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Don Burleson Blog 







dba_flashback_archive Tips

Oracle Database Tips by Donald BurlesonJune 21, 2015

Question:  What is the dba_flashback_archive view? 

How can dba_flashback_view be used to monitor Oracle flashback?

Answer:  The  dba_flashback_archive view contains the columns flashback_archive_name, flashback_archive#, retention_in_days, create_time, last_purge_time  and status to help the DBA administer the flashback feature of Oracle. 

For more details see my notes on using total recall with flashback data archive.

Here is the query to show the dba_flashback_archive contents:


 The dba_flashback_archive describes all flashback archives in the database and the status column of dba_flashback_archive indicates whether the flashback archive is a default archive for the database.  

All DBA's will enable a flashback_data_archive area that can then be seen by dba_flashback_archive.  

Please note these limitations on using DDL with 11g flashback data archive.  

With a flashback data archive it is possible to view data as any point in time  since the flashback data archive was created. However, attempting to view  data as a timestamp before the data archive is created causes the following  ORA-01466 flashback error:

 ORA-01466: unable to read data - table definition has changed    

If you try to drop a flashback tablespace that is in-use you get the ORA-55641 error:

SQL > alter flashback flashback_archive_area_one archive remove tablespace flashback_tablespace_one;  

ORA-55641: Cannot drop tablespace used by Flashback Data Archive  

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