Flashback Query查询操作的事务

Flashback Query：查询过去某个时间点对象中保存的记录信息，在当前时间与指定过去某个时间点之间。

SQL> conn scott/Oracle
Connected.
SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER
------------------------
1196559

SQL> update flash_tbl set id=id+100 where id>15;

5 rows updated.

SQL> commit;

Commit complete.

SQL> delete flash_tbl where id<5;

4 rows deleted.

SQL> commit;

Commit complete.

SQL> desc flash_tbl
Name Null？ Type
----------------------------------------- -------- ----------------------------
ID NUMBER
VL VARCHAR2（1）

SQL> insert into flash_tbl values（300,"r"）;

1 row created.

SQL> insert into flash_tbl values（500,"t"）;

1 row created.

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER
------------------------
1196625
SQL> select id,vl,versions_startscn,versions_endscn,versions_operation,versions_xid from flash_tbl versions between scn 1196559 and 1196625;

ID V VERSIONS_STARTSCN VERSIONS_ENDSCN V VERSIONS_XID
---------- - ----------------- --------------- - ----------------
120 S 1196576 U 0700290074010000
119 R 1196576 U 0700290074010000
118 Q 1196576 U 0700290074010000
117 P 1196576 U 0700290074010000
116 O 1196576 U 0700290074010000
10 I
11 J
12 K
13 L
14 M
15 N

ID V VERSIONS_STARTSCN VERSIONS_ENDSCN V VERSIONS_XID
---------- - ----------------- --------------- - ----------------
16 O 1196576
17 P 1196576
18 Q 1196576
19 R 1196576
20 S 1196576
4 C 1196588 D 08000B0096010000
3 B 1196588 D 08000B0096010000
2 A 1196588 D 08000B0096010000
1 / 1196588 D 08000B0096010000
1 / 1196588
2 A 1196588

ID V VERSIONS_STARTSCN VERSIONS_ENDSCN V VERSIONS_XID
---------- - ----------------- --------------- - ----------------
3 B 1196588
4 C 1196588
5 D
6 E
7 F
8 G
9 H

29 rows selected.

根据记录，可以看到开始SCN和结束SCN，从操作列有I（插入），U（更新），D（删除），还有事务ID。

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER
------------------------
1200548

SQL> delete flash_tbl where id=116;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER
------------------------
1200555
SQL> conn / as sysdba
Connected.
SQL> grant select any transaction to scott;

Grant succeeded.

SQL> conn scott/oracle
Connected.

SQL> select xid,commit_scn,commit_timestamp,operation,undo_sql from flashback_transaction_query Q where Q.xid in（select versions_xid from flash_tbl versions between

scn 1200548 and 1200555）;

XID COMMIT_SCN COMMIT_TI OPERATION
---------------- ---------- --------- --------------------------------
UNDO_SQL
--------------------------------------------------------------------------------
0A002F0062010000 1200554 31-MAR-14 DELETE
insert into "SCOTT"."FLASH_TBL"（"ID","VL"） values （"116","O"）;

0A002F0062010000 1200554 31-MAR-14 BEGIN

通过上面可以看到，刚才所做的操作及时间，与LogMiner功能挺像。更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx？tid=12Oracle数据库中由于没有做任何约束,如何删掉表中重复的记录Oracle RAC无备份情况恢复ocr和olr相关资讯 Flashback Query 本文评论查看全部评论（0）