Fast-Start failover(FSFO) in Oracle 11g Dataguard

Failover is a one way process where your primary database goes down due to some reasons and to get back the production live without any data loss, you convert your existing Physical
Standby database to start behaving as Primary database..
The following conditions must be met before you can use the broker:

■ Primary and standby DB’s must be on same version
■ You must use a SPFILE to ensure the broker can persistently reconcile values between broker properties.
■ DG_BROKER_START parameter must be set to TRUE.
■ DG_BROKER_CONFIG_FILE file should be place in the shared area for RAC.
■ Oracle Net Services network files must be set up on the primary database and on the standby database.
■ To enable DGMGRL to restart instances during the course of broker operations, a service with a specific name must be statically registered with the local listener of each instance.
■ Ensure the COMPATIBLE initialization parameter is set to the same value on all systems.
■ Flashback database should be enable for fast start failover.

Introduction of FSFO observer:-
The Dataguard Broker Observer (Observer) is used when fast start failover is required. Fast start failover is simply an automatic failover to the standby database.This is not often
desired as most often even the most urgent failover/switchover scenarios require configuration of the Application once the database has been activated at the DR site.
The observer will initiate the failover under the following conditions automatically:
By default, the observer will initiate failover to the target standby if and only if ALL of the following are true:
• observer is running
• observer and the standby both lose contact with the primary
•
o Note: if the observer loses contact with the primary, but the standby does not, the observer can determine that the primary is still up via the standby.
• observer is still in contact with the standby
• durability constraints are met
• failover threshold timeout has elapsed
In Oracle 11g, the user can configure failover conditions:
User configurable failover conditions (11g and later)
Oracle Database 11g Rel 1 introduced user configurable failover conditions that can trigger the observer to initiate failover immediately.

Health conditions
Broker can be configured to initiate failover on any of the following conditions. Conditions shown in blue are enabled by default.
• Datafile Offline (due to IO errors)
• Corrupted Controlfile
• Corrupted Dictionary
• Inaccessible Logfile (due to IO errors)
• Stuck Archiver


Primary database Server : server1.soumya.com
Standby database Server : server2.soumya.com
Observer database server: observer.soumya.com

Primary database: prim
Standby database: stand
Observer database: observer

Here I have already done a physical standby server setup and its working properly.So I will only show how to configure DGMRL and use Fast-Start Failover using it.

Here is host file entry for for all server , make sure its present in each of the server.

# cat /etc/hosts
[oracle@server2 ~]$ cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.2.102   server1.soumya.com      server1
192.168.2.104   server2.soumya.com      server2
192.168.2.105   observer.soumya.com     observer


Step 1:- Check parameter DG_BROKER_START on primary and standby:
SQL> show parameter DG_BROKER_START

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dg_broker_start boolean FALSE

Step 2:- Set DG_BROKER_START  parameter to true on primary:

SQL> alter system set DG_BROKER_START=true scope=both;

System altered.

SQL> show parameter DG_BROKER_START

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
dg_broker_start                      boolean     TRUE


Step 3:- Define a service for the listener that includes the db_unique_name_DGMGRL.db_domain values for the GLOBAL_DBNAME
Update the listener.ora file on primary and standby database

In primary database :-

[oracle@server1 ~]$ cat /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = prim.soumya.com)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
      (SID_NAME = prim)
    )
  )

(SID_DESC =
(GLOBAL_DBNAME = prim_DGMGRL.soumya.com)
(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
INBOUND_CONNECT_TIMEOUT_LISTENER=120

-- save and quit (:wq)


In standby database:-

[oracle@server2 ~]$ cat /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = stand.soumya.com)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
      (SID_NAME = stand)
    )
  )

(SID_DESC =
(GLOBAL_DBNAME = stand_DGMGRL.soumya.com)
(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
INBOUND_CONNECT_TIMEOUT_LISTENER=120

-- save and quit (:wq)

Tnsnames.ora entry for all server:-

[oracle@ ~]$cat /u01/app/oracle/product/11.2.0/db_1/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)
    )
  )
observer
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = observer.soumya.com )(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = observer)
    )
  )


Once changes are done , restart the listener.

Step 4: Now lets create the data guard broker configurations:-

[oracle@server1 ~]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys/redhat@prim
Connected.
DGMGRL>  create configuration 'DBTEST'
> as primary database is 'prim'
> connect identifier is prim;
Configuration "DBTEST" created with primary database "prim"

DGMGRL> show configuration

Configuration - DBTEST

  Protection Mode: MaxPerformance
  Databases:
    prim - Primary database

Fast-Start Failover: DISABLED

Configuration Status:
DISABLED


Step 7 :- Now add standby database in data guard broker configuration:-

DGMGRL> add database 'stand' as
> connect identifier is stand
> maintained as physical;
Database "stand" added
DGMGRL>
DGMGRL> show configuration

Configuration - DBTEST

  Protection Mode: MaxPerformance
  Databases:
    prim  - Primary database
    stand - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
DISABLED

Step 8:-Now enable the configurations

DGMGRL> enable configuration
Enabled.
DGMGRL> show configuration

Configuration - DBTEST

  Protection Mode: MaxPerformance
  Databases:
    prim  - Primary database
    stand - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS


DGMGRL> show database verbose stand

Database - stand

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    stand

  Properties:
    DGConnectIdentifier             = 'stand'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'OPTIONAL'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'auto'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = 'prim, stand'
    LogFileNameConvert              = 'prim, stand'
    FastStartFailoverTarget         = ''
    StatusReport                    = '(monitor)'
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    HostName                        = 'server2.soumya.com'
    SidName                         = 'stand'
    StaticConnectIdentifier         = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=server2.soumya.com)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=stand_DGMGRL)(INSTANCE_NAME=stand)(SERVER=DEDICATED)))'
    StandbyArchiveLocation          = '/u01/app/oracle/flash_recovery_area'
    AlternateLocation               = ''
    LogArchiveTrace                 = '0'
    LogArchiveFormat                = '%t_%s_%r.dbf'
    TopWaitEvents                   = '(monitor)'

Database Status:
SUCCESS


DGMGRL>  show database verbose prim;

Database - prim

  Role:            PRIMARY
  Intended State:  TRANSPORT-ON
  Instance(s):
    prim

  Properties:
    DGConnectIdentifier             = 'prim'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'optional'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'auto'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = 'stand, prim'
    LogFileNameConvert              = 'stand, prim'
    FastStartFailoverTarget         = ''
    StatusReport                    = '(monitor)'
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    HostName                        = 'server1.soumya.com'
    SidName                         = 'prim'
    StaticConnectIdentifier         = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=server1.soumya.com)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=prim_DGMGRL)(INSTANCE_NAME=prim)(SERVER=DEDICATED)))'
    StandbyArchiveLocation          = '/u01/app/oracle/flash_recovery_area'
    AlternateLocation               = ''
    LogArchiveTrace                 = '0'
    LogArchiveFormat                = '%t_%s_%r.dbf'
    TopWaitEvents                   = '(monitor)'

Database Status:
SUCCESS

DGMGRL> enable configuration;
Enabled.
DGMGRL> show configuration;

Configuration - DBTEST

  Protection Mode: MaxPerformance
  Databases:
    prim  - Primary database
    stand - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS

DGMGRL> enable database stand;
Enabled.
DGMGRL> SHOW DATABASE VERBOSE stand;

Database - stand

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    stand

  Properties:
    DGConnectIdentifier             = 'stand'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'OPTIONAL'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'auto'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = 'prim, stand'
    LogFileNameConvert              = 'prim, stand'
    FastStartFailoverTarget         = ''
    StatusReport                    = '(monitor)'
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    HostName                        = 'server2.soumya.com'
    SidName                         = 'stand'
    StaticConnectIdentifier         = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=server2.soumya.com)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=stand_DGMGRL)(INSTANCE_NAME=stand)(SERVER=DEDICATED)))'
    StandbyArchiveLocation          = '/u01/app/oracle/flash_recovery_area'
    AlternateLocation               = ''
    LogArchiveTrace                 = '0'
    LogArchiveFormat                = '%t_%s_%r.dbf'
    TopWaitEvents                   = '(monitor)'

Database Status:
SUCCESS

Step 8 :-Ensure standby redologs are configured on primary & standby databases.

on primary Database:
SQL> set lines 200
SQL> col member for a50
SQL>
SQL> SELECT TYPE,MEMBER FROM V$LOGFILE;

TYPE    MEMBER
------- --------------------------------------------------
ONLINE  /u01/app/oracle/oradata/prim/redo03.log
ONLINE  /u01/app/oracle/oradata/prim/redo02.log
ONLINE  /u01/app/oracle/oradata/prim/redo01.log
STANDBY /u01/app/oracle/oradata/prim/redos4A.log
STANDBY /u01/app/oracle/oradata/prim/redos5A.log
STANDBY /u01/app/oracle/oradata/prim/redos6A.log
STANDBY /u01/app/oracle/oradata/prim/redos7A.log

7 rows selected.


On Standby Database:-
SQL> set lines 200
SQL> col member for a50
SQL> SELECT TYPE,MEMBER FROM V$LOGFILE;

TYPE    MEMBER
------- --------------------------------------------------
ONLINE  /u01/app/oracle/oradata/stand/redo03.log
ONLINE  /u01/app/oracle/oradata/stand/redo02.log
ONLINE  /u01/app/oracle/oradata/stand/redo01.log
STANDBY /u01/app/oracle/oradata/stand/redos4A.log
STANDBY /u01/app/oracle/oradata/stand/redos5A.log
STANDBY /u01/app/oracle/oradata/stand/redos6A.log
STANDBY /u01/app/oracle/oradata/stand/redos7A.log

7 rows selected.

Step 9:-  Configure the LogXptMode Property is set to SYNC

DGMGRL> EDIT DATABASE prim SET PROPERTY 'LogXptMode'='SYNC';
Property "LogXptMode" updated

DGMGRL> EDIT DATABASE stand SET PROPERTY 'LogXptMode'='SYNC';
Property "LogXptMode" updated

Step 10:-Configure the FastStartFailoverTarget property

DGMGRL> EDIT DATABASE prim SET PROPERTY
> FastStartFailoverTarget='stand';
Property "faststartfailovertarget" updated

DGMGRL> EDIT DATABASE stand SET PROPERTY
> FastStartFailoverTarget='prim';
Property "faststartfailovertarget" updated

Step 11:- Upgrade the protection mode to MAXAVAILABILITY, if required.
DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MAXAVAILABILITY;
Succeeded.

Step 12:-To enable the Flashback Mode run below queries on primary & standby database.

SQL> alter system set db_recovery_file_dest_size=1G;

System altered.

SQL> alter system set db_recovery_file_dest='/u01/app/oracle/flash_recovery_area';

System altered.

SQL> ALTER SYSTEM SET UNDO_RETENTION=3600 SCOPE=SPFILE;

System altered.

SQL> ALTER SYSTEM SET UNDO_MANAGEMENT='AUTO' SCOPE=SPFILE;

System altered.

Step 13:- Now restart the database one by one. and start the database in mount stage.But NOT TOGETHER.First on primary.

on Primary:-
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  413372416 bytes
Fixed Size                  2213896 bytes
Variable Size             314574840 bytes
Database Buffers           92274688 bytes
Redo Buffers                4308992 bytes
Database mounted.

SQL> ALTER DATABASE FLASHBACK ON;

Database altered.

SQL> alter database open;

Database altered.
SQL> select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
YES

On standby:-

SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount
ORACLE instance started.

Total System Global Area  413372416 bytes
Fixed Size                  2213896 bytes
Variable Size             314574840 bytes
Database Buffers           92274688 bytes
Redo Buffers                4308992 bytes
Database mounted.

SQL> alter database recover managed standby database cancel;

SQL> ALTER DATABASE FLASHBACK ON;

Database altered.

SQL> alter database open;

SQL> alter database recover managed standby database using current logfile disconnect from session;

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ ONLY WITH APPLY

SQL> select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
YES

Step 14:-Enable fast start failover
[oracle@server1 ~]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys/redhat@prim
Connected.
DGMGRL> show configuration verbose;

Configuration - DBTEST

  Protection Mode: MaxAvailability
  Databases:
    prim  - Primary database
    stand - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS

DGMGRL> show database stand;

Database - stand

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    stand

Database Status:
SUCCESS

DGMGRL> ENABLE FAST_START FAILOVER;
Enabled.

Step 15:- Start the observer
At Oberserver server(192.168.2.105):-
[oracle@observer ~]$ mkdir -p /u01/FSFO
[oracle@observer ~]$ cd /u01/FSFO
[oracle@observer  FSFO] ~]$ vi startobserver.sh
#!/bin/bash
# startobserver
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=/u01/app/oracle/product/11.2.0/db_1
export BASE_PATH=/u01/FSFO:/opt/CTEact/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/bin:/etc:/usr/local/maint/oracle:/usr/ccs/bin:/usr/openwin/bin:/usr/dt/bin:/usr/local/bin:.
export PATH=$ORACLE_HOME/bin:$BASE_PATH
dgmgrl << eof
connect sys/redhat@prim
START OBSERVER;
eof

-- save & exit (:wq)

[oracle@observer  FSFO] ~]$chmod 775 startobserver.sh

Now start the observer:-
[oracle@observer  FSFO] ~]$sh startobserver.sh
DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> Connected.
DGMGRL> Observer started


Step 16:-Verify the fast-start failover configuration
DGMGRL> SHOW CONFIGURATION VERBOSE;

Configuration - DBTEST

  Protection Mode: MaxAvailability
  Databases:
    prim  - Primary database
    stand - (*) Physical standby database

  (*) Fast-Start Failover target

Fast-Start Failover: ENABLED

  Threshold:        30 seconds
  Target:           stand
  Observer:         observer.soumya.com
  Lag Limit:        30 seconds (not in use)
  Shutdown Primary: TRUE
  Auto-reinstate:   TRUE

Configuration Status:
SUCCESS


DGMGRL> show database prim

Database - prim

  Role:            PRIMARY
  Intended State:  TRANSPORT-ON
  Instance(s):
    prim

Database Status:
SUCCESS

DGMGRL> show database stand

Database - stand

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    stand

Database Status:
SUCCESS

Step 17:- EXECUTE THE SWITCHOVER

DGMGRL> switchover to stand;
Performing switchover NOW, please wait...
New primary database "stand" is opening...
Operation requires shutdown of instance "prim" on database "prim"
Shutting down instance "prim"...
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
Operation requires startup of instance "prim" on database "prim"
Starting instance "prim"...
Unable to connect to database
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Failed.
Warning: You are no longer connected to ORACLE.

Please complete the following steps to finish switchover:
        start up instance "prim" of database "prim"


Start the database at primary server(192.168.2.102)
SQL> startup
Total System Global Area  413372416 bytes
Fixed Size                  2213896 bytes
Variable Size             360712184 bytes
Database Buffers           46137344 bytes
Redo Buffers                4308992 bytes
Database mounted.
Database opened.

[oracle@server1 ~]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys/redhat@prim
Connected.
DGMGRL>  show configuration verbose

Configuration - DBTEST

  Protection Mode: MaxAvailability
  Databases:
    stand - Primary database
    prim  - (*) Physical standby database

  (*) Fast-Start Failover target

Fast-Start Failover: ENABLED

  Threshold:        30 seconds
  Target:           prim
  Observer:         observer.soumya.com
  Lag Limit:        30 seconds (not in use)
  Shutdown Primary: TRUE
  Auto-reinstate:   TRUE

Configuration Status:
SUCCESS

DGMGRL> show database prim

Database - prim

  Role:            PHYSICAL STANDBY
  Intended State:  APPLY-ON
  Transport Lag:   0 seconds
  Apply Lag:       0 seconds
  Real Time Query: ON
  Instance(s):
    prim

Database Status:
SUCCESS


Step 18:-Failover to standby(old primary)
Note:- We will need to run this from the new standby database
[oracle@server1 ~]$ dgmgrl sys/redhat@prim

DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
Connected.
DGMGRL> failover to prim;
Performing failover NOW, please wait...
Failover succeeded, new primary is "prim"
DGMGRL> exit

Now once failover is completed, we will find that our old primary(prim) is back again in as primary database.
[oracle@server1 ~]$ sqlplus / as sysdba

SQL> select instance_name from v$instance;

INSTANCE_NAME
----------------
prim

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ WRITE

But we will need to start the standby database as it has been shutdown by dataguard broker process.

At standby server(192.168.2.104):-

SQL> startup mount
ORACLE instance started.

Total System Global Area  413372416 bytes
Fixed Size                  2213896 bytes
Variable Size             352323576 bytes
Database Buffers           54525952 bytes
Redo Buffers                4308992 bytes
Database mounted.
SQL> alter database recover managed standby database disconnect from session;
Database altered.
SQL> alter database open;

Database altered.

SQL> alter database recover managed standby database using current logfile disconnect from session;

Database altered.

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ ONLY WITH APPLY

Done...




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2 comments:

  1. stormSeptember 5, 2021 at 1:48 AM

    Hi Sowmya, need help to configure 19c/12c observer

    Best regards,
    Arjun

    ReplyDelete
  2. AnonymousFebruary 16, 2023 at 4:55 PM

    If you need to connect to database, you can try mysql data access components.

    ReplyDelete

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