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Oracle New Flashback Features

Robert Freeman

 

 
Robert Freeman is available for custom consulting and is a recognized expert in all areas of Oracle technology.  Freeman is the author of "Oracle Replication" and "Easy Oracle Jumpstart", a great new book for beginner Remote DBA's.

Oracle Database 10g Flashback Features

Oracle Database 10g offers a new set of “Flashback” features that allow you to review database data, and even reset the database, or database objects, to a point in time in the past without actually having to perform a recovery.

Flashback Database

Flashback query is a very powerful feature in the Oracle database that was introduced in Oracle9i, and enhanced in Oracle9i Release 2. Now, Oracle10g offers even more functionality in the form of Flashback Database. Flashback database allows you to flashback the entire database to a specific point in time.

Flashback drop

Oracle10g offers flashback drop. This feature allows you to undo the effects of a drop table command via the new flashback table SQL command using the to before drop syntax.

Flashback Versions Query

Flashback versions query allows you to define a minimum and maximum time (using the versions between timestamp clause of the select statement) or scn range (using the versions between SCN clause of the select statement), and then query a specific row or set of rows in a table to see a list of all values assigned to those rows.

Flashback Transaction Query

Oracle10g provides the ability to easily reconstruct SQL statements that have been executed by SQL statements. Previously, you would need to use Log Miner to generate SQL redo statements that could be used to replicate SQL statements executed in the database. Now, Flashback Transaction Query can be used to reconstruct the SQL statements used to make changes in the database, and those that can be used to undo the change.

Flashback Table

The flashback table command allows you to flashback an Oracle table based on timestamp or database SCN. All flashback table operations must be at the beginning of any transaction and flashback table operations are not supported for the SYS user.

 

     

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