');

Flashback complete.


SQL> select count(*) from soe.customers;

  COUNT(*)
----------
   1000000

閃回刪除
SQL> show parameter recyclebin;
NAME                                 TYPE                              VALUE
------------------------------------ --------------------------------- ------------------------------
recyclebin                           string                            ON

SQL> drop table warehouses;
Table dropped.

SQL> show recyclebin;
ORIGINAL NAME    RECYCLEBIN NAME                OBJECT TYPE  DROP TIME
---------------- ------------------------------ ------------ -------------------
WAREHOUSES       BIN$doc0/FwhEVPgU8kBqMBrow==$0 TABLE        2018-09-23:17:07:50

SQL> flashback table warehouses to before drop;
Flashback complete.

SQL> select count(*) from warehouses;
  COUNT(*)
----------
      1000
      
SQL> alter index "BIN$doc0/FwgEVPgU8kBqMBrow==$0" rename to warehouses_pk;
Index altered.

SQL> alter table warehouses rename constraint "BIN$doc0/FwfEVPgU8kBqMBrow==$0" to warehouses_pk;
Table altered.

總結：閃回版本查詢，閃回事務查詢，閃回表與UNDO有關，與閃回日誌沒有任何關係
      閃回刪除與recyclebin有關，與閃回日誌沒有任何關係
      閃回資料庫與閃回日誌有關