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You can use Flashback Database in the following situations: To retrieve a dropped schema When a user error affects the entire database When you truncate a table in error When a batch job performs only partial changes The Flashback Database feature uses flashback database logs, which are stored in the new flash recovery area, to undo changes to a point in time just before a specified target time or SCN. Since the specified target time and the actual recovery time may differ slightly, you then use archived redo logs to recover the database over the short period of time between the target time and the actual recovery time. Once the Flashback Database feature is enabled, you simply use the FLASHBACK DATABASE command to return the database to its state at a previous time, SCN, or log sequence. You can issue the FLASHBACK DATABASE command from either RMAN or SQL*Plus. The only difference is that RMAN will automatically retrieve the necessary archived redo logs, whereas in SQL*Plus you may have to supply the archived redo logs, unless you use the SET AUTORECOVERY ON feature in SQL*Plus. We ll take a look at the whole Flashback Database process in more detail shortly, but first let s look at how to enable (and disable) the Flashback Database feature.

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Keypress=$(head -c1) # Keypress=$(dd bs=1 count=1 2> /dev/null)

Since you need the current data files in order to apply changes to them, you can t use the Flashback Database feature in cases where a data file has been damaged or lost.

It is important to understand that including header files with declarations of managed types in other projects is not an alternative to referencing projects using the #using construct or the /FU compiler switch In C++, types are identified by their (namespace-qualified) type name Managed types are identified in a less ambiguous way Every managed type is identified via its type name and the assembly that has defined it Since System::Uri is defined in Systemdll, its complete type name is as follows: SystemUri, System, Version=2000, Culture=neutral, PublicKeyToken=b77a5c561934e089 This type name is called the assembly-qualified type name It includes the namespacequalified type name SystemUri (with a dot [] as the namespace separator), and the complete name of the assembly in which it is defined As you can see, a complete assembly name has several parts These will be discussed in 4.

In order to configure the Flashback Database feature, you need to step through a series of operations, as follows: 1. Check that your database is in the archivelog mode by either querying the V$DATABASE view, or by simply issuing the following command: SQL> ARCHIVE LOG LIST Database log mode Automatic archival Archive destination Oldest online log sequence Next log sequence to archive Current log sequence SQL> Archive Mode Enabled /u01/app/oracle/admin/finance/arch/finance 42035 42039 42039

The preceding output reveals that the database is indeed running in the archivelog mode. If it isn t, you can turn archive logging on with the ALTER DATABASE statement shown in the following code, after first shutting down the database and starting it up initially in the mount mode: SQL> SQL> SQL> SQL> SHUTDOWN IMMEDIATE; STARTUP MOUNT; ALTER DATABASE ARCHIVELOG; STARTUP OPEN

2. Set up a flash recovery area, as described in 15. 3. Set the DB_FLASHBACK_RETENTION_TARGET initialization parameter to specify how far back you can flashback your database. The following code sets the Flashback target to 1 day (1,440 minutes): SQL> ALTER SYSTEM SET 2 DB_FLASHBACK_RETENTION_TARGET=1440; System altered. SQL> 4. Shut down and restart the database in the mount exclusive mode. If you are using a single instance, a simple MOUNT command can be used: SQL> SHUTDOWN IMMEDIATE; Database closed. Database dismounted. ORACLE instance shut down. SQL> STARTUP MOUNT; 5. Enable the Flashback Database feature: SQL> ALTER DATABASE FLASHBACK ON; Database altered. SQL> 6. Use the ALTER DATABASE OPEN command to open the database and then confirm that the Flashback Database feature is enabled, by querying the V$DATABASE view: SQL> STARTUP OPEN; SQL> SELECT FLASHBACK_ON FROM V$DATABASE; FLA -------YES SQL>

1. Trajectory calculations can be found at http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html. 2. Thanks to Stephane Chazelas, who supplied the keypress-detection code found on http://tldp.org/ LDP/abs/html/system.html.