ORACLE DATA GUARD 19C STANDBY CONFIGURATION
DATA GUARD
Oracle Data Guard ensures high availability, data protection, and
disaster recovery for enterprise data. Data Guard provides a comprehensive set
of services that create, maintain, manage, and monitor one or more standby
databases to enable production Oracle databases to survive disasters and data
corruptions. Data Guard maintains these standby databases as transactional
consistent copies of the production database. Then, if the production database
becomes unavailable because of a planned or an unplanned outage, Data Guard can
switch any standby database to the production role, minimizing the downtime
associated with the outage. Data Guard can be used with traditional backup,
restoration, and cluster techniques to provide a high level of data protection
and data availability.
ENVIRONMENT
DETAILS:
|
Environment |
Primary |
Standby |
|
dbname |
vignesh |
data |
|
serverip |
192.168.229.132 |
192.168.229.133 |
Primary server configuration:
Step 1: Check Archive log mode enable and force logging
method
In primary database check weather
the archive log mode is enable or not also check force logging option enable if
is not enable please enable it:
[oracle@vignesh
~]$ export ORACLE_SID=vignesh
[oracle@vignesh
~]$ sqlplus / as sysdba
SQL*Plus:
Release 19.0.0.0.0 - Production on Thu Nov 18 07:06:06 2021
Version
19.3.0.0.0
Copyright
(c) 1982, 2019, Oracle. All rights
reserved.
Connected
to:
Oracle
Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version
19.3.0.0.0
Connect database as
mount stage
SQL>
alter database archivelog;
Database
altered.
SQL>
alter database force logging;
Database
altered.
SQL>
alter database open;
Database
altered.
SQL>
select FORCE_LOGGING,log_mode from v$database;
FORCE_LOGGING LOG_MODE
---------------------------------------
------------
YES ARCHIVELOG
Step 2: Add logfile group
Add log file group in primary
database mentioned as that file creation as standby log group
SQL>
alter database add standby logfile group 4 '/u01/app/oracle/oradata/VIGNESH/redo04.log'
size 50m;
Database
altered.
SQL>
alter database add standby logfile group 5 '/u01/app/oracle/oradata/VIGNESH/redo05.log'
size 50m;
Database
altered.
SQL>
alter database add standby logfile group 6 '/u01/app/oracle/oradata/VIGNESH/redo06.log'
size 50m;
Database
altered.
SQL>
SELECT GROUP#,THREAD#,SEQUENCE#,ARCHIVED,STATUS FROM V$STANDBY_LOG;
GROUP#
THREAD# SEQUENCE# ARC STATUS
----------
---------- ---------- --- ----------
4 0 0 YES UNASSIGNED
5 0 0 YES UNASSIGNED
6 0 0 YES UNASSIGNED
SQL>
Step 3- check listener and TNS entry both primary and
standby severs
Primary side entries
listener
=
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.132)(PORT = 1521))
)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY =
EXTPROC))
)
)
)
SID_LIST_LISTENER
=
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME =
/u01/app/oracle/product/19.0.0/dbhome_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = vignesh)
(ORACLE_HOME =/u01/app/oracle/product/19.0.0/dbhome_1)
(SID_NAME = vignesh)
)
)
[oracle@vignesh
admin]$
[oracle@vignesh
admin]$ cat tnsnames.ora
vignesh=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.132)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = vignesh)
)
)
data=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.133)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = data)
(UR=A)
)
)
Standby side entries
[oracle@data
admin]$ cat listener.ora
listener
=
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.133)(PORT = 1521))
)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY =
EXTPROC))
)
)
)
SID_LIST_LISTENER
=
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME =
/u01/app/oracle/product/19.0.0/dbhome_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = data)
(ORACLE_HOME
=/u01/app/oracle/product/19.0.0/dbhome_1)
(SID_NAME = data)
)
)
[oracle@data
admin]$
data=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.133)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = data)
)
)
vignesh=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.132)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = vignesh)
(UR=A)
)
)
Output of tns ping
statements connect both of sides primary to standby and standby to primary
[oracle@vignesh
admin]$ tnsping data
TNS
Ping Utility for Linux: Version 19.0.0.0.0 - Production on 18-NOV-2021 07:19:44
Copyright
(c) 1997, 2019, Oracle. All rights
reserved.
Used
parameter files:
Used
TNSNAMES adapter to resolve the alias
Attempting
to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.133)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = data) (UR=A)))
OK
(20 msec)
[oracle@vignesh
admin]$ tnsping vignesh
TNS
Ping Utility for Linux: Version 19.0.0.0.0 - Production on 18-NOV-2021 07:19:55
Copyright
(c) 1997, 2019, Oracle. All rights
reserved.
Used
parameter files:
Used
TNSNAMES adapter to resolve the alias
Attempting
to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST =
192.168.229.132)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = vignesh)))
OK
(0 msec)
[oracle@vignesh
admin]$
Step 4:Changing some of the parameters in primary
database it’s the basic configuration parameters in dataguard
1. dg_config –
Specify the DG_CONFIG attribute to identify the DB_UNIQUE_NAME for the primary
database and each standby database in the Data Guard configuration.
SQL>
ALTER SYSTEM SET log_archive_config='dg_config=(vignesh,data)' SCOPE=both;
System
altered.
2. log_archive_dest_1 - The LOG_ARCHIVE_DEST parameter is used to specify the directory to which Oracle
archive logs are written.
SQL>
ALTER SYSTEM SET log_archive_dest_1='location=use_db_recovery_file_dest
valid_for=(all_logfiles,all_roles) db_unique_name=vignesh' SCOPE=both;
System
altered.
3. log_archive_dest_2
- handle the transmission of the standby
site’s archived redo logs back to the original primary database
SQL>
ALTER SYSTEM SET log_archive_dest_2='service=data async
valid_for=(online_logfiles,primary_role) db_unique_name=data' SCOPE=both;
System
altered.
4. FAL_SERVER Parameter
FAL means fetch archive log. Its
clearly indicate with name that fetch the archive log.
FAL_SERVER used to fetch archive log server for a
standby database.
Value in FAL_SERVER parameter act as Oracle Net
Service name which point to standby database.
SQL>
ALTER SYSTEM SET fal_server='data' SCOPE=both;
System
altered.
5. FAL_CLIENTParameter
FAL_CLIENT specifies the FAL(fetch archive log)
client name that is used by the FAL service.
It configured for point the FAL Client.
Value in FAL_CLIENT is also an Oracle Net Service
Name.
SQL>
ALTER SYSTEM SET fal_client='vignesh' SCOPE=both;
System
altered.
6. standby_file_management
-
Check the redo changes done in Primary and sync that changes
in Standby by Stopping the recovery and make STANDBY_FILE_MANAGEMENT = MANUAL
value. Then sync the primary changes with standby changes and again change
parameter to AUTO and start the recovery on Standby database.
SQL>
ALTER SYSTEM SET standby_file_management='AUTO' SCOPE=both;
System
altered.
SQL> show parameter log_archive_config;
NAME TYPE
VALUE
------------------------------------
----------- ------------------------------
log_archive_config string
dg_config=(vignesh,data)
SQL>
Step 5: - copy password files (primary)
scp
orapwvignesh oracle@192.168.229.133:$ORACLE_HOME/dbs
[oracle@vignesh
dbs]$ scp orapwvignesh oracle@192.168.229.133:$ORACLE_HOME/dbs
oracle@192.168.229.133's
password:
orapwvignesh 100% 2048 2.1MB/s
00:00
[oracle@vignesh
dbs]$
Move the file in new name
(standby)
oracle@data
~]$ cd $ORACLE_HOME/dbs
[oracle@data
dbs]$ ls
hc_data.dat init.ora
lkDATA orapwdata orapwvignesh
spfiledata.ora
[oracle@data
dbs]$ mv orapwvignesh orapwdata
Step 6 :- Changing parameters in standby database
In the $ORACLE_HOME/dbs directory
of the standby system, create an initialization parameter file named initdata.ora
Containing a single parameter: DB_NAME=vignesh
[oracle@data dbs]$ cat initdata.ora
db_name=vignesh
[oracle@data dbs]$ pwd
/u01/app/oracle/product/19.0.0/dbhome_1/dbs
Step 7 :- Create directory Structure in Standby
database
[oracle@data
dbs]$ cd $ORACLE_BASE/admin/
[oracle@data
dbs]$ mkdir data
[oracle@data
dbs]$ cd data
[oracle@data
dbs]$ mkdir adump
[oracle@data
dbs]$ mkdir -p /u01/app/oracle/oradata/DATA
Step 8:- connect RMAN and in standby database and run
the script
Target database as primary – Vignesh
Auxiliary database as standby - Data
[oracle@data
admin]$ export ORACLE_SID=vignesh
[oracle@data
admin]$ rman target sys/oracle@vignesh auxiliary sys/oracle@data
Recovery
Manager: Release 19.0.0.0.0 - Production on Thu Nov 18 08:00:22 2021
Version
19.3.0.0.0
Copyright
(c) 1982, 2019, Oracle and/or its affiliates.
All rights reserved.
connected
to target database: VIGNESH (DBID=396457310)
connected
to auxiliary database: VIGNESH (not mounted)
|
RMAN>
run { allocate
channel p1 type disk; allocate
channel p2 type disk; allocate
channel p3 type disk; allocate
channel p4 type disk; allocate
auxiliary channel s1 type disk; duplicate
target database for standby from active database spfile parameter_value_convert
'vignesh','data' set
db_name='vignesh' set
db_unique_name='data' set
db_file_name_convert='/u01/app/oracle/oradata/VIGNESH/','/u01/app/oracle/oradata/DATA/' set
log_file_name_convert='/u01/app/oracle/oradata/VIGNESH/','/u01/app/oracle/oradata/DATA/' set
control_files='/u01/app/oracle/oradata/DATA/standby1.ctl' set
log_archive_max_processes='5' set
fal_client='data' set
fal_server='vignesh' set
standby_file_management='AUTO' set
log_archive_config='dg_config=(vignesh,data)' set
compatible='19.3.0.0' set
memory_target='1200m' nofilenamecheck; } |
using
target database control file instead of recovery catalog
allocated
channel: p1
channel
p1: SID=82 device type=DISK
allocated
channel: p2
channel
p2: SID=81 device type=DISK
allocated
channel: p3
channel
p3: SID=85 device type=DISK
allocated
channel: p4
channel
p4: SID=86 device type=DISK
allocated
channel: s1
channel
s1: SID=35 device type=DISK
Starting
Duplicate Db at 18-NOV-21
contents
of Memory Script:
{
backup as copy reuse
passwordfile auxiliary format
'/u01/app/oracle/product/19.0.0/dbhome_1/dbs/orapwdata' targetfile
'/u01/app/oracle/product/19.0.0/dbhome_1/dbs/spfilevignesh.ora'
auxiliary format
'/u01/app/oracle/product/19.0.0/dbhome_1/dbs/spfiledata.ora' ;
sql clone "alter system set spfile=
''/u01/app/oracle/product/19.0.0/dbhome_1/dbs/spfiledata.ora''";
}
executing
Memory Script
Starting
backup at 18-NOV-21
Finished
backup at 18-NOV-21
sql
statement: alter system set spfile=
''/u01/app/oracle/product/19.0.0/dbhome_1/dbs/spfiledata.ora''
contents
of Memory Script:
{
sql clone "alter system set audit_file_dest =
''/u01/app/oracle/admin/data/adump'' comment=
'''' scope=spfile";
sql clone "alter system set dispatchers =
''(PROTOCOL=TCP) (SERVICE=dataXDB)'' comment=
'''' scope=spfile";
sql clone "alter system set db_name =
''vignesh'' comment=
'''' scope=spfile";
sql clone "alter system set db_unique_name =
''data'' comment=
'''' scope=spfile";
sql clone "alter system set db_file_name_convert =
''/u01/app/oracle/oradata/VIGNESH/'',
''/u01/app/oracle/oradata/DATA/'' comment=
'''' scope=spfile";
sql clone "alter system set log_file_name_convert =
''/u01/app/oracle/oradata/VIGNESH/'',
''/u01/app/oracle/oradata/DATA/'' comment=
'''' scope=spfile";
sql clone "alter system set control_files =
''/u01/app/oracle/oradata/DATA/standby1.ctl''
comment=
'''' scope=spfile";
sql clone "alter system set log_archive_max_processes =
5 comment=
'''' scope=spfile";
sql clone "alter system set fal_client =
''data'' comment=
'''' scope=spfile";
sql clone "alter system set fal_server =
''vignesh'' 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=(vignesh,data)'' comment=
'''' scope=spfile";
sql clone "alter system set compatible =
''19.3.0.0'' comment=
'''' scope=spfile";
sql clone "alter system set memory_target =
1200m comment=
'''' scope=spfile";
shutdown clone immediate;
startup clone nomount;
}
executing
Memory Script
sql
statement: alter system set
audit_file_dest =
''/u01/app/oracle/admin/data/adump'' comment= '''' scope=spfile
sql
statement: alter system set dispatchers
= ''(PROTOCOL=TCP) (SERVICE=dataXDB)''
comment= '''' scope=spfile
sql
statement: alter system set db_name
= ''vignesh'' comment= '''' scope=spfile
sql
statement: alter system set
db_unique_name = ''data''
comment= '''' scope=spfile
sql
statement: alter system set
db_file_name_convert =
''/u01/app/oracle/oradata/VIGNESH/'', ''/u01/app/oracle/oradata/DATA/''
comment= '''' scope=spfile
sql
statement: alter system set
log_file_name_convert =
''/u01/app/oracle/oradata/VIGNESH/'', ''/u01/app/oracle/oradata/DATA/''
comment= '''' scope=spfile
sql
statement: alter system set
control_files = ''/u01/app/oracle/oradata/DATA/standby1.ctl''
comment= '''' scope=spfile
sql
statement: alter system set
log_archive_max_processes = 5
comment= '''' scope=spfile
sql
statement: alter system set fal_client
= ''data'' comment= '''' scope=spfile
sql
statement: alter system set fal_server
= ''vignesh'' 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=(vignesh,data)'' comment= '''' scope=spfile
sql
statement: alter system set compatible
= ''19.3.0.0'' comment= ''''
scope=spfile
sql
statement: alter system set
memory_target = 1200m comment=
'''' scope=spfile
Oracle
instance shut down
connected
to auxiliary database (not started)
Oracle
instance started
Total
System Global Area 1258290752 bytes
Fixed
Size 8896064 bytes
Variable
Size 738197504 bytes
Database
Buffers 503316480 bytes
Redo
Buffers 7880704 bytes
allocated
channel: s1
channel
s1: SID=35 device type=DISK
contents
of Memory Script:
{
backup as copy current controlfile for
standby auxiliary format
'/u01/app/oracle/oradata/DATA/standby1.ctl';
}
executing
Memory Script
Starting
backup at 18-NOV-21
channel
p1: starting datafile copy
copying
standby control file
output
file name=/u01/app/oracle/product/19.0.0/dbhome_1/dbs/snapcf_vignesh.f
tag=TAG20211118T080552
channel
p1: datafile copy complete, elapsed time: 00:00:01
Finished
backup at 18-NOV-21
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/DATA/datafile/o1_mf_temp_jsc8y37j_.tmp";
switch clone tempfile all;
set newname for datafile 1 to
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_system_jsc8qv1o_.dbf";
set newname for datafile 3 to
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_sysaux_jsc8smrq_.dbf";
set newname for datafile 4 to
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_undotbs1_jsc8tq0b_.dbf";
set newname for datafile 7 to
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_users_jsc8tr78_.dbf";
backup as copy reuse
datafile
1 auxiliary format
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_system_jsc8qv1o_.dbf" datafile
3 auxiliary format
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_sysaux_jsc8smrq_.dbf" datafile
4 auxiliary format
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_undotbs1_jsc8tq0b_.dbf" datafile
7 auxiliary format
"/u01/app/oracle/oradata/DATA/datafile/o1_mf_users_jsc8tr78_.dbf" ;
sql 'alter system archive log current';
}
executing
Memory Script
executing
command: SET NEWNAME
renamed
tempfile 1 to /u01/app/oracle/oradata/DATA/datafile/o1_mf_temp_jsc8y37j_.tmp in
control file
executing
command: SET NEWNAME
executing
command: SET NEWNAME
executing
command: SET NEWNAME
executing
command: SET NEWNAME
Starting
backup at 18-NOV-21
channel
p1: starting datafile copy
input
datafile file number=00001
name=/u01/app/oracle/oradata/VIGNESH/datafile/o1_mf_system_jsc8qv1o_.dbf
channel
p2: starting datafile copy
input
datafile file number=00003
name=/u01/app/oracle/oradata/VIGNESH/datafile/o1_mf_sysaux_jsc8smrq_.dbf
channel
p3: starting datafile copy
input
datafile file number=00004
name=/u01/app/oracle/oradata/VIGNESH/datafile/o1_mf_undotbs1_jsc8tq0b_.dbf
channel
p4: starting datafile copy
input
datafile file number=00007
name=/u01/app/oracle/oradata/VIGNESH/datafile/o1_mf_users_jsc8tr78_.dbf
output
file name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_users_jsc8tr78_.dbf
tag=TAG20211118T080558
channel
p4: datafile copy complete, elapsed time: 00:00:08
output
file name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_sysaux_jsc8smrq_.dbf
tag=TAG20211118T080558
channel
p2: datafile copy complete, elapsed time: 00:01:00
output
file name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_undotbs1_jsc8tq0b_.dbf
tag=TAG20211118T080558
channel
p3: datafile copy complete, elapsed time: 00:00:59
output
file name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_system_jsc8qv1o_.dbf
tag=TAG20211118T080558
channel
p1: datafile copy complete, elapsed time: 00:01:22
Finished
backup at 18-NOV-21
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=1 STAMP=1088928441 file
name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_system_jsc8qv1o_.dbf
datafile
3 switched to datafile copy
input
datafile copy RECID=2 STAMP=1088928441 file
name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_sysaux_jsc8smrq_.dbf
datafile
4 switched to datafile copy
input
datafile copy RECID=3 STAMP=1088928441 file
name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_undotbs1_jsc8tq0b_.dbf
datafile
7 switched to datafile copy
input
datafile copy RECID=4 STAMP=1088928441 file
name=/u01/app/oracle/oradata/DATA/datafile/o1_mf_users_jsc8tr78_.dbf
Finished
Duplicate Db at 18-NOV-21
released
channel: p1
released
channel: p2
released
channel: p3
released
channel: p4
released
channel: s1
RMAN>
exit
Step 9: Check database can be configured or not:
SQL>
select open_mode,name from v$database;
OPEN_MODE
NAME
--------------------
---------
MOUNTED
VIGNESH
SQL>
select open_mode,name,database_role from v$database;
OPEN_MODE
NAME DATABASE_ROLE
--------------------
--------- ----------------
MOUNTED
VIGNESH
PHYSICAL STANDBY
Step 10:- connect standby database execute the command
SQL>
alter database recover managed standby database disconnect nodelay;
Database
altered.
Step 11:- in primary database switch log files:
SQL>
archive log list;
Database
log mode Archive Mode
Automatic
archival Enabled
Archive
destination USE_DB_RECOVERY_FILE_DEST
Oldest
online log sequence 7
Next
log sequence to archive 9
Current
log sequence 9
Set
log_archive_dest_state_2 as defer
SQL>
alter system set log_archive_dest_state_2=defer;
System
altered.
Enable log_archive_dest_state_2
location
SQL>
alter system set log_archive_dest_state_2=enable;
System
altered.
SQL>
alter system switch logfile;
System
altered.
SQL>
/
System
altered.
Step 12 : – check standby database log files can be
swithed
SQL>
select error, status from v$archive_dest;
SQL>
SELECT ARCH.THREAD# "Thread", ARCH.SEQUENCE# "Last Sequence
Received", APPL.SEQUENCE# "Last Sequence Applied",
(ARCH.SEQUENCE# - APPL.SEQUENCE#) "Difference"
FROM
(SELECT
THREAD# ,SEQUENCE# FROM V$ARCHIVED_LOG WHERE (THREAD#,FIRST_TIME ) IN (SELECT
THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG GROUP BY THREAD#)) ARCH,
(SELECT
THREAD# ,SEQUENCE# FROM V$LOG_HISTORY WHERE (THREAD#,FIRST_TIME ) IN (SELECT
THREAD#,MAX(FIRST_TIME) FROM V$LOG_HISTORY GROUP BY THREAD#)) APPL
WHERE
ARCH.THREAD#
= APPL.THREAD#
ORDER
BY 1;
2
3 4 5
6 7
Thread Last Sequence Received Last Sequence
Applied Difference
----------
---------------------- --------------------- ----------
1 11 11 0
Check
MRP0 process status
SQL>
SELECT STATUS FROM V$MANAGED_STANDBY WHERE PROCESS='MRP0';
STATUS
------------
WAIT_FOR_LOG
Archived
log applied time and status
SQL>
SELECT sequence#, first_time, next_time, applied FROM v$archived_log ORDER BY
sequence#;
SEQUENCE# FIRST_TIM NEXT_TIME APPLIED
----------
--------- --------- ---------
6 18-NOV-21 18-NOV-21 YES
7 18-NOV-21 18-NOV-21 YES
8 18-NOV-21 18-NOV-21 YES
9 18-NOV-21 18-NOV-21 YES
10 18-NOV-21 18-NOV-21 YES
11 18-NOV-21 18-NOV-21 YES
12 18-NOV-21 18-NOV-21 YES
13 18-NOV-21 18-NOV-21 YES
8
rows selected.
SQL>
select name,open_mode from v$database;
NAME
OPEN_MODE
---------
--------------------
VIGNESH MOUNTED
Step 13:- monitor the process in alert log
The best method to monitor data guard
process in alert log it shows as exact data transfer reports and errors we can
using the logs easily find out the mistakes
oracle@data
trace]$ pwd
/u01/app/oracle/diag/rdbms/data/data/trace
[oracle@data
trace]$ tail -100f alert_data.log
MRP0
(PID:26173): Media Recovery Log
/u01/app/oracle/fast_recovery_area/DATA/archivelog/2021_11_18/o1_mf_1_11_jsclfmk7_.arc
MRP0
(PID:26173): Media Recovery Waiting for T-1.S-12 (in transit)
2021-11-18T09:05:44.267442+05:30
rfs (PID:29555): Archived Log entry 7 added
for B-1088922080.T-1.S-12 ID 0x17a1415e LAD:2
rfs (PID:29555): No SRLs created for T-1
2021-11-18T09:05:44.297904+05:30
rfs (PID:29555): Opened log for T-1.S-13 dbid
396457310 branch 1088922080
2021-11-18T09:05:44.346775+05:30
MRP0
(PID:26173): Media Recovery Log
/u01/app/oracle/fast_recovery_area/DATA/archivelog/2021_11_18/o1_mf_1_12_jsclfnxx_.arc
MRP0
(PID:26173): Media Recovery Waiting for T-1.S-13 (in transit)
2021-11-18T09:05:45.670215+05:30
rfs (PID:29555): Archived Log entry 8 added
for B-1088922080.T-1.S-13 ID 0x17a1415e LAD:2
rfs (PID:29555): No SRLs created for T-1
2021-11-18T09:05:45.699219+05:30
rfs (PID:29555): Opened log for T-1.S-14 dbid
396457310 branch 1088922080
2021-11-18T09:05:46.482970+05:30
MRP0
(PID:26173): Media Recovery Log
/u01/app/oracle/fast_recovery_area/DATA/archivelog/2021_11_18/o1_mf_1_13_jscljj95_.arc
MRP0
(PID:26173): Media Recovery Waiting for T-1.S-14 (in transit)
2021-11-18T09:16:20.023804+05:30
