Posts Tagged 12c New Features

Multisection Backup for Image Copies

A nice Oracle Database 12c New Feature enhances the multisection backup, introduced in 11g: You can use it now for image copies also!

Multisection Backup for an Image Copy

Multisection Backup for an Image Copy

RMAN> report schema;

using target database control file instead of recovery catalog
Report of database schema for database with db_unique_name PRIMA

List of Permanent Datafiles
===========================
File Size(MB) Tablespace           RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1    347      SYSTEM               YES     /u01/app/oracle/oradata/prima/system01.dbf
2    235      SYSAUX               NO      /u01/app/oracle/oradata/prima/sysaux01.dbf
3    241      UNDOTBS1             YES     /u01/app/oracle/oradata/prima/undotbs01.dbf
4    602      USERS                NO      /u01/app/oracle/oradata/prima/users01.dbf

List of Temporary Files
=======================
File Size(MB) Tablespace           Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1    40       TEMP                 32767       /u01/app/oracle/oradata/prima/temp01.dbt

RMAN> configure device type disk parallelism 2;

new RMAN configuration parameters:
CONFIGURE DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;
new RMAN configuration parameters are successfully stored

RMAN> backup section size 301m as copy datafile 4;

Starting backup at 29-JUN-15
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/prima/users01.dbf
backing up blocks 1 through 38528
channel ORA_DISK_2: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/prima/users01.dbf
backing up blocks 38529 through 77056
output file name=/u02/fra/PRIMA/datafile/o1_mf_users_bs2v934z_.dbf tag=TAG20150629T180658
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15
output file name=/u02/fra/PRIMA/datafile/o1_mf_users_bs2v934z_.dbf tag=TAG20150629T180658
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:15
Finished backup at 29-JUN-15

RMAN> host 'ls -rtl /u02/fra/PRIMA/datafile/';

total 616468
-rw-r-----. 1 oracle oinstall 631250944 Jun 29 18:07 o1_mf_users_bs2v934z_.dbf
host command complete

We use backupsets by default now especially also upon the DUPLICATE DATABASE command, which leads finally to image copies of course.

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What happens to the Standby when you move a datafile on the Primary?

In 12c, we have introduced online datafile movement as a new feature. Now does that impact an existing standby database? I got asked that yesterday during an online webinar. My answer was that I expect no impact at all on the standby database since redo apply doesn’t care about the physical placement of the datafile on the primary. But I added also that this is just an educated guess because I didn’t test that yet. Now I did:

You know, I like to practice what I preach: Don’t believe it, test it! :-)

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New 12c Default: Controlfile Autobackup On – But only for Multitenant

This a a little discovery from my present Oracle Database 12c New Features course in Copenhagen: The default setting for Controlfile Autobackup has changed to ON – but only for Multitenant, apparently:

$ rman target sys/oracle_4U@cdb1

Recovery Manager: Release 12.1.0.1.0 - Production on Wed Sep 24 13:28:39 2014

Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.

connected to target database: CDB1 (DBID=832467154)

RMAN> select cdb from v$database;

using target database control file instead of recovery catalog
CDB
---
YES

RMAN> show controlfile autobackup;

RMAN configuration parameters for database with db_unique_name CDB1 are:
CONFIGURE CONTROLFILE AUTOBACKUP ON; # default

Above you see the setting for a container database (CDB). Now an ordinary (Non-CDB) 12c Database:

$ rman target sys/oracle_4U@orcl

Recovery Manager: Release 12.1.0.1.0 - Production on Wed Sep 24 13:33:27 2014

Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.

connected to target database: ORCL (DBID=1386527354)

RMAN> select cdb from v$database;

using target database control file instead of recovery catalog
CDB
---
NO

RMAN> show controlfile autobackup;

RMAN configuration parameters for database with db_unique_name ORCL are:
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default

I really wonder why we have this difference! Is that still so with 12.1.0.2? Don’t believe it, test it! :-)

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