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on the information about backups stored in its recovery catalog. RMAN applies the archived redo logs and finishes the recovery process. You can then open the database with the ALTER DATABASE OPEN RESETLOGS command. This is a point-in-time recovery (PITR), and you need to make sure that the database doesn t apply the old redo logs by mistake. You ensure this by resetting or reinitializing the redo log files. Here s the entire script for performing a tablespace PITR using RMAN: RMAN> RUN { Allocate channel s1 type 'sbt_tape'; Allocate channel s2 type 'sbt_tape'; Set until time '28-JUL-05 06:00:00'; Restore database; Recover database; Sql "alter database open reset logs"; Release channel s1; Release channel s2; } Once you query the database and verify that you have recovered it to the current point in time, you can open the database using the following command, which will undo all changes after the point in time you ve recovered to: RMAN> ALTER DATABASE OPEN USING RESETLOGS; The previous command will archive all online redo logs, reset the log sequence numbers, and give the online redo logs a new time stamp and SCN. You thus eliminate the possibility of corrupting your data files by mistakenly applying older redo logs. If you want to use a specific log sequence number instead of a point in time, you modify the script by replacing the SET UNTIL TIME line with the following: RMAN> SET UNTIL SEQUENCE 1234;

You can log into the RMAN utility using your database credentials. You issue backup/recovery commands after connecting to the target database. To finish your RMAN session, use the exit command. Here is an example of connecting to the database named orcl, which is the target database: $ rman Recovery Manager: Release 11.1.0.6.0 - Production on Thu Mar 27 11:09:16 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. RMAN> CONNECT TARGET / connected to target database: ORCL (DBID=1080111806) RMAN> exit Recovery Manager complete. $

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Security is also a key consideration for the multicast mode deployments. Since all of the SNTP or NTP servers that operate in the multicast mode use the same multicast group address (224.0.1.1), there is always the potential for a rogue or misconfigured multicast server to disrupt the synchronization of the clients. Network administrators ought to consider taking all of the necessary and available security precautions to minimize the potential of NTP synchronization disruption. Implementing access control that is based on the trusted server s IP address is one option. Additionally, where the vendor implementation supports it, consider the configuration cryptographic NTP authentication. See the NTP Security Considerations section later in this chapter.

Note that after you perform any kind of incomplete recovery, the logs are always reset. Essentially, the RESETLOGS option reinitializes the redo log files, erasing all the redo information they currently have, and resets the log sequence number to 1. To apply any archived redo logs to a data file, the SCNs and timestamps in the database files have to match the SCNs and timestamps in the headers of the archived redo log files, and when you perform a RESETLOGS operation, the data files are stamped with new SCN and timestamp information, making it impossible for the older archived redo logs to be applied to them by mistake. The RESETLOGS option is used under these circumstances: When you use a backup control file to recover When you perform an incomplete recovery, rather than a complete recovery When you recover using a control file created with the RESETLOGS option If you were to do the incomplete recovery using an SCN number, the SET UNTIL command would be modified as SET UNTIL SCN nnnn. If you were to use an archived log sequence number, the command would be SET UNTIL LOGSEQ=nnnn THREAD=nnnn, where LOGSEQ is the log you want to recover to.

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