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--scn
SQL> alter table soe.customers enable row movement;
Table altered.
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975317
SQL> select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
1217679
SQL> delete from soe.customers where nls_territory = 'Korea';
12470 rows deleted.
SQL> commit;
Commit complete.
SQL> select count(*) from soe.customers;
COUNT(*)
----------
962847
SQL> flashback table soe.customers to scn 1217679;
Flashback complete.
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975317
閃回表--timestamp
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975317
SQL> select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
1221943
SQL> select scn_to_timestamp(1221943) scn from dual;
SCN
---------------------------------------------------------------------------
23-SEP-18 04.17.24.000000000 PM
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975317
SQL> select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
1222481
SQL> select scn_to_timestamp(1222481) scn from dual;
SCN
---------------------------------------------------------------------------
23-SEP-18 04.22.21.000000000 PM
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975340
SQL> flashback table soe.customers to timestamp to_timestamp('2018-09-23 16:17:24','yyyy-mm-dd hh24:mi:ss');
Flashback complete.
SQL> select count(*) from soe.customers;
COUNT(*)
----------
975317
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==$0" to warehouses_pk;
Table altered.
閃回數據庫
SQL> startup mount;
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size 2260088 bytes
Variable Size 322962312 bytes
Database Buffers 687865856 bytes
Redo Buffers 55848960 bytes
Database mounted.
SQL> alter database flashback on;
Database altered.
SQL> alter database open;
Database altered.
SQL> select dbid,name,flashback_on,current_scn from v$database;
DBID NAME FLASHBACK_ CURRENT_SCN
---------- --------------------------- ---------- -----------
1085678857 KING YES 1229459
SQL> show parameter db_flashback
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
db_flashback_retention_target integer 1440
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
Session altered.
SQL> select count(*) from orders;
COUNT(*)
----------
1430069
SQL> select sysdate from dual;
SYSDATE
-------------------
2018-09-24 13:43:57
SQL> truncate table orders;
Table truncated.
SQL> select count(*) from orders;
COUNT(*)
----------
0
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size 2260088 bytes
Variable Size 322962312 bytes
Database Buffers 687865856 bytes
Redo Buffers 55848960 bytes
Database mounted.
SQL> flashback database to timestamp to_timestamp('2018-09-24 13:43:57','yyyy-mm-dd hh24:mi:ss');
Flashback complete.
SQL> alter database open read only;
Database altered.
SQL> conn soe/soe
Connected.
SQL> select count(*) from orders;
COUNT(*)
----------
1430069
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size 2260088 bytes
Variable Size 322962312 bytes
Database Buffers 687865856 bytes
Redo Buffers 55848960 bytes
Database mounted.
SQL> alter database open resetlogs;
Database altered.
SQL> conn soe/soe
Connected.
SQL> select count(*) from orders;
COUNT(*)
----------
1430069
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
閃回數據庫與閃回日誌有關
