|Oracle® Database Backup and Recovery Reference
10g Release 2 (10.2)
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To reset the incarnation of the target database in the RMAN repository, which means to do either of the following actions:
Inform RMAN that the SQL statement
RESETLOGS has been executed and that a new incarnation of the target database has been created. Note that if you run the RMAN command ALTER DATABASE
RESETLOGS (not the SQL statement with the same keywords), then RMAN resets the target database automatically so that you do not have to run
DATABASE. By resetting the database, RMAN considers the new incarnation as the current incarnation of the database.
To reset the database to a previous incarnation. Typically, you would reset the incarnation when performing incomplete recovery to a point before a
RESETLOGS operation, or when attempting to undo the affects of a
RESETLOGS by restoring backups taken before a
DATABASE only at the RMAN prompt.
You must be connected to the target database.
A recovery catalog connection is optional. Unlike in catalog mode,
DATABASE in nocatalog mode changes the incarnation only for the current RMAN session.
You must issue a
DATABASE command before you can use RMAN with a target database that has been opened with the SQL statement
RESETLOGS option. If you do not, then RMAN refuses to access the recovery catalog because it cannot distinguish between a
RESETLOGS operation and an accidental restore of an old control file. The
DATABASE command informs RMAN that you issued a
If RMAN is connected
NOCATALOG, then you can only specify
INCARNATION if the database is mounted and the control file contains a record of the prior incarnation. If you do not run
DATABASE, RMAN recovers to the last incarnation recorded in the control file.
If RMAN is connected in
CATALOG mode, then you can specify
INCARNATION when the database is mounted. If database is mounted, however, then the control file must have a record of the prior incarnation.
||Changes the current incarnation to an older incarnation. Specify the primary key of the
Resetting RMAN to a Previous Incarnation in NOCATALOG Mode: Example In
NOCATALOG mode, you must mount a control file that knows about the incarnation that you want to recover. The following scenario makes an old incarnation of database
trgt current again:
CONNECT TARGET / NOCATALOG # step 1: start and mount a control file that knows about the incarnation to which # you want to return. if the current control file does not know about it, then # you must restore an older control file STARTUP NOMOUNT; RESTORE CONTROLFILE UNTIL TIME 'SYSDATE-250'; ALTER DATABASE MOUNT; # step 2: obtain the primary key of old incarnation LIST INCARNATION OF DATABASE trgt; List of Database Incarnations DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time ------- ------- -------- ------------- ------- ---------- ---------- 1 2 TRGT 1334358386 PARENT 154381 OCT 30 2001 16:02:12 1 116 TRGT 1334358386 CURRENT 154877 OCT 30 2001 16:37:39 # step 3: in this example, reset database to incarnation key 2 RESET DATABASE TO INCARNATION 2; # step 4: restore and recover the database to a point before the RESETLOGS RESTORE DATABASE UNTIL SCN 154876; RECOVER DATABASE UNTIL SCN 154876; # step 5: make this incarnation the current incarnation and then list incarnations: ALTER DATABASE OPEN RESETLOGS; LIST INCARNATION OF DATABASE trgt; List of Database Incarnations DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time ------- ------- -------- ---------------- ------- ---------- ---------- 1 2 TRGT 1334358386 PARENT 154381 OCT 30 2001 16:02:12 1 116 TRGT 1334358386 PARENT 154877 OCT 30 2001 16:37:39 1 311 TRGT 1334358386 CURRENT 154877 AUG 13 2002 17:17:03
This example assumes that an incomplete recovery or recovery with a backup control file was performed in
NOCATALOG mode. Later, RMAN is started in
CATALOG mode, but the
RESYNC command fails because the incarnation has not been reset in the catalog.
% rman target / catalog rman/rman@catdb Recovery Manager: Release 10.1.0.2.0 - Production Copyright (c) 1995, 2003, Oracle. All rights reserved. connected to target database: TRGT (DBID=1334531173) connected to recovery catalog database RMAN> RESYNC CATALOG; RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03009: failure of resync command on default channel at 11/01/2001 12:00:43 RMAN-20003: target database incarnation not found in recovery catalog RMAN> RESET DATABASE; new incarnation of database registered in recovery catalog starting full resync of recovery catalog full resync complete