The database administrator identifies transaction030002002B210000as the erroneous transaction and uses Oracle Flashback Transaction Query to audit all changes made by this transaction: SELECT xid, start_scn, commit_scn, operation, logon_user, undo_sql FROM flashback_transaction_query WHERE xid = HEXT...
Oracle 闪回(flashback)数据库到指定时间点 如果是update,delete类误操作且已经commit,优先考虑使用flashback query进行恢复。 select * from test1 as of timestamp to_timestamp('2018-01-13 16:59:29','YYYY-MM-DD hh24:mi:ss'); 1. 如果是drop或truncate table,则不能使用闪回查询,需要使用备库进行整...
What If the Flashback Query Fails? If there is not enough space in the undo tablespace to maintain all the data needed for the flashback query, the query will fail. Even if the DBA created a large undo tablespace, it is possible for a series of large transactions to use all the space...
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在Oracle 10g中, Flash back家族分为以下成员: Flashback Database, Flashback Drop,Flashback Query(分Flashback Query,Flashback Version Query, Flashback Transaction Query 三种) 和Flashback Table。 2.4.1 闪回恢复区(Flashback Recovery Area) 在oracle 9i中引入flashback查询,以便能在需要的时候查到过去某...
Hello everyone, we are using Flashback Version Querys to detect changes in a table between two given SCNs. In 12.2 this works just fine. In 19.6 it is broken. For example: Consider the folowing transaction: insert into emp3(empno) values (1); ...
在Oracle 10g中,Flash back家族分为以下成员:Flashback Database,Flashback Drop,Flashback Query(分Flashback Query,Flashback Version Query,Flashback Transaction Query三种)和Flashback Table。 2.4.1闪回恢复区(Flashback Recovery Area) 在oracle 9i中引入flashback查询,以便能在需要的时候查到过去某个时刻的一致...
1.1.2 Oracle FlashbackVersion Query Use this featureto retrieve metadata and historical data for a specific time interval (forexample, to view all the rows of a table that ever existed during a given timeinterval). Metadata for each row version includes start and end time, type ofchange oper...
if you deleted/updated data by mistake in oracle. and try to recover data from flashback query. Your query may fail with ora-01555 error: SQL> l1 declare2 cursor c is select * from testt2 as of scn 5385449;3 begin4 for i in c loop5 null;6 end loop;7* end;SQL> /declare*ERROR...
The snapshot time is set to the SCN that most closely matches the time specified in query_time. "ENABLE_AT_SYSTEM_CHANGE_NUMBER Procedure" This procedure takes an SCN as an Oracle number and sets the session snapshot to the specified number. Inside the Flashback mode, all queries will...