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Upcoming: Using RMAN in a Data Guard Environment


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Doc ID 740966.1



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Oracle Advisor Webcast

Using RMAN in a Data Guard

Environment Debbie Smedley

Senior Principal Technical Support Engineer


AGENDA

Presentation – approximately 45 minutes

Q&A Session – approximately 15 minutes

Web attendees can ask questions via Q&A panel only

Phone attendees can ask questions via Q&A panel or phone (operator

assisted)



Current schedule

Archived recordings

Doc ID 740966.1


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Oracle Advisor Webcast

Using RMAN in a Data Guard

Environment Debbie Smedley

Senior Principal Technical Support Engineer


Objectives

To understand

Archivelog Deletion Policy

Recovery Catalog Usage with DG

Procedure to rollforward

a standby using Incremental Backup


Agenda


Troubleshooting RMAN-08137

RMAN CATALOG and db_unique_name

Standby Rollforward using Incremental Backup

– Physical Schema Considerations

– Process Flow

Demo


Archive Log Deletion

Only logs in FRA can be automatically deleted

Default deletion under space pressure if

– archivelog has been backed up

OR

– archivelog is obsolete per RMAN Retention Policy

Use of FRA for archivelogs needs an RMAN Retention Policy

Retention policy needs RMAN Database Backup


Archive Log Deletion Policy 10G

Non-FRA Archivelogs must be explicitly deleted

Ignored by all delete mechanisms

Values:

APPLIED ON STANDBY | NONE | CLEAR

RMAN>backup archivelog ....DELETE INPUT;

RMAN>DELETE archivelog....;

RMAN>DELETE obsolete;


How to set Archive Log Deletion Policy in 10G

Primary Standby where

RMAN is used

Standby where no

RMAN is used

• APPLIED ON

STANDBY

•_log_deletion_policy

=ALL (331924.1 )

• NONE • APPLIED ON

STANDBY

(331924.1 )


Archive Log Deletion Policy 11G

Non-FRA Archivelogs must be explicitly deleted

Respected by all delete mechanisms

Values

– APPLIED ON [ALL] STANDBY

– SHIPPED TO [ALL] STANDBY

– BACKED UP integer TIMES TO DEVICE TYPE <device>

– NONE


How to set Archive Log Deletion Policy in 11G

Primary Standby where

RMAN is used

Standby where no

RMAN is used

• SHIPPED TO [ALL]

STANDBY

• APPLIED ON [ALL]

STANDBY

• BACKED UP N

TIMES TO DEVICE

TYPE <device>

• APPLIED ON [ALL]

STANDBY


RMAN-08137

Log is needed by Data Guard

Log is needed by Streams/Golden Gate

Log is needed by Guaranteed Restore Point

RMAN-08137: WARNING: archived log not deleted as it is still needed

RMAN-08120: WARNING: archived log not deleted, not yet applied by

standby



Data Guard

Logs that have not shipped will not appear in the output

SQL>select sequence#, archived, applied from v$archived_log where

dest_id=2 and status = 'A' and sequence# > <seq> ;

SEQUENCE# ARC APPLIED

---------- --- ---------

38 YES NO

37 YES NO

36 YES NO

39 YES NO

40 YES NO

41 YES NO



Restore Points

SQL> select scn, database_incarnation# inc,

guarantee_flashback_database, name from v$restore_point;

SCN INC GUA NAME

---------- --- --- ---------------

8195754 3 YES RERUNDEMO

SQL> select thread#, sequence# from v$archived_log where 8195754

between first_change# and next_change#;

THREAD# SEQUENCE#

---------- ----------

1 42

SQL>drop restore point RERUNDEMO;



Streams 10G

290143.1: Minimum Archived Log Necessary to Restart 10g and 11g Streams

Capture Process

Streams 11G

Alternatively

SQL>select min(required_checkpoint_scn)from dba_capture ;

SQL>select min_required_capture_change#from v$database ;

RMAN>delete noprompt force archivelog all completed before '<date>';



Upload to Oracle Support Services:

rman.log/rman.trc

Spfile/init.ora

Alert log

%export NLS_DATE_FORMAT= 'dd-mon-YY hh24:mi:ss'

%rman target / log rman.log trace rman.trc debug

RMAN>show all;

RMAN>delete…


RMAN 11G Use of Catalog with Data Guard

Primary

RMAN> list backup summary completed after 'sysdate -1';

List of Backups

===============

Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag

----- -- -- - ----------- ------------------ ------- ------- ---------- ---

962 B F A DISK 09-jun-13 18:02:37 1 1 NO FULL_PRIMARY



RMAN 11G Use of Catalog with Data Guard

RMAN> set backup files for device type disk to accessible;

RMAN> list backup summary completed after 'sysdate -1';

List of Backups

===============

Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag

----- -- -- - ----------- ------------------ ------- ------- ---------- ---



1408 B F A DISK 09-jun-13 18:08:01 1 1 NO FULL_STANDBY

1409 B F A DISK 09-jun-13 18:09:02 1 1 NO FULL_STANDBY

RMAN>set backup files for device type disk to notaccessible; (11.2)

RMAN>set backup files for device type disk to inaccessible; (11.1)


Standby Rollforward using Incremental Backup

Standby is far behind Primary

– Excessive number of archivelogs to be applied

– Required archivelogs no longer available

Wide spread corruption on Standby (nologging)

– Flashback database first

Advantages

– Much faster than redo apply

– No archivelogs to be applied

– LOGICAL corruptions from nologging updates avoided


Considerations

Changes to the physical schema

Files added to primary?

Files or tablespaces dropped from Primary?

New tablespaces transported into Primary?

Different naming conventions

– DB_FILE_NAME_CONVERT

– LOG_FIlE_NAME_CONVERT


Process Flow

Determine lowest file

checkpoint

<stbyscn>

Determine physical

schema changes

RMAN>backup

incremental from scn

<stbyscn> database;

RMAN>backup

datafile 7, 8;

RMAN>backup

current controlfile for

standby;

RMAN>restore

standby controflile;

RMAN>restore

datafile 7,8;

Rename files

RMAN>recover

database noredo;

S

T

A

N

D

B

Y

P

R

I

M

A

R

Y Transfer backups


Primary Backup

In order of preference:

1. NFS location /Tape

2. Local directory common to both eg /tmp

3. Local directory common to Primary only

RMAN is not host aware

Standby can ‘see’ backup if:

– Catalog is used

– Path/filename does not change on standby host


Demonstration


Summary



Using a catalog with Data Guard

Rollforward of a Standby database

using an incremental backup

What we covered today


Questions & Answers


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Further Info & Help

• Generic Advisor Webcast Note (Doc ID 740966.1)

• Database Advisor Webcast (Doc ID 1456176.1)

• DB Newsletter (Doc ID 1284265.1)

• MOS Community Database Backup and Recovery



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