Upgrade from RAC 11.2.0.1 to 11.2.0.3 (Part III Create Standby database being synchronized from the 11.2.0.1 primary DB)

In Part I I've installed the Linux OS and prepared the shared filesystem (ISCSI configuration & OCFS2) 

In Part II I've prepared the Linux OS for the RAC installation, installed 11.2.0.3 Grid Infrastructure and Database software.

In this part I'll create a physical standby database under 11.2.0.3 Oracle Home on the new RAC server will be refreshed from the 11.2.0.1 primary database for the purpose of minimizing the downtime by eliminating the time wasted on copying the 11.2.0.1 datafiles from the old SAN to the new NAS where the new 11.2.0.3 resides. There are many technologies/means can do the same job and get you rid of creating a standby database for the purpose of minimize the time of copying datafiles to the new 11.2.0.3 server shared storage, as simple as just dismount the file system where the datafiles located from the old 11.2.0.1 server and mount it on the new servers if the new server are connected to the same SAN/NAS (this will be done from the NAS/SAN console), or utilize a new technology like SAN to SAN replication if the new 11.2.0.3 servers are connected to different SAN/NAS storage, that was just an example but there are many other solutions in the market can get this job done without creating a standby DB.

Any ways I'll take the hard & cheapest route and create a standby database on the new 11.2.0.3 servers located on the new NAS storage, again I'm doing so for the purpose of minimizing the copying time of datafiles during the upgrade phase.

My primary database is located on SAN storage connected to 11.2.0.1 RAC server through fiber cables, the new 11.2.0.3 database will be located on NAS storage connected to 11.2.0.3 servers through Ethernet using ISCSI protocol. (ISCSI configuration and file system preparation already done in Part I).

This post can be also used to create a standby database for disaster recovery purpose.

It's good to know the following:

License:

-------

-Data Guard license comes free with Enterprise Edition license.

Docs:

----

Standby Creation: -Single Node- Oracle Doc.

http://download.oracle.com/docs/cd/B28359_01/server.111/b28294/create_ps.htm

Standby Creation: -RAC 2 nodes- MAA.

http://www.oracle.com/technetwork/database/features/availability/dataguard11g-rac-maa-1-134639.pdf

Also Check this OBE link:

http://www.oracle.com/technology/obe/demos/11gr2/dg/04_DG_RMAN_create_phys_sby/04_dg_rman_create_phys_sby_viewlet_swf.html

Creating a Standby DB on a different OS/Endian than primary: [Metalink Note ID 413484.1]

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

If the primary OS is:          Standby DB can be created on the following OS:

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

Linux (32-bit)   Linux (32-bit)

           Microsoft Windows (32-bit)  =>Oracle 11g onward

           Linux (64-bit)                          =>Oracle 10g onward

Linux (64-bit)   Linux (64-bit)

            Linux (32-bit)                   =>Oracle 10g onward

            Microsoft Windows (64-bit)  =>Oracle 11g onward  

            Microsoft Windows (32-bit)  =>Oracle 11g onward  

            Solaris (64-bit) -Non SPark-  =>Oracle 11g onward

Microsoft Windows (32-bit) Microsoft Windows (32-bit)

             Microsoft Windows (64-bit)  =>Oracle 10g onward

             Linux (32-bit)             =>Oracle 11g onward

             Linux (64-bit)              =>Oracle 11g onward

Microsoft Windows (64-bit) Microsoft Windows (64-bit)

             Microsoft Windows (32-bit)  =>Oracle 10g onward

             Linux (32-bit)             =>Oracle 11g onward

             Linux (64-bit)              =>Oracle 11g onward

Solaris (64-bit)Non SPark    Solaris (64-bit) -Non SPark-

             Solaris (32-bit) -Non SPark- =>Oracle 10g onward

             Linux (64-bit)             =>Oracle 11g onward

Note: to see all operating systems endians run the following:

SQL> SELECT *FROM V$TRANSPORTABLE_PLATFORM;

Note: to see your OS endian run the following:

SQL> SELECT PLATFORM_ID,PLATFORM_NAME FROM V$DATABASE;

In brief, the main steps of creating a standby database are the following:

1. Perform an RMAN backup of the primary database.

2. Create the standby controlfile of the primary database.

3. Copy the backup of primary database/standby controlfile/SPFILE to the standby DB server.

4. Copy the password file orapw to the standby DB server.

5. Restore the SPFILE and standby controlfile on the standby DB.

6. Restore the database from the RMAN backup.

7. Configure both primary and standby database with Data Guard initialization parameters.

8. Start Managed Recovery Process to automate recovering the standby DB.

Note: the first three steps can be done in one step if RMAN command “duplicate target database for standby from active database” used to create the standby database.

Extra steps are related to Oracle Maximum Availability Architecture (MAA)

To get a deep knowledge of Data Guard Maximum Availability Architecture technical practices I strongly recommend this paper:

http://www.dbaexpert.com/dg/AutomateDGBestPractices.pdf

Now let's get started...

########################

Operating System Preparation:

########################

I'll refer to the 11.2.0.1 database | server as primary. (ora1121-node1 & ora1121-node2)

I'll refer to the 11.2.0.3 database | server as standby. (ora1123-node1 & ora1123-node2)

Host equivalence between primary servers and standby server:

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

On Primary Node1:

cd /home/oracle/.ssh

scp authorized_keys oracle@ora1123-node1:/home/oracle/.ssh/authorized_keys.primary

On Standby Node1:

cd /home/oracle/.ssh

cat authorized_keys.primary >> authorized_keys

Now the authorized_keys file on standby node1 has all keys for both Primary & standby servers, now we will overwrite this file on all primary RAC nodes to complete the host equivalence between all primary and standby nodes.

scp authorized_keys oracle@ora1123-node2:/home/oracle/.ssh/authorized_keys

scp authorized_keys oracle@ora1121-node1:/home/oracle/.ssh/authorized_keys

scp authorized_keys oracle@ora1121-node2:/home/oracle/.ssh/authorized_keys

On Primary node1: (by oracle user) Answer all question with YES

ssh ora1121-node1 date

ssh ora1121-node2 date

ssh ora1123-node1 date

ssh ora1123-node2 date

On Primary node2: (by oracle user) Answer all question with YES

ssh ora1121-node1 date

ssh ora1121-node2 date

ssh ora1123-node1 date

ssh ora1123-node2 date

On Standby node1: (by oracle user) Answer all question with YES

ssh ora1121-node1 date

ssh ora1121-node2 date

ssh ora1123-node1 date

ssh ora1123-node2 date

On Standby node2: (by oracle user) Answer all question with YES

ssh ora1121-node1 date

ssh ora1121-node2 date

ssh ora1123-node1 date

ssh ora1123-node2 date

#######################

Create The Standby Database:

#######################

Create Directories Tree:

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

On Standby node1:

mkdir -p /u01/oracle/11.2.0.3/db/diagnostics/pefms

mkdir -p /u01/oracle/diag/tnslsnr/ora1123-node1/listener_pefms1

mkdir -p /ora_control1/pefms

mkdir -p /ora_control2/pefms

mkdir -p /ora_redo1/pefms

mkdir -p /ora_redo2/pefms

mkdir -p /ora_archive1/pefms

mkdir -p /ora_archive2/pefms

mkdir -p /ora_temp1/pefms

mkdir -p /ora_undo2/pefms

mkdir -p /ora_undo1/pefms

mkdir -p /ora_index1/pefms

mkdir -p /ora_data1/pefms

mkdir -p /ora_backupdisk/flash_recovery_area/PEFMS/flashback

chown -R oracle:oinstall /ora_control1

chown -R oracle:oinstall /ora_control2

chown -R oracle:oinstall /ora_redo1

chown -R oracle:oinstall /ora_redo2

chown -R oracle:oinstall /ora_archive1

chown -R oracle:oinstall /ora_archive2

chown -R oracle:oinstall /ora_temp1

chown -R oracle:oinstall /ora_undo1

chown -R oracle:oinstall /ora_undo2

chown -R oracle:oinstall /ora_index1

chown -R oracle:oinstall /ora_data1

chown -R oracle:oinstall /ora_backupdisk

chmod -R 750 /ora_control1

chmod -R 750 /ora_control2

chmod -R 750 /ora_redo1

chmod -R 750 /ora_redo2

chmod -R 750 /ora_archive1

chmod -R 750 /ora_archive2

chmod -R 750 /ora_temp1

chmod -R 750 /ora_undo1

chmod -R 750 /ora_undo2

chmod -R 750 /ora_index1

chmod -R 750 /ora_data1

chmod -R 750 /ora_backupdisk

Create the listener.ora and tnsnames.ora files:

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

vi $ORACLE_HOME/network/admin/listener.ora

# Add the following lines

LISTENER=

  (DESCRIPTION=

    (ADDRESS_LIST=

      (ADDRESS=(PROTOCOL=tcp)(HOST=ora1123-node1)(PORT=1521))))

SID_LIST_LISTENER=

  (SID_LIST=

    (SID_DESC=

     (SDU=32767)

      (ORACLE_HOME=/u01/oracle/11.2.0.3/db)

      (SID_NAME=pefms1)))

Note: this line (SDU=32767) is part of MAA.

vi $ORACLE_HOME/network/admin/tnsnames.ora

# Add the following lines

pefm1=(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (Host = ora1123-node1) (Port = 1521))) (CONNECT_DATA = (SID = pefms1)))

pefms_pri=(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (Host = idub-ora-node1) (Port = 1521))) (CONNECT_DATA = (SID = pefms1)))

pefms_dr=(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (Host = ora1123-node1) (Port = 1521))) (CONNECT_DATA = (SID = pefms1)))

The last two entries will be used later in the standby configurations to help copying the redo data and fixing the gaps between the primary and the standby DB.

Copy the Password File from primary to standby:

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

On Primary node1:

# cd /u01/oracle/11.2.0.3/db/11.2.0.1/dbs

# scp orapwpefms1 oracle@ora1123-node1:/u01/oracle/11.2.0.3/db/dbs

 In case there is no password file created yet on the primary server:

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

On Primary node1:

 Stop the case sensitivity for password:

 SQL> ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON=FALSE SCOPE=BOTH;

 Create the password file:

 # cd $ORACLE_HOME/dbs

 # orapwd file=orapwpefms1 password=xxxxxxxxx ignorecase=y

 Copy the password file to the standby node1:

 # scp orapwpefms2 oracle@ora1123-node1:/u01/oracle/11.2.0.3/db/dbs/orapwpefms

 Reboot the Primary DB

 Return back the case sensitivity parameter:

 SQL> ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON=TRUE SCOPE=BOTH;

On Standby node1:

Create SQLNET.ora file:

# vi $ORACLE_HOME/network/admin/sqlnet.ora

#Add this parameter to sqlnet.ora file:

NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)

Create the pfile:

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

Total Memory:  33G

Memory reserved for OS: 5G

Memory reserved for DB: 28G

 -SGA  18G

  -Minimum DB_CACHE 8G

  -Minimum SHARED         2G

  -Minimum LARGE         300M

  -Minimum JAVA         100M

  -Log Buffer                 30M

 -PGA  10G

  -Minimum  SORTAREA   80M

# vi $ORACLE_HOME/dbs/initpefms1.ora

#Memory Parameters:

##################

sga_max_size=19327352832

sga_target=19327352832

*.db_cache_size=8589934592

*.java_pool_size=104857600

*.large_pool_size=314572800

*.shared_pool_reserved_size=52428800

*.shared_pool_size=2618767104

*.sort_area_size=83886080

*.log_buffer=31457280

*.pga_aggregate_target=10737418240

#Destination Parameters:

#######################

*.control_files='/ora_control1/pefms/control01.ctl','/ora_control2/pefms/control02.ctl'

*.db_recovery_file_dest='/ora_backupdisk/flash_recovery_area'

*.diagnostic_dest='/u01/oracle/11.2.0.3/db/diagnostics/pefms'

*.log_archive_dest_1='LOCATION=/ora_archive1/pefms'

#Other Parameters:

#################

*.compatible='11.2.0.1'

*.db_flashback_retention_target=21600

*.db_name='pefms'

*.db_recovery_file_dest_size=536870912000

*.fast_start_mttr_target=300

instance_name='pefms1'

log_archive_config='dg_config=(pefms_pri,pefms_dr)'

*.log_archive_dest_state_1='ENABLE'

*.log_archive_format='%d_%t_%r_%s.arc'

*.log_archive_max_processes=3

*.open_cursors=500

*.processes=1000

*.remote_login_passwordfile='EXCLUSIVE'

*.resource_limit=TRUE

*.standby_file_management='AUTO'

thread=1

*.undo_management='AUTO'

*.undo_retention=172800

undo_tablespace='UNDOTBS1'

*.fal_server='PEFMS_PRI'

*.fal_client='PEFMS_DR'

*.db_unique_name='pefmsdr'

Note: Parameter db_unique_name must be set to "pefmsdr"

Note: Parameter log_archive_config must be set to "'dg_config=(pefms_pri,pefms_dr)'".

On the Primary Node1:

Backup the primary database:

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

# $ORACLE_HOME/bin/rman target /

RMAN> run {

allocate channel c1 type disk;

allocate channel c2 type disk;

allocate channel c3 type disk;

allocate channel c4 type disk;

change archivelog all crosscheck;

backup as compressed backupset incremental level=0 format '/backupdisk/rmanbkps/%d_%t_%s_%p' tag='fullprodbk'

filesperset 100 database plus archivelog;

}

copy the backup to the DR server:

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

# cd /backupdisk/rmanbkps/

# scp * oracle@ora1123-node1:/ora_backupdisk/rmanbkps

create standby controlfile: -On primary-

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

SQL> alter database create standby controlfile as '/home/oracle/standby.ctl' reuse;

move it to the standby server:

# scp /home/oracle/standby.ctl oracle@ora1123-node1:/ora_control1/pefms/control01.ctl

On the standby Node1:

Start the Standby database creation:

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

Multiplex the standby controlfiles:

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

# cp /ora_control1/pefms/control01.ctl /ora_control2/pefms/control02.ctl

# chmod 640 /ora_control1/pefms/control01.ctl

# chmod 640 /ora_control2/pefms/control02.ctl

Mount the standby DB:

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

# sqlplus '/ as sysdba' 

SQL> STARTUP NOMOUNT;

SQL> create spfile='/u01/oracle/11.2.0.3/db/dbs/spfilepefms1.ora' from pfile='/u01/oracle/11.2.0.3/db/dbs/initpefms1.ora';

SQL> alter database mount standby database;

SQL> exit

Catalog the RMAN backup been copied from Primary site, start DB restoration:

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

# $ORACLE_HOME/bin/rman target /

RMAN> catalog start with '/ora_backupdisk/rmanbkps/';

RMAN> restore database;

When it done check the archives inside the backup:

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

RMAN> list backup of archivelog all; 

RMAN> list backup of archivelog from time 'sysdate-10/24';

Recover the database to the latest scn you have in the backup:

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

RMAN> recover database until scn xxx;

No need to worry about the following error, just move to the next step:

ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below

ORA-01152: file 1 was not restored from a sufficiently old backup 

ORA-01110: data file 1: '/ora_data1/pefms/system01.dbf'

Put the standby database in recover managed mode:

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

SQL> alter database recover managed standby database disconnect from session;  

set log_archive_config:

SQL> alter system set log_archive_config='dg_config=(pefms_pri,pefms_dr)' sid='*' scope=both;

Note: pefms_pri & pefmsdr are two services already added to tnsnames.ora file located on the standby node1, pefms_pri will point to the primary DB in the primary server and pefms_dr pointing to the standby database on the standby server.

Now you have a standby database............................

Start the listener:

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

# lsnrctl start

Configure archive logs shipping:

########################

On Primary Node1:

Set the primary database in FORCE LOGGING mode, to ensure that all transactions are being written to the redologs:

SQL> ALTER DATABASE FORCE LOGGING;

=insert the following lines inside the tnsnames.ora located on the primary node1 that represent PEFMS_DR service:

PEFMS_DR =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = ora1123-node1)(PORT = 1521))

    )

    (CONNECT_DATA =

      (SERVICE_NAME = pefms1)

    )

  )

Note: Make sure that the DR is in the mount mode.

On Primary Node1:

SQL> alter system set log_archive_config='dg_config=(PEFMS_DR,PEFMS)' sid='*' scope=both;

SQL> alter system set log_archive_dest_3='service="PEFMS_DR" valid_for=(online_logfiles,primary_role) db_unique_name=PEFMS_DR sid='*' scope=both;

SQL> alter system set log_archive_dest_state_3='enable' scope=both sid='*';

SQL> alter system set standby_file_management=auto sid='*' scope=both;

SQL> alter system set fal_server='PEFMS_DR' sid='*' scope=both;

SQL> alter system set fal_client='PEFMS1' sid='pefms1' scope=both;

SQL> alter system set fal_client='PEFMS2' sid='pefms2' scope=both;

SQL> alter system set service_names='PEFMS' sid='*' scope=both;

The following are MAA recommendations:

SQL> ALTER SYSTEM SET ARCHIVE_LAG_TARGET=1800 sid='*' scope=both;

     -->REDOLOG switch will be forced every 30min.

SQL> ALTER SYSTEM SET LOG_ARCHIVE_MAX_PROCESSES=4 sid='*' scope=both;

     -->To quickly resolve gaps in the redo stream to a standby database.

Create standby redo logs on the primary database: (MAA)

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

- Even though standby redo logs are required for maximum protection and maximum availability modes and with the LGWR ASYNC transport mode and not required for Maximum Performance mode (which I'm using), it's recommend to create them as they will speed up (redo transport, data recovery, speedup the switchover).

- As the primary database possibly becoming the standby database as a result of a database switchover or failover, standby redologs should be created on the primary database as well.

The minimum number of standby redolog groups is = the number of online redo logs.

The best practice: Number of standby redologs = (Number of redologs on production) +1

Standby redologs size = Primary redologs size

Standby redologs should not be multiplexed.

SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 

 GROUP 7 ('/ora_redo1/pefms/pefms1_redo07_a.log')SIZE 100M reuse,

 GROUP 8 ('/ora_redo1/pefms/pefms1_redo08_a.log')SIZE 100M reuse,

 GROUP 9 ('/ora_redo1/pefms/pefms1_redo09_a.log')SIZE 100M reuse,

 GROUP 10('/ora_redo1/pefms/pefms1_redo10_a.log')SIZE 100M reuse;

SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 2

 GROUP 11 ('/ora_redo1/pefms/pefms2_redo11_a.log')SIZE 100M reuse,

 GROUP 12 ('/ora_redo1/pefms/pefms2_redo12_a.log')SIZE 100M reuse,

 GROUP 13 ('/ora_redo1/pefms/pefms2_redo13_a.log')SIZE 100M reuse,

 GROUP 14 ('/ora_redo1/pefms/pefms2_redo14_a.log')SIZE 100M reuse;

SQL> SELECT * FROM V$LOG;

SQL> SELECT * FROM V$STANDBY_LOG;

On the Standby Node1:

##################

create standby redo logs on the standby database:

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

SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 1

 GROUP 7 ('/ora_redo1/pefms/pefms1_redo07_a.log')SIZE 100M reuse,

 GROUP 8 ('/ora_redo1/pefms/pefms1_redo08_a.log')SIZE 100M reuse,

 GROUP 9 ('/ora_redo1/pefms/pefms1_redo09_a.log')SIZE 100M reuse,

 GROUP 10('/ora_redo1/pefms/pefms1_redo10_a.log')SIZE 100M reuse;

SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 2

 GROUP 11 ('/ora_redo1/pefms/pefms2_redo11_a.log')SIZE 100M reuse,

 GROUP 12 ('/ora_redo1/pefms/pefms2_redo12_a.log')SIZE 100M reuse,

 GROUP 13 ('/ora_redo1/pefms/pefms2_redo13_a.log')SIZE 100M reuse,

 GROUP 14 ('/ora_redo1/pefms/pefms2_redo14_a.log')SIZE 100M reuse;

SQL> alter system set standby_file_management='AUTO';

SQL> SELECT * FROM V$LOG;

     SELECT * FROM V$STANDBY_LOG;

Maximum Availability Architecture (MAA) recommendations:

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

> Speed up the parallel recovery:

     SQL> ALTER SYSTEM SET parallel_execution_message_size=16384;

     -->16384 is the 11gr2 default, the larger the faster the parallel recovery

> On the standby DB you can shrink the SHARED_POOL to increase the DB_CACHE_SIZE, since the recovery process does not require much shared pool memory.

Enable Flashback on the Standby DB:

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

That helps in fixing logical corruption scenarios, easily re-instate the primary database after failing over to the standby.

SQL> ALTER database flashback on;

Enable the real-time apply on the standby database:

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

Apply the changes on the DR as soon as the redo data is received:

SQL> RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;

VERIFY DATA GUARD Archivelog shipping:

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

ON Primary:

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

SQL> ALTER SYSTEM ARCHIVE LOG CURRENT;

ON DR:

--------

SQL> SELECT DATABASE_ROLE,OPEN_MODE,PROTECTION_MODE from v$database;

     SELECT THREAD#,SEQUENCE#, FIRST_TIME, NEXT_TIME,applied FROM V$ARCHIVED_LOG ORDER BY SEQUENCE#,applied;

     SELECT thread#,max(SEQUENCE#) from v$archived_log group by thread#;

Parallel the recovery process:

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

SQL> ALTER system set recovery_parallelism=16 scope=spfile;

Check the time lag between Primary & Standby:

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

SQL> col NAME for a15

          col VALUE for a15

          SELECT NAME,VALUE FROM V$DATAGUARD_STATS WHERE NAME='apply lag';

NAME  VALUE

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

apply lag +00 00:04:43

The lag is 4.43 minutes

RMAN configuration:

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

# rman target /

RMAN> CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/ora_backupdisk/rmanbkps/controlfiles/%F';

Add the database services to the clusterware:

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

If you want the database and the listener to be managed by clusterware:

# srvctl add database -d pefms -o /u01/oracle/11.2.0.3/db

# srvctl add instance -d pefms -i pefms1 -n ora1123-node1

# srvctl add listener -o /u01/oracle/11.2.0.3/db -l LISTENER_PEFMS1 -s

Now the standby DB is done.

Next:

In the next part Part IV I'll cover the steps of upgrading this standby DB from 11.2.0.1 to 11.2.0.3 and configure it with RAC and make it ready for production use.

The following information is good to know about Data Guard:

Using compression option for (ASYNC only) -one of 11g new features-. (compression=enable)

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

redo compression can:

-Improve data protection by reducing redo transport lag.

-Reduce network utilization.

-Provide faster redo gap resolution.

-Reduce redo transfer time.

-Need to buy advanced compression license.

To implement:

             --Use compression=enable in the dest_* parameter

      --alter system set "_REDO_TRANSPORT_COMPRESS_ALL"=TRUE scope=both;

>This option is recommended when the link speed between the primary and the standby.

 is not fast enough.

Discover ARCHIVE_DEST_N options:

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

reopen: The time that the primary database reconnect to standby DB when connection cut between.

compression: Requires the Oracle Advanced Compression license, it compress redo data when transfer it to DR.[ID 729551.1]

             If you're using Maximum Performance, consider setting _REDO_TRANSPORT_COMPRESS_ALL=TRUE

DELAY:  delay sending redo data, to mitigate potential human induced errors and logical corruption. I don't recommend to set it

        The best approach is to delay applying the redo data on the standby DB or to use FLASHBACK DATABASE feature on both sites.

Examples:

--SQL> alter system set log_archive_dest_3='service="PEFMS_DR" valid_for=(online_logfiles,primary_role) db_unique_name=PEFMS_DR DELAY=240' sid='*' scope=both;

--SQL> alter system set log_archive_dest_3='service="PEFMS_DR" valid_for=(online_logfiles,primary_role) db_unique_name=PEFMS_DR delay=60 sid='*' scope=both;

--SQL> alter system set log_archive_dest_3='service="PEFMS_DR", ARCH NOAFFIRM delay=0 optional reopen=15 register max_failure=10 db_unique_name=PEFMS_DR 

compression=enable';

Note: In case of using compression option alter below parameter:

--SQL> alter system set "_REDO_TRANSPORT_COMPRESS_ALL"=TRUE scope=both;

Using maximum availability option with LGWR with SYNC:

--SQL> alter system set log_archive_dest_3='service=PEFMS_DR LGWR SYNC AFFIRM db_unique_name=PEFMS_DR VALID_FOR=(ALL_LOGFILES,PRIMARY_ROLE) compression=enable';

--SQL> Alter database set standby database to maximize availability;

reboot the production and the standby databases.