Creating a physical standby database on Oracle 11.2.0.1.0 using RMAN :-
OS Version:-Red Hat Enterprise Linux Server release 6.4
Oracle version:- Oracle Database 12c Enterprise Edition Release 11.2.0.1.0 64bit
Primary database:- prim
Standby database:- stand
System Configuration
primary server:-
edit the following files
vi /etc/hosts
192.168.2.102 server1.soumya.com server1
192.168.2.104 server2.soumya.com server2
:wq
vi /etc/sysconfig/network
HOSTNAME=server1.soumya.com
:wq
vi /etc/sysconfig/network-scripts/ifcfg-eth0
NETMASK=255.255.255.0
IPADDR=192.168.2.102
GATEWAY=192.168.2.1
:wq
Standby Server:-
edit the following files
vi /etc/hosts
192.168.2.102 server1.soumya.com server1
192.168.2.104 server2.soumya.com server2
:wq
vi /etc/sysconfig/network
HOSTNAME=server2.soumya.com
:wq
vi /etc/sysconfig/network-scripts/ifcfg-eth0
NETMASK=255.255.255.0
IPADDR=192.168.2.104
GATEWAY=192.168.2.1
:wq
In both server-- # service network restart
# service NetworkManager restart
# service iptables stop
# chkconfig iptables off
#vi /etc/selinux/config and disable selinux .
After changing inside the file please restart the server.
We have a database called prim on primary server and we will install only oracle binaries on
standby server(192.168.2.104).No database should be running in standby server.
Oracle Net configuration:-
Listener.ora configuration for primary database (prim) in primary server (192.168.2.102)
vi $ORACLE_HOME/network/admin/listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = prim)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = prim)
)
)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server1.soumya.com)(PORT = 1521))
)
ADR_BASE_LISTENER = /u01/app/oracle
:wq
Listener.ora configuration for standby database (stand) in standby server (192.168.2.104)
vi $ORACLE_HOME/network/admin/listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = stand)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = stand)
)
)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server2.soumya.com)(PORT = 1521))
)
ADR_BASE_LISTENER = /u01/app/oracle
:wq
On both server(192.168.2.102 & 192.168.2.104), add Oracle Net aliases for both databases and aux alias for RMAN DUPLICATE in
tnsnames.ora:
vi $ORACLE_HOME/network/admin/tnsnames.ora
prim =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server1.soumya.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = prim)
)
)
stand =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server2.soumya.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = stand)
)
)
-save & exit(:wq )
Now we will have to start listener in primary and standby server:-
$ lsnrctl start
Check "tnsping prim" & "tnsping stand" in both server. If output of both command is
coming as "ok" that means oracle net service has been added successfully.
In primary database:-
Put the database in archivelog mode.
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 2
Current log sequence 4
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 629145600 bytes
Fixed Size 2927528 bytes
Variable Size 511706200 bytes
Database Buffers 109051904 bytes
Redo Buffers 5459968 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 2
Next log sequence to archive 4
Current log sequence 4
SQL> alter database open;
In Primary Database:-
Enable force logging The FORCE LOGGING option to ensure that all the changes made in the database
will be captured and available for recovery in the redo logs.
SQL> alter database force logging;
Database altered.
SQL> select force_logging from v$database;
FORCE_LOGGING
---------------------------------------
YES
Create a password file
$ orapwd file=$ORACLE_HOME/dbs/orapwprim password=redhat
$ cd $ORACLE_HOME/dbs/
$ chmod 775 orapwprim
$ cp orapwprim orapwstand
Now transfer the password file into standby server using scp command
$ scp orapwstand oracle@192.168.2.104:/u01/app/oracle/product/11.2.0/db_1/dbs/
Add following parameter in pfile for primary database.
create pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora' from spfile;
vi /u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora
*.db_name='prim'
*.db_unique_name='prim'
*.log_archive_config='DG_CONFIG=(prim, stand)'
*.log_archive_dest_1='LOCATION=/u01/app/oracle/flash_recovery_area VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=prim'
*.log_archive_dest_2='SERVICE=stand LGWR ASYNC VALID_FOR=(ALL_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stand'
*.log_archive_dest_state_1=enable
*.log_archive_dest_state_2=enable
*.FAL_SERVER=stand
*.FAL_CLIENT=prim
*.db_file_name_convert='/u01/app/oracle/oradata/stand/','/u01/app/oracle/oradata/prim/'
*.log_file_name_convert='/u01/app/oracle/oradata/stand/','/u01/app/oracle/oradata/prim/'
*.standby_file_management=auto
-save & exit(:wq)
SQL> shut immediate;
SQL> startup mount pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora';
SQL> create spfile from pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora';
SQL> alter database open;
Total System Global Area 413372416 bytes
Fixed Size 2213896 bytes
Variable Size 339740664 bytes
Database Buffers 67108864 bytes
Redo Buffers 4308992 bytes
Database mounted.
Database opened.
At Standby database:-
Create the necessary directory structure:-
$ mkdir -p /u01/app/oracle/oradata/stand/
$ mkdir -p /u01/app/oracle/admin/stand/adump
$ mkdir -p /u01/app/oracle/flash_recovery_area/stand/
$ chmod 775 -Rf /u01
Configure .bash_profile
[oracle@server2 ~]$ vi .bash_profile
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH
export TMP=/tmp
export TMPDIR=$TMP
export ORACLE_HOSTNAME=server2.soumya.com
export ORACLE_UNQNAME=stand
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export ORACLE_SID=stand
export PATH=/usr/sbin:$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib:/usr/lib64
export CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib
Now start the instance in nomount mode with minimal options
vi initstand.ora
DB_NAME=prim
DB_UNIQUE_NAME=stand
DB_BLOCK_SIZE=8192
:wq
SQL> startup nomount pfile='/home/oracle/initstand.ora';
ORACLE instance started.
Total System Global Area 413372416 bytes
Fixed Size 2213896 bytes
Variable Size 339740664 bytes
Database Buffers 67108864 bytes
Redo Buffers 4308992 bytes
At primary database:-
Add the standby redologs.
SQL> select group#, members , bytes /1024 /1024 from v$log;
GROUP# MEMBERS BYTES/1024/1024
---------- ---------- ---------------
1 1 50
2 1 50
3 1 50
SQL> select group# , member from v$logfile;
GROUP# MEMBER
---------- --------------------------------------------------
3 /u01/app/oracle/oradata/prim/redo03.log
2 /u01/app/oracle/oradata/prim/redo02.log
1 /u01/app/oracle/oradata/prim/redo01.log
SQL> alter database add standby logfile group 4 '/u01/app/oracle/oradata/prim/redos4A.log' size 50M;
SQL> alter database add standby logfile group 5 '/u01/app/oracle/oradata/prim/redos5A.log' size 50M;
SQL> alter database add standby logfile group 6 '/u01/app/oracle/oradata/prim/redos6A.log' size 50M;
SQL> alter database add standby logfile group 7 '/u01/app/oracle/oradata/prim/redos7A.log' size 50M;
SQL> select group# , member from v$logfile;
GROUP# MEMBER
---------- --------------------------------------------------------------------------------
3 /u01/app/oracle/oradata/prim/redo03.log
2 /u01/app/oracle/oradata/prim/redo02.log
1 /u01/app/oracle/oradata/prim/redo01.log
4 /u01/app/oracle/oradata/prim/redos4A.log
5 /u01/app/oracle/oradata/prim/redos5A.log
6 /u01/app/oracle/oradata/prim/redos6A.log
7 /u01/app/oracle/oradata/prim/redos7A.log
At standby database:-
Now once the redoglogs have been created in primary database,we will create the following RMAN run commands and the changes to the standby’s spfile in this RMAN block.
[oracle@server2 ]rman target sys/redhat@prim auxiliary sys/redhat@stand
Recovery Manager: Release 11.2.0.1.0 - Production on Mon Sep 7 14:43:25 2015
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: PRIM (DBID=4130009889)
connected to auxiliary database: PRIM (not mounted)
RMAN>run {
allocate channel prmy1 type disk;
allocate channel prmy2 type disk;
allocate channel prmy3 type disk;
allocate channel prmy4 type disk;
allocate auxiliary channel stby type disk;
duplicate target database for standby from active database
spfile
parameter_value_convert 'prim','stand'
set db_unique_name='stand'
set db_file_name_convert='/u01/app/oracle/oradata/prim/','/u01/app/oracle/oradata/stand/'
set log_file_name_convert='/u01/app/oracle/oradata/prim/','/u01/app/oracle/oradata/stand/'
set control_files='/u01/app/oracle/oradata/stand/control01.ctl','/u01/app/oracle/oradata/stand/control02.ctl'
set log_archive_max_processes='10'
set fal_client='stand'
set fal_server='prim'
set standby_file_management='AUTO'
set log_archive_config='dg_config=(prim,stand)'
set log_archive_dest_2='service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'
;
}
using target database control file instead of recovery catalog
allocated channel: prmy1
channel prmy1: SID=32 device type=DISK
allocated channel: prmy2
channel prmy2: SID=33 device type=DISK
allocated channel: prmy3
channel prmy3: SID=34 device type=DISK
allocated channel: prmy4
channel prmy4: SID=35 device type=DISK
allocated channel: stby
channel stby: SID=19 device type=DISK
Starting Duplicate Db at 16-MAY-13
contents of Memory Script:
{
backup as copy reuse
targetfile '/u01/app/oracle/product/11.2.0/db_1/dbs/orapwprim' auxiliary format
'/u01/app/oracle/product/11.2.0/db_1/dbs/orapwstand' targetfile
'/u01/app/oracle/product/11.2.0/db_1/dbs/spfileprim.ora' auxiliary format
'/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora' ;
sql clone "alter system set spfile= ''/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora''";
}
executing Memory Script
Starting backup at 16-MAY-13
Finished backup at 16-MAY-13
sql statement: alter system set spfile= ''/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora''
contents of Memory Script:
{
sql clone "alter system set audit_file_dest =
''/u01/app/oracle/oradata/dump/stand/adump'' comment=
'''' scope=spfile";
sql clone "alter system set diagnostic_dest =
''/u01/app/oracle/oradata/dump/stand'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_dest_1 =
''location=use_db_recovery_file_dest valid_for=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stand'' comment=
'''' scope=spfile";
sql clone "alter system set db_unique_name =
''stand'' comment=
'''' scope=spfile";
sql clone "alter system set db_file_name_convert =
''/u01/app/oracle/oradata/prim/prim/datafile/'', ''/u01/app/oracle/oradata/stand/stand/datafile/'' comment=
'''' scope=spfile";
sql clone "alter system set log_file_name_convert =
''/u01/app/oracle/oradata/prim/prim/onlinelog/'', ''/u01/app/oracle/oradata/stand/stand/onlinelog/'' comment=
'''' scope=spfile";
sql clone "alter system set control_files =
''/u01/app/oracle/oradata/stand/control/control01.ctl'', ''/u01/app/oracle/oradata/stand/control/control02.ctl'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_max_processes =
10 comment=
'''' scope=spfile";
sql clone "alter system set fal_client =
''stand'' comment=
'''' scope=spfile";
sql clone "alter system set fal_server =
''prim'' comment=
'''' scope=spfile";
sql clone "alter system set standby_file_management =
''AUTO'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_config =
''dg_config=(prim,stand)'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_dest_2 =
''service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'' comment=
'''' scope=spfile";
shutdown clone immediate;
startup clone nomount;
}
executing Memory Script
sql statement: alter system set audit_file_dest = ''/u01/app/oracle/oradata/dump/stand/adump'' comment= '''' scope=spfile
sql statement: alter system set diagnostic_dest = ''/u01/app/oracle/oradata/dump/stand'' comment= '''' scope=spfile
sql statement: alter system set log_archive_dest_1 = ''location=use_db_recovery_file_dest valid_for=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stand'' comment= '''' scope=spfile
sql statement: alter system set db_unique_name = ''stand'' comment= '''' scope=spfile
sql statement: alter system set db_file_name_convert = ''/u01/app/oracle/oradata/prim/prim/datafile/'', ''/u01/app/oracle/oradata/stand/stand/datafile/'' comment= '''' scope=spfile
sql statement: alter system set log_file_name_convert = ''/u01/app/oracle/oradata/prim/prim/onlinelog/'', ''/u01/app/oracle/oradata/stand/stand/onlinelog/'' comment= '''' scope=spfile
sql statement: alter system set control_files = ''/u01/app/oracle/oradata/stand/control/control01.ctl'', ''/u01/app/oracle/oradata/stand/control/control02.ctl'' comment= '''' scope=spfile
sql statement: alter system set log_archive_max_processes = 10 comment= '''' scope=spfile
sql statement: alter system set fal_client = ''stand'' comment= '''' scope=spfile
sql statement: alter system set fal_server = ''prim'' comment= '''' scope=spfile
sql statement: alter system set standby_file_management = ''AUTO'' comment= '''' scope=spfile
sql statement: alter system set log_archive_config = ''dg_config=(prim,stand)'' comment= '''' scope=spfile
sql statement: alter system set log_archive_dest_2 = ''service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'' comment= '''' scope=spfile
Oracle instance shut down
connected to auxiliary database (not started)
Oracle instance started
Total System Global Area 534462464 bytes
Fixed Size 2230072 bytes
Variable Size 163580104 bytes
Database Buffers 364904448 bytes
Redo Buffers 3747840 bytes
allocated channel: stby
channel stby: SID=18 device type=DISK
contents of Memory Script:
{
backup as copy current controlfile for standby auxiliary format '/u01/app/oracle/oradata/stand/control/control01.ctl';
restore clone controlfile to '/u01/app/oracle/oradata/stand/control/control02.ctl' from
'/u01/app/oracle/oradata/stand/control/control01.ctl';
}
executing Memory Script
Starting backup at 16-MAY-13
channel prmy1: starting datafile copy
copying standby control file
output file name=/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_prim.f tag=TAG20130516T084319 RECID=7 STAMP=815561001
channel prmy1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 16-MAY-13
Starting restore at 16-MAY-13
channel stby: copied control file copy
Finished restore at 16-MAY-13
contents of Memory Script:
{
sql clone 'alter database mount standby database';
}
executing Memory Script
sql statement: alter database mount standby database
contents of Memory Script:
{
set newname for tempfile 1 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_temp_8qbok7fk_.tmp";
switch clone tempfile all;
set newname for datafile 1 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf";
set newname for datafile 2 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf";
set newname for datafile 3 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf";
set newname for datafile 4 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf";
backup as copy reuse
datafile 1 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf" datafile
2 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf" datafile
3 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf" datafile
4 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf" ;
sql 'alter system archive log current';
}
executing Memory Script
executing command: SET NEWNAME
renamed tempfile 1 to /u01/app/oracle/oradata/stand/stand/datafile/o1_mf_temp_8qbok7fk_.tmp in control file
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting backup at 16-MAY-13
channel prmy1: starting datafile copy
input datafile file number=00001 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_system_8ocl7bho_.dbf
channel prmy2: starting datafile copy
input datafile file number=00002 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_sysaux_8ocl7k6n_.dbf
channel prmy3: starting datafile copy
input datafile file number=00003 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf
channel prmy4: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_users_8qbolh3g_.dbf
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf tag=TAG20130516T084335
channel prmy3: datafile copy complete, elapsed time: 00:00:45
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf tag=TAG20130516T084335
channel prmy4: datafile copy complete, elapsed time: 00:00:55
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf tag=TAG20130516T084335
channel prmy1: datafile copy complete, elapsed time: 00:01:05
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf tag=TAG20130516T084335
channel prmy2: datafile copy complete, elapsed time: 00:01:05
Finished backup at 16-MAY-13
sql statement: alter system archive log current
contents of Memory Script:
{
switch clone datafile all;
}
executing Memory Script
datafile 1 switched to datafile copy
input datafile copy RECID=7 STAMP=815561103 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf
datafile 2 switched to datafile copy
input datafile copy RECID=8 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=9 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=10 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf
Finished Duplicate Db at 16-MAY-13
released channel: prmy1
released channel: prmy2
released channel: prmy3
released channel: prmy4
released channel: stby
RMAN> exit
Now at standby database:-
SQL>shut immediate;
SQL>startup mount
SQL>alter database recover managed standby database disconnect from session;
Now for real time apply:-
SQL> alter database recover managed standby database cancel;
SQL> alter database open;
SQL> alter database recover managed standby database using current logfile disconnect from session;
SQL>select open_mode from v$database; (Output : read only with apply)
There are various ways to see if this is working or not. You can use it in the following query to see what was the last archive received/applied in the Standby Database.
On standby database
SQL> SELECT 'Last Applied : ' Logs,
TO_CHAR(next_time,'DD-MON-YY:HH24:MI:SS') TIME,thread#,sequence#
FROM v$archived_log
WHERE sequence# =
(SELECT MAX(sequence#) FROM v$archived_log WHERE applied='YES'
)
UNION
SELECT 'Last Received : ' Logs,
TO_CHAR(next_time,'DD-MON-YY:HH24:MI:SS') TIME,thread#,sequence#
FROM v$archived_log
WHERE sequence# =
(SELECT MAX(sequence#) FROM v$archived_log );
LOGS TIME THREAD# SEQUENCE#
---------------- ------------------ ---------- ----------
Last Applied : 07-SEP-15:11:53:22 1 17
Last Received : 07-SEP-15:11:53:22 1 17
While in the Primary Database, you can check what is the current sequence and what is the pending sequence to be applied.
On primary database
SQL> SELECT
(SELECT name FROM V$DATABASE
) name,
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 1
) Current_primary_seq,
(SELECT MAX (sequence#)
FROM v$archived_log
WHERE TRUNC(next_time) > SYSDATE - 1
AND dest_id = 2
) max_stby,
(SELECT NVL (
(SELECT MAX (sequence#) - MIN (sequence#)
FROM v$archived_log
WHERE TRUNC(next_time) > SYSDATE - 1
AND dest_id = 2
AND applied = 'NO'
), 0)
FROM DUAL
) "To be applied",
(
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 1
) -
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 2
)) "To be Shipped"
FROM DUAL;
NAME CURRENT_PRIMARY_SEQ MAX_STBY To be applied To be Shipped
--------- ------------------- ---------- ------------- -------------
PRIM 17 17 0 0
Finally Test on primary database to check if the datas are being replicated to standby or not
SQL> create user soumya identified by soumya;
SQL>grant connect , resource to soumya;
SQL> conn soumya/soumya
SQL>create table test (id number);
SQL>insert into test values(1);
SQL> /
SQL> /
SQL> commit;
Now on standby database:-
sqlplus soumya/soumya
SQL> select * from test;
ID
----------
1
1
So we can see the datas are applying on standby real time.
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OS Version:-Red Hat Enterprise Linux Server release 6.4
Oracle version:- Oracle Database 12c Enterprise Edition Release 11.2.0.1.0 64bit
Primary database:- prim
Standby database:- stand
System Configuration
primary server:-
edit the following files
vi /etc/hosts
192.168.2.102 server1.soumya.com server1
192.168.2.104 server2.soumya.com server2
:wq
vi /etc/sysconfig/network
HOSTNAME=server1.soumya.com
:wq
vi /etc/sysconfig/network-scripts/ifcfg-eth0
NETMASK=255.255.255.0
IPADDR=192.168.2.102
GATEWAY=192.168.2.1
:wq
Standby Server:-
edit the following files
vi /etc/hosts
192.168.2.102 server1.soumya.com server1
192.168.2.104 server2.soumya.com server2
:wq
vi /etc/sysconfig/network
HOSTNAME=server2.soumya.com
:wq
vi /etc/sysconfig/network-scripts/ifcfg-eth0
NETMASK=255.255.255.0
IPADDR=192.168.2.104
GATEWAY=192.168.2.1
:wq
In both server-- # service network restart
# service NetworkManager restart
# service iptables stop
# chkconfig iptables off
#vi /etc/selinux/config and disable selinux .
After changing inside the file please restart the server.
We have a database called prim on primary server and we will install only oracle binaries on
standby server(192.168.2.104).No database should be running in standby server.
Oracle Net configuration:-
Listener.ora configuration for primary database (prim) in primary server (192.168.2.102)
vi $ORACLE_HOME/network/admin/listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = prim)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = prim)
)
)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server1.soumya.com)(PORT = 1521))
)
ADR_BASE_LISTENER = /u01/app/oracle
:wq
Listener.ora configuration for standby database (stand) in standby server (192.168.2.104)
vi $ORACLE_HOME/network/admin/listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = stand)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = stand)
)
)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server2.soumya.com)(PORT = 1521))
)
ADR_BASE_LISTENER = /u01/app/oracle
:wq
On both server(192.168.2.102 & 192.168.2.104), add Oracle Net aliases for both databases and aux alias for RMAN DUPLICATE in
tnsnames.ora:
vi $ORACLE_HOME/network/admin/tnsnames.ora
prim =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server1.soumya.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = prim)
)
)
stand =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = server2.soumya.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = stand)
)
)
-save & exit(:wq )
Now we will have to start listener in primary and standby server:-
$ lsnrctl start
Check "tnsping prim" & "tnsping stand" in both server. If output of both command is
coming as "ok" that means oracle net service has been added successfully.
In primary database:-
Put the database in archivelog mode.
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 2
Current log sequence 4
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 629145600 bytes
Fixed Size 2927528 bytes
Variable Size 511706200 bytes
Database Buffers 109051904 bytes
Redo Buffers 5459968 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 2
Next log sequence to archive 4
Current log sequence 4
SQL> alter database open;
In Primary Database:-
Enable force logging The FORCE LOGGING option to ensure that all the changes made in the database
will be captured and available for recovery in the redo logs.
SQL> alter database force logging;
Database altered.
SQL> select force_logging from v$database;
FORCE_LOGGING
---------------------------------------
YES
Create a password file
$ orapwd file=$ORACLE_HOME/dbs/orapwprim password=redhat
$ cd $ORACLE_HOME/dbs/
$ chmod 775 orapwprim
$ cp orapwprim orapwstand
Now transfer the password file into standby server using scp command
$ scp orapwstand oracle@192.168.2.104:/u01/app/oracle/product/11.2.0/db_1/dbs/
Add following parameter in pfile for primary database.
create pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora' from spfile;
vi /u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora
*.db_name='prim'
*.db_unique_name='prim'
*.log_archive_config='DG_CONFIG=(prim, stand)'
*.log_archive_dest_1='LOCATION=/u01/app/oracle/flash_recovery_area VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=prim'
*.log_archive_dest_2='SERVICE=stand LGWR ASYNC VALID_FOR=(ALL_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stand'
*.log_archive_dest_state_1=enable
*.log_archive_dest_state_2=enable
*.FAL_SERVER=stand
*.FAL_CLIENT=prim
*.db_file_name_convert='/u01/app/oracle/oradata/stand/','/u01/app/oracle/oradata/prim/'
*.log_file_name_convert='/u01/app/oracle/oradata/stand/','/u01/app/oracle/oradata/prim/'
*.standby_file_management=auto
-save & exit(:wq)
SQL> shut immediate;
SQL> startup mount pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora';
SQL> create spfile from pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initprim.ora';
SQL> alter database open;
Total System Global Area 413372416 bytes
Fixed Size 2213896 bytes
Variable Size 339740664 bytes
Database Buffers 67108864 bytes
Redo Buffers 4308992 bytes
Database mounted.
Database opened.
At Standby database:-
Create the necessary directory structure:-
$ mkdir -p /u01/app/oracle/oradata/stand/
$ mkdir -p /u01/app/oracle/admin/stand/adump
$ mkdir -p /u01/app/oracle/flash_recovery_area/stand/
$ chmod 775 -Rf /u01
Configure .bash_profile
[oracle@server2 ~]$ vi .bash_profile
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH
export TMP=/tmp
export TMPDIR=$TMP
export ORACLE_HOSTNAME=server2.soumya.com
export ORACLE_UNQNAME=stand
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export ORACLE_SID=stand
export PATH=/usr/sbin:$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib:/usr/lib64
export CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib
Now start the instance in nomount mode with minimal options
vi initstand.ora
DB_NAME=prim
DB_UNIQUE_NAME=stand
DB_BLOCK_SIZE=8192
:wq
SQL> startup nomount pfile='/home/oracle/initstand.ora';
ORACLE instance started.
Total System Global Area 413372416 bytes
Fixed Size 2213896 bytes
Variable Size 339740664 bytes
Database Buffers 67108864 bytes
Redo Buffers 4308992 bytes
At primary database:-
Add the standby redologs.
SQL> select group#, members , bytes /1024 /1024 from v$log;
GROUP# MEMBERS BYTES/1024/1024
---------- ---------- ---------------
1 1 50
2 1 50
3 1 50
SQL> select group# , member from v$logfile;
GROUP# MEMBER
---------- --------------------------------------------------
3 /u01/app/oracle/oradata/prim/redo03.log
2 /u01/app/oracle/oradata/prim/redo02.log
1 /u01/app/oracle/oradata/prim/redo01.log
SQL> alter database add standby logfile group 4 '/u01/app/oracle/oradata/prim/redos4A.log' size 50M;
SQL> alter database add standby logfile group 5 '/u01/app/oracle/oradata/prim/redos5A.log' size 50M;
SQL> alter database add standby logfile group 6 '/u01/app/oracle/oradata/prim/redos6A.log' size 50M;
SQL> alter database add standby logfile group 7 '/u01/app/oracle/oradata/prim/redos7A.log' size 50M;
SQL> select group# , member from v$logfile;
GROUP# MEMBER
---------- --------------------------------------------------------------------------------
3 /u01/app/oracle/oradata/prim/redo03.log
2 /u01/app/oracle/oradata/prim/redo02.log
1 /u01/app/oracle/oradata/prim/redo01.log
4 /u01/app/oracle/oradata/prim/redos4A.log
5 /u01/app/oracle/oradata/prim/redos5A.log
6 /u01/app/oracle/oradata/prim/redos6A.log
7 /u01/app/oracle/oradata/prim/redos7A.log
At standby database:-
Now once the redoglogs have been created in primary database,we will create the following RMAN run commands and the changes to the standby’s spfile in this RMAN block.
[oracle@server2 ]rman target sys/redhat@prim auxiliary sys/redhat@stand
Recovery Manager: Release 11.2.0.1.0 - Production on Mon Sep 7 14:43:25 2015
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: PRIM (DBID=4130009889)
connected to auxiliary database: PRIM (not mounted)
RMAN>run {
allocate channel prmy1 type disk;
allocate channel prmy2 type disk;
allocate channel prmy3 type disk;
allocate channel prmy4 type disk;
allocate auxiliary channel stby type disk;
duplicate target database for standby from active database
spfile
parameter_value_convert 'prim','stand'
set db_unique_name='stand'
set db_file_name_convert='/u01/app/oracle/oradata/prim/','/u01/app/oracle/oradata/stand/'
set log_file_name_convert='/u01/app/oracle/oradata/prim/','/u01/app/oracle/oradata/stand/'
set control_files='/u01/app/oracle/oradata/stand/control01.ctl','/u01/app/oracle/oradata/stand/control02.ctl'
set log_archive_max_processes='10'
set fal_client='stand'
set fal_server='prim'
set standby_file_management='AUTO'
set log_archive_config='dg_config=(prim,stand)'
set log_archive_dest_2='service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'
;
}
using target database control file instead of recovery catalog
allocated channel: prmy1
channel prmy1: SID=32 device type=DISK
allocated channel: prmy2
channel prmy2: SID=33 device type=DISK
allocated channel: prmy3
channel prmy3: SID=34 device type=DISK
allocated channel: prmy4
channel prmy4: SID=35 device type=DISK
allocated channel: stby
channel stby: SID=19 device type=DISK
Starting Duplicate Db at 16-MAY-13
contents of Memory Script:
{
backup as copy reuse
targetfile '/u01/app/oracle/product/11.2.0/db_1/dbs/orapwprim' auxiliary format
'/u01/app/oracle/product/11.2.0/db_1/dbs/orapwstand' targetfile
'/u01/app/oracle/product/11.2.0/db_1/dbs/spfileprim.ora' auxiliary format
'/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora' ;
sql clone "alter system set spfile= ''/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora''";
}
executing Memory Script
Starting backup at 16-MAY-13
Finished backup at 16-MAY-13
sql statement: alter system set spfile= ''/u01/app/oracle/product/11.2.0/db_1/dbs/spfilestand.ora''
contents of Memory Script:
{
sql clone "alter system set audit_file_dest =
''/u01/app/oracle/oradata/dump/stand/adump'' comment=
'''' scope=spfile";
sql clone "alter system set diagnostic_dest =
''/u01/app/oracle/oradata/dump/stand'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_dest_1 =
''location=use_db_recovery_file_dest valid_for=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stand'' comment=
'''' scope=spfile";
sql clone "alter system set db_unique_name =
''stand'' comment=
'''' scope=spfile";
sql clone "alter system set db_file_name_convert =
''/u01/app/oracle/oradata/prim/prim/datafile/'', ''/u01/app/oracle/oradata/stand/stand/datafile/'' comment=
'''' scope=spfile";
sql clone "alter system set log_file_name_convert =
''/u01/app/oracle/oradata/prim/prim/onlinelog/'', ''/u01/app/oracle/oradata/stand/stand/onlinelog/'' comment=
'''' scope=spfile";
sql clone "alter system set control_files =
''/u01/app/oracle/oradata/stand/control/control01.ctl'', ''/u01/app/oracle/oradata/stand/control/control02.ctl'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_max_processes =
10 comment=
'''' scope=spfile";
sql clone "alter system set fal_client =
''stand'' comment=
'''' scope=spfile";
sql clone "alter system set fal_server =
''prim'' comment=
'''' scope=spfile";
sql clone "alter system set standby_file_management =
''AUTO'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_config =
''dg_config=(prim,stand)'' comment=
'''' scope=spfile";
sql clone "alter system set log_archive_dest_2 =
''service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'' comment=
'''' scope=spfile";
shutdown clone immediate;
startup clone nomount;
}
executing Memory Script
sql statement: alter system set audit_file_dest = ''/u01/app/oracle/oradata/dump/stand/adump'' comment= '''' scope=spfile
sql statement: alter system set diagnostic_dest = ''/u01/app/oracle/oradata/dump/stand'' comment= '''' scope=spfile
sql statement: alter system set log_archive_dest_1 = ''location=use_db_recovery_file_dest valid_for=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stand'' comment= '''' scope=spfile
sql statement: alter system set db_unique_name = ''stand'' comment= '''' scope=spfile
sql statement: alter system set db_file_name_convert = ''/u01/app/oracle/oradata/prim/prim/datafile/'', ''/u01/app/oracle/oradata/stand/stand/datafile/'' comment= '''' scope=spfile
sql statement: alter system set log_file_name_convert = ''/u01/app/oracle/oradata/prim/prim/onlinelog/'', ''/u01/app/oracle/oradata/stand/stand/onlinelog/'' comment= '''' scope=spfile
sql statement: alter system set control_files = ''/u01/app/oracle/oradata/stand/control/control01.ctl'', ''/u01/app/oracle/oradata/stand/control/control02.ctl'' comment= '''' scope=spfile
sql statement: alter system set log_archive_max_processes = 10 comment= '''' scope=spfile
sql statement: alter system set fal_client = ''stand'' comment= '''' scope=spfile
sql statement: alter system set fal_server = ''prim'' comment= '''' scope=spfile
sql statement: alter system set standby_file_management = ''AUTO'' comment= '''' scope=spfile
sql statement: alter system set log_archive_config = ''dg_config=(prim,stand)'' comment= '''' scope=spfile
sql statement: alter system set log_archive_dest_2 = ''service=prim ASYNC valid_for=(ONLINE_LOGFILE,PRIMARY_ROLE) db_unique_name=prim'' comment= '''' scope=spfile
Oracle instance shut down
connected to auxiliary database (not started)
Oracle instance started
Total System Global Area 534462464 bytes
Fixed Size 2230072 bytes
Variable Size 163580104 bytes
Database Buffers 364904448 bytes
Redo Buffers 3747840 bytes
allocated channel: stby
channel stby: SID=18 device type=DISK
contents of Memory Script:
{
backup as copy current controlfile for standby auxiliary format '/u01/app/oracle/oradata/stand/control/control01.ctl';
restore clone controlfile to '/u01/app/oracle/oradata/stand/control/control02.ctl' from
'/u01/app/oracle/oradata/stand/control/control01.ctl';
}
executing Memory Script
Starting backup at 16-MAY-13
channel prmy1: starting datafile copy
copying standby control file
output file name=/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_prim.f tag=TAG20130516T084319 RECID=7 STAMP=815561001
channel prmy1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 16-MAY-13
Starting restore at 16-MAY-13
channel stby: copied control file copy
Finished restore at 16-MAY-13
contents of Memory Script:
{
sql clone 'alter database mount standby database';
}
executing Memory Script
sql statement: alter database mount standby database
contents of Memory Script:
{
set newname for tempfile 1 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_temp_8qbok7fk_.tmp";
switch clone tempfile all;
set newname for datafile 1 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf";
set newname for datafile 2 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf";
set newname for datafile 3 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf";
set newname for datafile 4 to
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf";
backup as copy reuse
datafile 1 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf" datafile
2 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf" datafile
3 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf" datafile
4 auxiliary format
"/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf" ;
sql 'alter system archive log current';
}
executing Memory Script
executing command: SET NEWNAME
renamed tempfile 1 to /u01/app/oracle/oradata/stand/stand/datafile/o1_mf_temp_8qbok7fk_.tmp in control file
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting backup at 16-MAY-13
channel prmy1: starting datafile copy
input datafile file number=00001 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_system_8ocl7bho_.dbf
channel prmy2: starting datafile copy
input datafile file number=00002 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_sysaux_8ocl7k6n_.dbf
channel prmy3: starting datafile copy
input datafile file number=00003 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf
channel prmy4: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/prim/prim/datafile/o1_mf_users_8qbolh3g_.dbf
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf tag=TAG20130516T084335
channel prmy3: datafile copy complete, elapsed time: 00:00:45
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf tag=TAG20130516T084335
channel prmy4: datafile copy complete, elapsed time: 00:00:55
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf tag=TAG20130516T084335
channel prmy1: datafile copy complete, elapsed time: 00:01:05
output file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf tag=TAG20130516T084335
channel prmy2: datafile copy complete, elapsed time: 00:01:05
Finished backup at 16-MAY-13
sql statement: alter system archive log current
contents of Memory Script:
{
switch clone datafile all;
}
executing Memory Script
datafile 1 switched to datafile copy
input datafile copy RECID=7 STAMP=815561103 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_system_8ocl7bho_.dbf
datafile 2 switched to datafile copy
input datafile copy RECID=8 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sysaux_8ocl7k6n_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=9 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_sys_undo_8ocl7q6c_.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=10 STAMP=815561104 file name=/u01/app/oracle/oradata/stand/stand/datafile/o1_mf_users_8qbolh3g_.dbf
Finished Duplicate Db at 16-MAY-13
released channel: prmy1
released channel: prmy2
released channel: prmy3
released channel: prmy4
released channel: stby
RMAN> exit
Now at standby database:-
SQL>shut immediate;
SQL>startup mount
SQL>alter database recover managed standby database disconnect from session;
Now for real time apply:-
SQL> alter database recover managed standby database cancel;
SQL> alter database open;
SQL> alter database recover managed standby database using current logfile disconnect from session;
SQL>select open_mode from v$database; (Output : read only with apply)
There are various ways to see if this is working or not. You can use it in the following query to see what was the last archive received/applied in the Standby Database.
On standby database
SQL> SELECT 'Last Applied : ' Logs,
TO_CHAR(next_time,'DD-MON-YY:HH24:MI:SS') TIME,thread#,sequence#
FROM v$archived_log
WHERE sequence# =
(SELECT MAX(sequence#) FROM v$archived_log WHERE applied='YES'
)
UNION
SELECT 'Last Received : ' Logs,
TO_CHAR(next_time,'DD-MON-YY:HH24:MI:SS') TIME,thread#,sequence#
FROM v$archived_log
WHERE sequence# =
(SELECT MAX(sequence#) FROM v$archived_log );
LOGS TIME THREAD# SEQUENCE#
---------------- ------------------ ---------- ----------
Last Applied : 07-SEP-15:11:53:22 1 17
Last Received : 07-SEP-15:11:53:22 1 17
While in the Primary Database, you can check what is the current sequence and what is the pending sequence to be applied.
On primary database
SQL> SELECT
(SELECT name FROM V$DATABASE
) name,
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 1
) Current_primary_seq,
(SELECT MAX (sequence#)
FROM v$archived_log
WHERE TRUNC(next_time) > SYSDATE - 1
AND dest_id = 2
) max_stby,
(SELECT NVL (
(SELECT MAX (sequence#) - MIN (sequence#)
FROM v$archived_log
WHERE TRUNC(next_time) > SYSDATE - 1
AND dest_id = 2
AND applied = 'NO'
), 0)
FROM DUAL
) "To be applied",
(
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 1
) -
(SELECT MAX (sequence#) FROM v$archived_log WHERE dest_id = 2
)) "To be Shipped"
FROM DUAL;
NAME CURRENT_PRIMARY_SEQ MAX_STBY To be applied To be Shipped
--------- ------------------- ---------- ------------- -------------
PRIM 17 17 0 0
Finally Test on primary database to check if the datas are being replicated to standby or not
SQL> create user soumya identified by soumya;
SQL>grant connect , resource to soumya;
SQL> conn soumya/soumya
SQL>create table test (id number);
SQL>insert into test values(1);
SQL> /
SQL> /
SQL> commit;
Now on standby database:-
sqlplus soumya/soumya
SQL> select * from test;
ID
----------
1
1
So we can see the datas are applying on standby real time.
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