Re: Incremental Updated Backup
- From: wissem elkhlifi <wissem@xxxxxxxxxxxxxxxx>
- To: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- Date: Wed, 6 Jul 2011 11:54:57 +0200
> hello Niall,
>
> This ths second output, in the second scenario, I have put the wrong
> output. This is the correct.
> Thanks,
>
>
> [oracle@wissem backupset]$ rlrman target /
>
> Recovery Manager: Release 11.2.0.1.0 - Production on Sun Jul 3 22:13:10 2011
>
> Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
>
> connected to target database: ORAWISS (DBID=3175451436)
>
> RMAN> run{
>
> 2> allocate channel dev1 type disk;
>
> 3> set until time "to_date('2011-01-07:21:35:36', 'yyyy-dd-mm:hh24:mi:ss')";
>
> 4> restore database;
>
> 5> recover database;
>
> 6> }
>
> using target database control file instead of recovery catalog
>
> allocated channel: dev1
>
> channel dev1: SID=19 device type=DISK
>
> executing command: SET until clause
>
> Starting restore at 03-JUL-11
>
> released channel: dev1
>
> RMAN-00571: ===========================================================
>
> RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
>
> RMAN-00571: ===========================================================
>
> RMAN-03002: failure of restore command at 07/03/2011 22:13:32
>
> RMAN-06026: some targets not found - aborting restore
>
> RMAN-06023: no backup or copy of datafile 5 found to restore
>
> RMAN-06023: no backup or copy of datafile 4 found to restore
>
> RMAN-06023: no backup or copy of datafile 2 found to restore
>
> RMAN-06023: no backup or copy of datafile 1 found to restore
>
> RMAN>
>
>
>
>
> On 6 July 2011 10:17, Niall Litchfield <niall.litchfield@xxxxxxxxx> wrote:
>
>> I'm probably missing something, but your second scenario seems to be
>> trying to recover into the future.
>>
>> On 6 Jul 2011 08:44, "wissem elkhlifi" <wissem@xxxxxxxxxxxxxxxx> wrote:
>>
>> Hi,
>>
>> About RMAN incremental updated backup.I am comparing between the use
>> of “until time” clause and not including this clause "until time" in my
>> backups.
>> With our backup strategy, we need to recover the database to any time
>> within the past 31 days and we weekly move the backups to tape.
>> From the output below, I have the coclusion to use UNTIL TIME clause
>> if we want to recover the database to any point in time
>> within the recovery window of 31 days. But, we have backup tapes! What
>> do you think?
>>
>> 1- First Backup Script
>>
>> CONNECT TARGET /
>>
>> CROSSCHECK BACKUP;
>> CROSSCHECK ARCHIVELOG ALL;
>>
>> # Incrementally updated backup.
>> RECOVER COPY OF DATABASE WITH TAG 'LVL0_MERGE_INCR' UNTIL TIME
>> 'SYSDATE-31';
>> BACKUP CHECK LOGICAL INCREMENTAL LEVEL 1 CUMULATIVE COPIES=1 FOR
>> RECOVER OF COPY WITH TAG 'LVL0_MERGE_INCR' DATABASE;
>>
>> # Switch current logfile to archive
>> sql 'ALTER SYSTEM ARCHIVE LOG CURRENT';
>>
>> # Backup archivelogs
>> BACKUP CHECK LOGICAL AS COMPRESSED BACKUPSET FILESPERSET 10 ARCHIVELOG
>> ALL DELETE INPUT;
>>
>> # delete obsolete backups
>> CROSSCHECK BACKUP;
>> DELETE NOPROMPT OBSOLETE;
>> DELETE NOPROMPT EXPIRED BACKUP;
>>
>> exit;
>>
>> 2- Second backup script:
>>
>> CONNECT TARGET /
>>
>> CROSSCHECK BACKUP;
>> CROSSCHECK ARCHIVELOG ALL;
>>
>> # Incrementally updated backup.
>> RECOVER COPY OF DATABASE WITH TAG 'LVL0_MERGE_INCR';
>> BACKUP CHECK LOGICAL INCREMENTAL LEVEL 1 CUMULATIVE COPIES=1 FOR
>> RECOVER OF COPY WITH TAG 'LVL0_MERGE_INCR' DATABASE;
>>
>> # Switch current logfile to archive
>> sql 'ALTER SYSTEM ARCHIVE LOG CURRENT';
>>
>> # Backup archivelogs
>> BACKUP CHECK LOGICAL AS COMPRESSED BACKUPSET FILESPERSET 10 ARCHIVELOG
>> ALL DELETE INPUT;
>>
>> # delete obsolete backups
>> CROSSCHECK BACKUP;
>> DELETE NOPROMPT OBSOLETE;
>> DELETE NOPROMPT EXPIRED BACKUP;
>>
>> exit;
>>
>> My database is 11gR2.
>>
>> RMAN settings are the same for both scenarios and are the following
>> and my db is in archivelog mode:
>>
>> RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
>>
>> RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 31 DAYS;
>>
>>
>> 1- Backup Script number one:
>>
>> WITH UNTIL CLAUSE
>> RECOVER COPY OF DATABASE WITH TAG ‘LVL0_MERGE_INCR’ UNTIL TIME
>> ‘SYSDATE-31′;
>>
>> Now, using RMAN we will try to recover the database to a time in the
>> past within the 31 days of recovery window.
>>
>> RMAN> run{
>>
>> 2> allocate channel dev1 type disk;
>>
>> 3> set until time "to_date('2011-28-06:20:55:36',
>> 'yyyy-dd-mm:hh24:mi:ss')";
>>
>> 4> restore database;
>>
>> 5> recover database;
>>
>> 6> }
>>
>> allocated channel: dev1
>>
>> channel dev1: SID=395 device type=DISK
>>
>> executing command: SET until clause
>>
>> .... (content truncated)
>>
>> media recovery complete, elapsed time: 00:00:01
>>
>> Finished recover at 01-JUL-11
>>
>> released channel: dev1
>>
>> RMAN>
>>
>>
>> SQL> alter database open resetlogs;
>>
>> Database altered.
>>
>>
>> From the output above, you can see we can recover the database to any
>> point in time within the 31 days of recovery window.
>>
>> 2- Backup Script number two:
>>
>> Without the until time clause
>>
>> RECOVER COPY OF DATABASE WITH TAG ‘LVL0_MERGE_INCR’;
>>
>>
>> [oracle@wissem backupset]$ rlrman target /
>>
>> Recovery Manager: Release 11.2.0.1.0 - Production on Tue Jun 28
>> 23:25:35 2011
>>
>> Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights
>> reserved.
>>
>> connected to target database: ORAWISS (DBID=3175451436)
>>
>> RMAN> run{
>> 2> set until time "to_date('2011-01-07:21:35:36',
>> 'yyyy-dd-mm:hh24:mi:ss')";
>> 3> restore database;
>> 4> recover database;
>> 5> }
>>
>> executing command: SET until clause
>>
>> Starting restore at 28-JUN-11
>> using target database control file instead of recovery catalog
>> allocated channel: ORA_DISK_1
>> channel ORA_DISK_1: SID=395 device type=DISK
>> allocated channel: ORA_DISK_2
>> channel ORA_DISK_2: SID=10 device type=DISK
>>
>> RMAN-00571:
>> ===========================================================
>> RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS
>> ===============
>> RMAN-00571:
>> ===========================================================
>> RMAN-03002: failure of restore command at 06/28/2011 23:25:53
>> RMAN-06026: some targets not found - aborting restore
>> RMAN-06023: no backup or copy of datafile 5 found to restore
>> RMAN-06023: no backup or copy of datafile 4 found to restore
>> RMAN-06023: no backup or copy of datafile 2 found to restore
>> RMAN-06023: no backup or copy of datafile 1 found to restore
>>
>> RMAN>
>>
>> We have all the backups, we cannot recover within the recovery window
>> of 31 days.
>> But, if we will have backups in tape, is it possible to have this
>> error?
>>
>>
>> Thank you
>>
>>
>
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