In this post we will see 12.2.0.1 Physical Standby Database creation using RMAN

Primary Server Details :

Hostname : Primary

IP Address : 172.168.190.15

DB Unique Name : INFRADBP_PRIME

 

Standby Server Details :

Hostname : Standby

IP Address : 172.168.190.20

DB Unique Name : INFRADBP_STBY

 

NOTE : Please enable archive logs, if not enabled
We are assuming here that archive log is enabled
Also, always keep another terminal opened to check the alert log for each database

 Please click on the INDEX and browse for more interesting posts.

To upgrade Physical standby database from 12c to 19c, clink on the below link

Upgrade your standby database

Steps in Primary database :

Force logging should be enabled

 

SQL> select name,open_mode from v$database;

NAME      OPEN_MODE
--------- --------------------
INFRADBP  READ WRITE

SQL> select force_logging from v$database;

FORCE_LOGGING
---------------------------------------
NO

SQL> ALTER DATABASE FORCE LOGGING;

Database altered.

SQL> select force_logging from v$database;

FORCE_LOGGING
---------------------------------------
YES

Add service name of standy in tnsnames.ora

INFRADBP_PRIME =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 172.168.190.15)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = infradbp)
    )
  )

LISTENER_INFRADBP =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 172.168.190.15)(PORT = 1521))


INFRADBP_STBY =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.168.190.20)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = infradbp)
    )
  )

Set archive log destinations and enable archive_log_dest_2

SQL> alter system set log_archive_dest_1='LOCATION=/u01/app/oracle/fast_recovery_area/infradbp';

System altered.

SQL> alter system set log_archive_dest_2='service=infradbp_stby async valid_for=(online_logfiles,primary_role) db_unique_name=infradbp_stby' scope=both;

System altered.

SQL> alter system set log_archive_dest_state_2=enable;

System altered.

Build the Environment File

export ORACLE_SID=infradbp
export ORACLE_HOME=/u01/app/oracle/product/19c
export ORACLE_BASE=/u01/app/oracle
export TNS_ADMIN=/u01/app/oracle/product/19c/network/admin
export PATH=$PATH:$ORACLE_HOME/bin

 

Make DB unique name to be part of dataguard

SQL> alter system set log_archive_config='dg_config=(infradbp_prime,infradbp_stby)' scope=both;

System altered.

 

Set remote login password to exclusive

SQL> alter system set remote_login_passwordfile=EXCLUSIVE scope=spfile;

System altered.

Set FAL Server and FAL client

SQL> alter system set fal_server='infradbp_stby' scope=both;

System altered.

SQL> alter system set fal_client='infradbp_prime' scope=both;

System altered.

 

Add standby logfiles to the primary server
The logs on the standby server need to be the same size and the count needs to be 1 more than online logfiles in order for the primary redo to be applied to the standby redo logs.

SQL> select member from v$logfile;

MEMBER
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/infradbp/redo03.log
/u01/app/oracle/oradata/infradbp/redo02.log
/u01/app/oracle/oradata/infradbp/redo01.log

SQL> !ls -ltrh /u01/app/oracle/oradata/infradbp/redo03.log
-rw-r-----. 1 oracle oinstall 201M Mar 28 11:58 /u01/app/oracle/oradata/infradbp/redo03.log


SQL> alter database add standby logfile '/u01/app/oracle/oradata/infradbp/standby_redo01.log' size 200M;

Database altered.

SQL> alter database add standby logfile '/u01/app/oracle/oradata/infradbp/standby_redo02.log' size 200M;

Database altered.

SQL> alter database add standby logfile '/u01/app/oracle/oradata/infradbp/standby_redo03.log' size 200M;

Database altered.

SQL> alter database add standby logfile '/u01/app/oracle/oradata/infradbp/standby_redo04.log' size 200M;

Database altered.

 

Backup using RMAN

rman target /

run{
 allocate channel ch1 type disk;
 allocate channel ch2 type disk;
 backup incremental level 0
 format '/u01/backup/al_%d_t%t_s%s_p%p'
 (database);
 release channel ch1;
 release channel ch2;
 allocate channel ch1 type disk;
 allocate channel ch2 type disk;
 crosscheck archivelog all;
 backup
 format '/u01/backup/al_arch_%d_t%t_s%s_p%p'
 filesperset=100
 (archivelog all);
 BACKUP CURRENT CONTROLFILE for standby format '/u01/backup/ct_%d_t%t_s%s_p%p';
 release channel ch1;
 release channel ch2;
}


RMAN> run{
 allocate channel ch1 type disk;
 allocate channel ch2 type disk;
 backup incremental level 0
 format '/u01/backup/al_%d_t%t_s%s_p%p'
 (database);
 release channel ch1;
 release channel ch2;
 allocate channel ch1 type disk;
 allocate channel ch2 type disk;
 crosscheck archivelog all;
 backup
 format '/u01/backup/al_arch_%d_t%t_s%s_p%p'
 filesperset=100
 (archivelog all);
 BACKUP CURRENT CONTROLFILE for standby format '/u01/backup/ct_%d_t%t_s%s_p%p';
 release channel ch1;
 release channel ch2;
}2> 3> 4> 5> 6> 7> 8> 9> 10> 11> 12> 13> 14> 15> 16> 17> 18> 19>

allocated channel: ch1
channel ch1: SID=266 device type=DISK

allocated channel: ch2
channel ch2: SID=267 device type=DISK

Starting backup at 28-MAR-21
channel ch1: starting incremental level 0 datafile backup set
channel ch1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/infradbp/system01.dbf
input datafile file number=00007 name=/u01/app/oracle/oradata/infradbp/users01.dbf
channel ch1: starting piece 1 at 28-MAR-21
channel ch2: starting incremental level 0 datafile backup set
channel ch2: specifying datafile(s) in backup set
input datafile file number=00003 name=/u01/app/oracle/oradata/infradbp/sysaux01.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/infradbp/undotbs01.dbf
channel ch2: starting piece 1 at 28-MAR-21
channel ch2: finished piece 1 at 28-MAR-21
piece handle=/u01/backup/al_INFRADBP_t1068379807_s4_p1 tag=TAG20210328T121007 comment=NONE
channel ch2: backup set complete, elapsed time: 00:00:35
channel ch1: finished piece 1 at 28-MAR-21
piece handle=/u01/backup/al_INFRADBP_t1068379807_s3_p1 tag=TAG20210328T121007 comment=NONE
channel ch1: backup set complete, elapsed time: 00:00:45
Finished backup at 28-MAR-21

Starting Control File and SPFILE Autobackup at 28-MAR-21
piece handle=/u01/app/oracle/fast_recovery_area/infradbp/INFRADBP/autobackup/2021_03_28/o1_mf_s_1068379852_j6097ntj_.bkp comment=NONE
Finished Control File and SPFILE Autobackup at 28-MAR-21

released channel: ch1

released channel: ch2

allocated channel: ch1
channel ch1: SID=266 device type=DISK

allocated channel: ch2
channel ch2: SID=267 device type=DISK

validation succeeded for archived log
archived log file name=/u01/app/oracle/fast_recovery_area/infradbp/INFRADBP/archivelog/2021_03_28/o1_mf_1_1_j6088p13_.arc RECID=1 STAMP=1068378862
validation succeeded for archived log
archived log file name=/u01/app/oracle/fast_recovery_area/infradbp/INFRADBP/archivelog/2021_03_28/o1_mf_1_2_j6088yyj_.arc RECID=2 STAMP=1068378871
Crosschecked 2 objects


Starting backup at 28-MAR-21
current log archived
channel ch1: starting archived log backup set
channel ch1: specifying archived log(s) in backup set
input archived log thread=1 sequence=1 RECID=1 STAMP=1068378862
channel ch1: starting piece 1 at 28-MAR-21
channel ch2: starting archived log backup set
channel ch2: specifying archived log(s) in backup set
input archived log thread=1 sequence=2 RECID=2 STAMP=1068378871
input archived log thread=1 sequence=3 RECID=3 STAMP=1068379855
channel ch2: starting piece 1 at 28-MAR-21
channel ch2: finished piece 1 at 28-MAR-21
piece handle=/u01/backup/al_arch_INFRADBP_t1068379855_s7_p1 tag=TAG20210328T121055 comment=NONE
channel ch2: backup set complete, elapsed time: 00:00:01
channel ch1: finished piece 1 at 28-MAR-21
piece handle=/u01/backup/al_arch_INFRADBP_t1068379855_s6_p1 tag=TAG20210328T121055 comment=NONE
channel ch1: backup set complete, elapsed time: 00:00:08
Finished backup at 28-MAR-21

Starting backup at 28-MAR-21
channel ch1: starting full datafile backup set
channel ch1: specifying datafile(s) in backup set
including standby control file in backup set
channel ch1: starting piece 1 at 28-MAR-21
channel ch1: finished piece 1 at 28-MAR-21
piece handle=/u01/backup/ct_INFRADBP_t1068379863_s8_p1 tag=TAG20210328T121103 comment=NONE
channel ch1: backup set complete, elapsed time: 00:00:01
Finished backup at 28-MAR-21

Starting Control File and SPFILE Autobackup at 28-MAR-21
piece handle=/u01/app/oracle/fast_recovery_area/infradbp/INFRADBP/autobackup/2021_03_28/o1_mf_s_1068379865_j60981rw_.bkp comment=NONE
Finished Control File and SPFILE Autobackup at 28-MAR-21

released channel: ch1

released channel: ch2

Change standby file management to auto 

SQL> show parameter standby

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
enabled_PDBs_on_standby              string      *
standby_archive_dest                 string      ?#/dbs/arch
standby_db_preserve_states           string      NONE
standby_file_management              string      MANUAL

SQL> alter system set standby_file_management=AUTO scope=BOTH;

System altered.

SQL> show parameter standby

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
enabled_PDBs_on_standby              string      *
standby_archive_dest                 string      ?#/dbs/arch
standby_db_preserve_states           string      NONE
standby_file_management              string      AUTO

Copy the pfile to standby server to make reflections as standby database

SQL> show parameter spfile

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
spfile                               string      /u01/app/oracle/product/12.2.0
                                                 /dbhome_1/dbs/spfileinfradbp.o
                                                 ra
SQL> create pfile from spfile;

File created.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
[oracle@primary backup]$ cd $ORACLE_HOME/dbs
[oracle@primary dbs]$ ls -ltr
total 10376
-rw-r-----. 1 oracle oinstall       24 Mar 28 11:34 lkINFRADBP
-rw-r-----. 1 oracle oinstall     3584 Mar 28 11:37 orapwinfradbp
-rw-rw----. 1 oracle oinstall     1544 Mar 28 11:40 hc_infradbp.dat
-rw-r-----. 1 oracle oinstall     4608 Mar 28 12:08 spfileinfradbp.ora
-rw-r-----. 1 oracle oinstall 10600448 Mar 28 12:11 snapcf_infradbp.f
-rw-r--r--. 1 oracle oinstall     1554 Mar 28 12:58 initinfradbp.ora

[oracle@primary dbs]$ sftp 172.168.190.20
oracle@172.168.190.20's password:
Connected to 172.168.190.20.
sftp> cd /u01/app/oracle/product/12.2.0/dbhome_1/dbs
sftp> put initinfradbp.ora
Uploading initinfradbp.ora to /u01/app/oracle/product/12.2.0/dbhome_1/dbs/initinfradbp.ora
initinfradbp.ora                                                                                                                                           100% 1554     1.5KB/s   00:00

 

Copy the backup,standby controlfile, tnsnames, sqlnet, listener and password file to standby server

[oracle@primary dbs]$ sftp 172.168.190.20
oracle@172.168.190.20's password:
Connected to 172.168.190.20.

sftp> cd /u01/app/oracle/product/12.2.0/dbhome_1/dbs

sftp> put orapwinfradbp
Uploading orapwinfradbp to /u01/app/oracle/product/12.2.0/dbhome_1/dbs/orapwinfradbp
orapwinfradbp                                                                                                                                              100% 3584     3.5KB/s   00:00

sftp> cd /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/

sftp> put sqlnet.ora
Uploading sqlnet.ora to /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/sqlnet.ora
sqlnet.ora                                                                                                                                                 100%  202     0.2KB/s   00:00

sftp> put tnsnames.ora
Uploading tnsnames.ora to /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/tnsnames.ora
tnsnames.ora                                                                                                                                               100%  614     0.6KB/s   00:00

sftp> put listener.ora
Uploading listener.ora to /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/listener.ora
listener.ora                                                                                                                                               100%  492     0.5KB/s   00:00

[oracle@primary admin]$ cd /u01/backup/
[oracle@primary backup]$ ls -ltr
total 1211784
-rw-r-----. 1 oracle oinstall 359989248 Mar 28 12:10 al_INFRADBP_t1068379807_s4_p1
-rw-r-----. 1 oracle oinstall 710975488 Mar 28 12:10 al_INFRADBP_t1068379807_s3_p1
-rw-r-----. 1 oracle oinstall    804864 Mar 28 12:10 al_arch_INFRADBP_t1068379855_s7_p1
-rw-r-----. 1 oracle oinstall 158426624 Mar 28 12:10 al_arch_INFRADBP_t1068379855_s6_p1
-rw-r-----. 1 oracle oinstall  10665984 Mar 28 12:11 ct_INFRADBP_t1068379863_s8_p1
[oracle@primary backup]$ sftp 172.168.190.20
oracle@172.168.190.20's password:
Connected to 172.168.190.20.
sftp> cd /u01/backup/
sftp> put *
Uploading al_INFRADBP_t1068379807_s3_p1 to /u01/backup/al_INFRADBP_t1068379807_s3_p1
al_INFRADBP_t1068379807_s3_p1                                                                                                                              100%  678MB  52.2MB/s   00:13
Uploading al_INFRADBP_t1068379807_s4_p1 to /u01/backup/al_INFRADBP_t1068379807_s4_p1
al_INFRADBP_t1068379807_s4_p1                                                                                                                              100%  343MB  17.2MB/s   00:20
Uploading al_arch_INFRADBP_t1068379855_s6_p1 to /u01/backup/al_arch_INFRADBP_t1068379855_s6_p1
al_arch_INFRADBP_t1068379855_s6_p1                                                                                                                         100%  151MB  75.5MB/s   00:02
Uploading al_arch_INFRADBP_t1068379855_s7_p1 to /u01/backup/al_arch_INFRADBP_t1068379855_s7_p1
al_arch_INFRADBP_t1068379855_s7_p1                                                                                                                         100%  786KB 786.0KB/s   00:00
Uploading ct_INFRADBP_t1068379863_s8_p1 to /u01/backup/ct_INFRADBP_t1068379863_s8_p1
ct_INFRADBP_t1068379863_s8_p1                                                                                                                              100%   10MB  10.2MB/s   00:01

 

Steps in Standby Database :

Build the directories in the standby :

[oracle@standby dbs]$ mkdir -p /u01/app/oracle/admin/infradbp/adump
[oracle@standby dbs]$ mkdir -p /u01/app/oracle/oradata/infradbp/
[oracle@standby dbs]$ mkdir -p /u01/app/oracle/fast_recovery_area/infradbp

 

Make changes in the listener host to point to standby host

[oracle@standby admin]$ cat listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/12.2.0/dbhome_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.168.190.20)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (ORACLE_HOME = /u01/app/oracle/product/12.2.0/dbhome_1)
      (SID_NAME = infradbp)
    )
  )

Make below changes in the pfile

*.audit_file_dest='/u01/app/oracle/admin/infradbp/adump'
*.db_name='infradbp'
*.db_unique_name='infradbp_stby'
*.fal_client='infradbp_stby'
*.fal_server='infradbp_prime'
*.log_archive_dest_1='location=use_db_recovery_file_dest valid_for=(all_logfiles,all_roles) db_unique_name=infradbp_stby'
*.log_file_name_convert='dummy','dummy'  --> Add this if the paths are identical to standby, or else mention the paths. This is required to avoid the error--ORA-19527: physical standby redo log must be renamed
*.remote_login_passwordfile='EXCLUSIVE'
*.standby_file_management='AUTO'

 

Start the database using the modified pfile

[oracle@standby dbs]$ ls -ltr
total 8
-rw-r-----. 1 oracle oinstall 3584 Mar 28 13:00 orapwinfradbp
-rw-r--r--. 1 oracle oinstall 1503 Mar 28 13:05 initinfradbp.ora
[oracle@standby dbs]$ pwd
/u01/app/oracle/product/12.2.0/dbhome_1/dbs

[oracle@standby dbs]$ sqlplus '/as sysdba'

SQL*Plus: Release 12.2.0.1.0 Production on Sun Mar 28 13:14:37 2021

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup nomount pfile='/u01/app/oracle/product/12.2.0/dbhome_1/dbs/initinfradbp.ora';
ORACLE instance started.

Total System Global Area 1795162112 bytes
Fixed Size                  8621760 bytes
Variable Size             553648448 bytes
Database Buffers         1224736768 bytes
Redo Buffers                8155136 bytes

 

Restore the standby control file

[oracle@standby backup]$ ls -ltr
total 1211784
-rw-r-----. 1 oracle oinstall 710975488 Mar 28 13:08 al_INFRADBP_t1068379807_s3_p1
-rw-r-----. 1 oracle oinstall 359989248 Mar 28 13:08 al_INFRADBP_t1068379807_s4_p1
-rw-r-----. 1 oracle oinstall 158426624 Mar 28 13:08 al_arch_INFRADBP_t1068379855_s6_p1
-rw-r-----. 1 oracle oinstall    804864 Mar 28 13:08 al_arch_INFRADBP_t1068379855_s7_p1
-rw-r-----. 1 oracle oinstall  10665984 Mar 28 13:08 ct_INFRADBP_t1068379863_s8_p1
[oracle@standby backup]$ pwd
/u01/backup
[oracle@standby backup]$ rman target /

Recovery Manager: Release 12.2.0.1.0 - Production on Sun Mar 28 13:15:25 2021

Copyright (c) 1982, 2017, Oracle and/or its affiliates.  All rights reserved.

connected to target database: INFRADBP (not mounted)

RMAN> restore standby controlfile from '/u01/backup/ct_INFRADBP_t1068379863_s8_p1';

Starting restore at 28-MAR-21
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=35 device type=DISK

channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/u01/app/oracle/oradata/infradbp/control01.ctl
output file name=/u01/app/oracle/fast_recovery_area/infradbp/control02.ctl
Finished restore at 28-MAR-21

 

Mount the database

RMAN> alter database mount;

Statement processed
released channel: ORA_DISK_1

 

Restore the database from the primary’s backup

RMAN> restore database;

Starting restore at 28-MAR-21
Starting implicit crosscheck backup at 28-MAR-21
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=35 device type=DISK
Crosschecked 5 objects
Finished implicit crosscheck backup at 28-MAR-21

Starting implicit crosscheck copy at 28-MAR-21
using channel ORA_DISK_1
Finished implicit crosscheck copy at 28-MAR-21

searching for all files in the recovery area
cataloging files...
no files cataloged

using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/infradbp/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/infradbp/undotbs01.dbf
channel ORA_DISK_1: reading from backup piece /u01/backup/al_INFRADBP_t1068379807_s4_p1
channel ORA_DISK_1: piece handle=/u01/backup/al_INFRADBP_t1068379807_s4_p1 tag=TAG20210328T121007
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:15
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/infradbp/system01.dbf
channel ORA_DISK_1: restoring datafile 00007 to /u01/app/oracle/oradata/infradbp/users01.dbf
channel ORA_DISK_1: reading from backup piece /u01/backup/al_INFRADBP_t1068379807_s3_p1
channel ORA_DISK_1: piece handle=/u01/backup/al_INFRADBP_t1068379807_s3_p1 tag=TAG20210328T121007
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:35
Finished restore at 28-MAR-21

 

Start listener

lsnrctl start listener

 

Start redo apply on standby

SQL> alter database recover managed standby database disconnect from session;
Database altered.

 

Check the log gaps and applied logs

SQL> select process,sequence#,status from v$managed_standby;

PROCESS    SEQUENCE# STATUS
--------- ---------- ------------
ARCH               9 CLOSING
DGRD               0 ALLOCATED
DGRD               0 ALLOCATED
ARCH               7 CLOSING
ARCH              10 CLOSING
ARCH               0 CONNECTED
RFS               11 IDLE
RFS                0 IDLE
RFS                0 IDLE
RFS                0 IDLE
RFS                0 IDLE

PROCESS    SEQUENCE# STATUS
--------- ---------- ------------
MRP0              11 APPLYING_LOG


SELECT A.THREAD#,
 B.LAST_SEQ,
 A.APPLIED_SEQ,
 to_char(A.LAST_APP_TIMESTAMP ,'DD-MON-YYYY HH24:MI:SS') "Applied Time",
 B.LAST_SEQ - A.APPLIED_SEQ ARC_DIFF
 FROM ( SELECT THREAD#,
 MAX (SEQUENCE#) APPLIED_SEQ,
 MAX (NEXT_TIME) LAST_APP_TIMESTAMP
 FROM GV$ARCHIVED_LOG
 WHERE APPLIED = 'YES'
 GROUP BY THREAD#) A,
 ( SELECT THREAD#, MAX (SEQUENCE#) LAST_SEQ
 FROM GV$ARCHIVED_LOG
 GROUP BY THREAD#) B
 WHERE A.THREAD# = B.THREAD#;


SQL> SELECT A.THREAD#,
 B.LAST_SEQ,
 A.APPLIED_SEQ,
 to_char(A.LAST_APP_TIMESTAMP ,'DD-MON-YYYY HH24:MI:SS') "Applied Time",
 B.LAST_SEQ - A.APPLIED_SEQ ARC_DIFF
 FROM ( SELECT THREAD#,
 MAX (SEQUENCE#) APPLIED_SEQ,
 MAX (NEXT_TIME) LAST_APP_TIMESTAMP
 FROM GV$ARCHIVED_LOG
 WHERE APPLIED = 'YES'
 GROUP BY THREAD#) A,
 ( SELECT THREAD#, MAX (SEQUENCE#) LAST_SEQ
 FROM GV$ARCHIVED_LOG
 GROUP BY THREAD#) B
 WHERE A.THREAD# = B.THREAD#;  2    3    4    5    6    7    8    9   10   11   12   13   14   15

   THREAD#   LAST_SEQ APPLIED_SEQ Applied Time                    ARC_DIFF
---------- ---------- ----------- ----------------------------- ----------
         1         10          10 28-MAR-2021 16:15:12                   0


 

Switch logfile in primary and check whether it is transported and applied in standby or not