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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.

Backup and Recovery Features

Oracle8i offers new backup and recovery features. You can now archive to multiple archivelog destinations. New features in Oracle standby databases make it much easier to administer. Oracle8i introduced log miner, a tool that allows you to mine the database redo logs for all sorts of information.


RMAN is just better in 8i. Most recovery catalog requirements are gone. The duplicate command is new in 8i. Tablespace point in time recovery is now supported and new views help you monitor performance of RMAN (v$backup_sync_io and v$backup_async_io).

Multiplexed Archived Redo Logs

Oracle8i now allows you to multiplex archived redo log locations to up to 5 different locations. This is done with the new log_archive_dest_n parameter. You can also define the state of those locations with the log_archive_dest_state_n parameter to enable or defer archiving to a defined location.

Standby Database

Standby database in Oracle8i now allows for managed recovery mode. When the standby database is put in this mode, it will apply redo from the primary database automatically with no administrator interaction (or scripts) required. Note that this mode is mutually exclusive with the standby database when it’s open in read-only mode (another new feature!). To put the database in managed recovery mode issue the following command:


recover managed standby database;


If you want to open your standby database in read-only mode, issue the following command:


Alter database open read only;


When you are done, you can simply shutdown the instance and then re-mount it to start managed recovery again.


Perhaps one of the most underutilized Oracle utilities, logMiner was released in Oracle version 8i. This utility reads the online and archived redo log file and populates views that the Remote DBA can query to analyze the redo stream. With this utility you can see most database changes, who made them and when. The dbms_logmnr and dbms_logmnr_d packages are available in 8i to manage log miner operations and create the log miner dictionary file. A new view, V$LOGMNR_CONTENTS is available to query the results of your log mining session.

RMAN improvements

Oracl10g comes with a just a ton of improvements (I like that word, plethora!) for RMAN. These include the following:

·         The Flash Recovery Area

·         Fast Recovery

·         Using the catalog and uncatalog commands

·         Dropping a database in RMAN

·         Unregistering a database in RMAN

·         Making and Using RMAN backup copies

·         Configuring default disk backup types.

·         Changes to incremental backups.

·         Recovering datafiles not backed up.

·         Changes in error reporting.

·         Compressing RMAN Backups

·         RMAN Related TSPITR changes.

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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