Tag Archives: STANDBY

Dataguard – FAR SYNC

Here the article to how to create a dataguard with broker:
https://ezdba.wordpress.com/2017/05/15/dataguard-setup-with-broker/
FAR SYNC:
https://docs.oracle.com/database/121/SBYDB/create_fs.htm#SBYDB5441

Dataguard Far Sync.

Primary: Boston - hostname(vddl-ocme1-rac-01)
Standby: London - hostname(vddl-ocm-odg-01)

Far Sync:
bostonFS - hostname(vddl-ocm-odg-01)
londonFS - hostname(vddl-ocme1-rac-01)

tns entries on both sides for:

BOSTON 
LONDON 
LONDONFS 
BOSTONFS

1.)
create pfile='/tmp/initbostonFS.ora' from spfile;

2.)
alter database create far sync instance controlfile as '/tmp/bostonFS.ctl';

3.)
cp /opt/oracle/product/12.1.0.2/standalone/dbs/orapwboston /tmp

4.) 
[oracle@vddl-ocme1-rac-01 tmp]$ scp *boston* vddl-ocm-odg-01:/tmp
oracle@vddl-ocm-odg-01s password:
bostonFS.ctl 100% 17MB 17.4MB/s 00:00
initbostonFS.ora 100% 1983 1.9KB/s 00:00
orapwboston

5.) on Standby server:
mkdir -p /opt/oracle/oradata/bostonFS/
mkdir -p /opt/oracle/oradata/bostonFS/dev1/
mkdir -p /opt/oracle/fast_recovery_area/BOSTONFS
mkdir -p /opt/oracle/fast_recovery_area/bostonFS
mkdir -p /opt/oracle/admin/bostonFS/adump

6.) On Standby set the variables
. oraenv
bostonFS

7.) Edit

vi /tmp/initbostonFS.ora
:%s/boston/bostonFS/g

*.db_name='boston'
*.log_archive_config='dg_config=(boston,bostonFS,london,londonFS)'
*.log_archive_dest_2='SERVICE=london SYNC REOPEN=15 valid_for=(STANDBY_LOGFILES,STANDBY_ROLE) db_unique_name=london'
*.control_files='/opt/oracle/oradata/bostonFS/bostonFS01.ctl','/opt/oracle/fast_recovery_area/bostonFS/bostonFS02.ctl'
#*.local_listener='LISTENER_BOSTON'
*.db_unique_name=bostonFS
*.fal_server=boston
*.log_file_name_convert='boston','bostonFS'

8.) Copy controlfile

cp /tmp/bostonFS.ctl /opt/oracle/oradata/bostonFS/bostonFS01.ctl
cp /tmp/bostonFS.ctl /opt/oracle/fast_recovery_area/bostonFS/bostonFS02.ctl

9.) Copy Password FILE
cp /tmp/orapwboston $ORACLE_HOME/dbs/orapwbostonFS

10.) Check the environment variables to see if are pointed to bostonFS

set | grep ORA

11.) Create the spfile:

sqlplus / as sysdba
create spfile from pfile='/tmp/initbostonFS.ora';

12.) Mount the FAR Sync Instance:
startup mount;

13.) From Primary Server
sqlplus / as sysdba

--> Old Configurations
service="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=vddl-ocm-odg-01.lux.eproseed.com)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=london.example.com)(SERVER=DEDICATED)))", ASYNC NOAFFIRM delay=0 optional compression=disable max_failure=0 max_connections=1 reopen=300 db_unique_name="london" net_timeout=30,valid_for=(online_logfile,all_roles)

--> New configuration
alter system set log_archive_config='dg_config=(boston,bostonFS,london,londonFS,london2)' scope=both; --> Must be also on London Standby
alter system set log_archive_dest_2='SERVICE=bostonFS SYNC REOPEN=15 valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE) db_unique_name=bostonFS' scope=both;

14.) Check the sequences:

Primary:
SELECT MAX(SEQUENCE#), THREAD# FROM V$ARCHIVED_LOG GROUP BY THREAD#;

MAX(SEQUENCE#) THREAD#
-------------------- --------------------
 49 1

alter system switch logfile;

SELECT MAX(SEQUENCE#), THREAD# FROM V$ARCHIVED_LOG GROUP BY THREAD#;

MAX(SEQUENCE#) THREAD#
-------------------- --------------------
 50 1

StandBy: bostonFS,
At this time all of TNS must be working fine, check the logs (Broker) to see if there is no error inside.

SELECT MAX(SEQUENCE#), THREAD# FROM V$ARCHIVED_LOG GROUP BY THREAD#;

MAX(SEQUENCE#) THREAD#
-------------------- --------------------
 50 1

StandBy: london:

SELECT MAX(SEQUENCE#), THREAD# FROM V$ARCHIVED_LOG GROUP BY THREAD#;

MAX(SEQUENCE#) THREAD#
-------------------- --------------------
 50 1


15.) On standby server as bostonFS:
Check the Standby redolog files

1* select * from v$logfile
SQL> col member format a75
SQL> /

GROUP# STATUS TYPE MEMBER IS_ CON_ID
-------------------- ------- ------- --------------------------------------------------------------------------- --- --------------------
 3 ONLINE /opt/oracle/oradata/bostonFS/redo03.log NO 0
 2 ONLINE /opt/oracle/oradata/bostonFS/redo02.log NO 0
 1 ONLINE /opt/oracle/oradata/bostonFS/redo01.log NO 0
 4 STANDBY /opt/oracle/fast_recovery_area/BOSTONFS/onlinelog/o1_mf_4_dn7z8tbx_.log YES 0
 5 STANDBY /opt/oracle/fast_recovery_area/BOSTONFS/onlinelog/o1_mf_5_dn7z8wgm_.log YES 0
 6 STANDBY /opt/oracle/fast_recovery_area/BOSTONFS/onlinelog/o1_mf_6_dn7z8x7c_.log YES 0
 7 STANDBY /opt/oracle/fast_recovery_area/BOSTONFS/onlinelog/o1_mf_7_dn7z8tbm_.log YES 0

16.) Adding a second far sync, now for London standby. When London becomes primary the archived logs will sent to londonFS
instead of to send to boston.

. oraenv
boston

connect to vddl-ocme1-rac-01 - PRIMARY

[oracle@vddl-ocme1-rac-01 trace]$ cd /tmp
[oracle@vddl-ocme1-rac-01 tmp]$ ls -ltr
total 17988
drwx------. 2 root root 40 Jun 2 11:29 hsperfdata_root
-rw-r--r--. 1 oracle oinstall 135548 Jun 13 15:52 dwh_test.log
drwxr-xr-x. 2 oracle oinstall 60 Jun 14 22:19 hsperfdata_oracle
-rw-r--r--. 1 oracle oinstall 1983 Jun 16 16:01 initbostonFS.ora <-------
-rw-r-----. 1 oracle oinstall 18268160 Jun 16 16:01 bostonFS.ctl
-rw-r-----. 1 oracle oinstall 7680 Jun 16 16:02 orapwboston

mv /tmp/initbostonFS.ora /tmp/initlondonFS.ora

mkdir -p /opt/oracle/oradata/londonFS/
mkdir -p /opt/oracle/oradata/londonFS/dev1/
mkdir -p /opt/oracle/fast_recovery_area/LONDONFS
mkdir -p /opt/oracle/fast_recovery_area/londonFS
mkdir -p /opt/oracle/admin/londonFS/adump

17.) Fix the /tmp/initlondonFS.ora

:%s/boston/london/g

please fix:

*.db_name='boston'
*.control_files='/opt/oracle/oradata/londonFS/londonFS01.ctl','/opt/oracle/fast_recovery_area/londonFS/londonFS02.ctl'
*.log_archive_config='dg_config=(boston,bostonFS,london,londonFS,london2)'
*.log_file_name_convert='boston','londonFS'
*.log_archive_dest_2='SERVICE=boston ASYNC REOPEN=15 valid_for=(STANDBY_LOGFILES,STANDBY_ROLE) db_unique_name=boston'
*.db_unique_name=londonFS
*.fal_server=london

18.) Copy controlfiles

[oracle@vddl-ocme1-rac-01 tmp]$ ls -tlr /tmp/*.ctl
-rw-r-----. 1 oracle oinstall 18268160 Jun 16 16:01 /tmp/bostonFS.ctl

cp /tmp/bostonFS.ctl /opt/oracle/oradata/londonFS/londonFS01.ctl
cp /tmp/bostonFS.ctl /opt/oracle/fast_recovery_area/londonFS/londonFS02.ctl

19.) Copy Passwordfile

[oracle@vddl-ocme1-rac-01 tmp]$ ls -ltr /tmp/orapw*
-rw-r-----. 1 oracle oinstall 7680 Jun 16 16:02 /tmp/orapwboston

cp /tmp/orapwboston $ORACLE_HOME/dbs/orapwlondonFS

19.) env variables

please include londonFS in /etc/oratab

. oraenv
londonFS

20.) Create spfile for londonFS
sqlplus / as sysdba
create spfile from pfile='/tmp/initlondonFS.ora';
startup mount;

21.) On standby Server:

. oraenv
london

sqlplus / as sysdba

SQL> show parameter log_archive_dest_2

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2 string

alter system set log_archive_dest_2='SERVICE=londonFS SYNC REOPEN=15 valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE) db_unique_name=londonFS' scope=both;

Now the far sync for London database is done, this will be tested during the switchover tests.

 

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Dataguard Setup with Broker

Container Database: cdbst -> cdbstdg
Primary: odasys12
StandBy: odasys11

1.) Primary - Check Archive Log Mode:

sqlplus / as sysdba

SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     15
Next log sequence to archive   17
Current log sequence           17

2.) Primary - FORCE LOGGING

ALTER DATABASE FORCE LOGGING;
ALTER SYSTEM SWITCH LOGFILE;

3.) Primary - Standby Redo Log Files (SUM of Redo Logs + 1 with the max size of redo log files)

col member format A60
select * from v$logfile;

    GROUP# STATUS  TYPE    MEMBER                                                       IS_     CON_ID
---------- ------- ------- ------------------------------------------------------------ --- ----------
         1         ONLINE  +REDO/CDBST/ONLINELOG/group_1.334.942934501                  NO           0
         2         ONLINE  +REDO/CDBST/ONLINELOG/group_2.287.942934507                  NO           0
         3         ONLINE  +REDO/CDBST/ONLINELOG/group_3.292.942934511                  NO           0

SQL> select max(bytes) / (1024*1024) mb from v$log;

        MB
----------
      1024

ALTER DATABASE ADD STANDBY LOGFILE ('+REDO/CDBST/ONLINELOG/standby_redo01.log') SIZE 1g;
ALTER DATABASE ADD STANDBY LOGFILE ('+REDO/CDBST/ONLINELOG/standby_redo02.log') SIZE 1g;
ALTER DATABASE ADD STANDBY LOGFILE ('+REDO/CDBST/ONLINELOG/standby_redo03.log') SIZE 1g;
ALTER DATABASE ADD STANDBY LOGFILE ('+REDO/CDBST/ONLINELOG/standby_redo04.log') SIZE 1g;

4.) Primary - Enable Flashback Database      
ALTER DATABASE FLASHBACK ON;

5.) Primary - Init Parameters

SQL> show parameter db_name

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_name                              string      cdbst

SQL> show parameter db_unique_name

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                       string      cdbst

ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT=AUTO scope=both;

6.)  Primary/StandBy - Listener.ora

Specific Listener for DRP
PORT: 1527
Name: LISTENER_DG
ORACLE_HOME: /u01/app/oracle/product/12.1.0.2/dbhome_1

srvctl add listener -l LISTENER_DG -o $ORACLE_HOME -p 1527
srvctl start listener -l LISTENER_DG -n odasys12
srvctl start listener -l LISTENER_DG -n odasys11

a.) Primary - include into Listener.ora

SID_LIST_LISTENER_DG =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = cdbst_DGMGRL)
      (ORACLE_HOME = /u01/app/oracle/product/12.1.0.2/dbhome_1)
      (SID_NAME = cdbst)
    )
  )

lsnrctl reload LISTENER_DG
lsnrctl status LISTENER_DG

Service "cdbst_DGMGRL" has 1 instance(s).
  Instance "cdbst", status UNKNOWN, has 1 handler(s) for this service...

-- Include the Host/Port into the LOCAL_LISTENER to listener on the new port
alter system set LOCAL_LISTENER="(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=odasys12)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=odasys12)(PORT=1527)))" scope=BOTH;  
  
b.) StandBy - include into Listener.ora

SID_LIST_LISTENER_DG =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = cdbstdg_DGMGRL)
      (ORACLE_HOME = /u01/app/oracle/product/12.1.0.2/dbhome_1)
      (SID_NAME = cdbstdg)
    )
  )

lsnrctl reload LISTENER_DG
lsnrctl status LISTENER_DG

Service "cdbstdg_DGMGRL" has 1 instance(s).
  Instance "cdbst", status UNKNOWN, has 1 handler(s) for this service...

7.) TNS Entries -  Include this TNS for both servers

CDBSTP =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = odasys12.bgl.lu)(PORT = 1527))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (sid = cdbst)
    )
  )

CDBSTDG =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = odasys11.bgl.lu)(PORT = 1527))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (sid = cdbstdg)
    )
  )

Note: After configure both tnsnames.ora test with tnsping the entries.  

8.) Duplicate
StandBy Database Name: cdbstdg

a.) On the primary database:

create pfile='initcdbstdg.ora' from spfile;

scp initcdbstdg.ora odasys11:/u01/app/oracle/product/12.1.0.2/dbhome_1/dbs
scp orapwcdbst odasys11:/u01/app/oracle/product/12.1.0.2/dbhome_1/dbs

b.) On the Standby Server:
cd /u01/app/oracle/product/12.1.0.2/dbhome_1/dbs
cp orapwcdbst orapwcdbstdg

vi initcdbstdg.ora
:%s/cdbst/cdbstdg/g

- Check the Parameters to see if there are some specific configurations to fix
*.db_name='cdbst' --> must keep the same for both sites
*.db_unique_name='cdbstdg' --> include 

mkdir -p /u01/app/oracle/admin/cdbstdg/adump

c.) Preparing the ASM to Receive the CDB and PDBs:

- Controlfile:
inside of the init.ora for the standby there is:
*.control_files='+REDO/CDBST/CONTROLFILE/current.331.942934501'

asmcmd
cd +REDO
mkdir CDBSTDG
cd CDBSTDG
mkdir CONTROLFILE

Change the controlfile parameter to:

*.control_files='+REDO/CDBSTDG/CONTROLFILE/control_cdbstdg.ctl'

- Datafiles on PRIMARY:
Directories to CONVERT CLAUSE
col DIRECTORY format a60
select distinct substr(file_name,1,instr(file_name,'/',-1)) directory from cdb_data_files;

+DATA/NSCDB2/DATAFILE/
+DATA/NSCDB1/datafile/
+DATA/CDBST/DATAFILE/
+DATA/NSCDB1/DATAFILE/
+DATA/NSCDB3/DATAFILE/

select distinct substr(member,1,instr(member,'/',-1)) directory from v$logfile;

+REDO/CDBST/ONLINELOG/

- Create the directories on ASM to receive the files

+DATA/DG/NSCDB2/DATAFILE/
+DATA/DG/NSCDB1/datafile/
+DATA/DG/CDBST/DATAFILE/
+DATA/DG/NSCDB1/DATAFILE/
+DATA/DG/NSCDB3/DATAFILE/

+REDO/DG/CDBST/ONLINELOG/

- create the file DupDG.rman

cd /home/oracle/scripts

vi DupDG.rman

DUPLICATE TARGET DATABASE
  FOR STANDBY
  FROM ACTIVE DATABASE
  DORECOVER
  NOFILENAMECHECK;

d.) Start the standby instance:

- Include into /etc/oratab
cdbstdg:/u01/app/oracle/product/12.1.0.2/dbhome_1:N

. oraenv
cdbstdg

sqlplus / as sysdba 
create spfile='+DATA/DG/spfilecdbstdg.ora' from pfile;
- change the initcdbstdg.ora
-- > SPFILE='+DATA/DG/spfilecdbstdg.ora'

startup nomount;

alter system set LOCAL_LISTENER="(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=odasys11)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=odasys11)(PORT=1527)))" scope=BOTH;  
alter system  SET db_file_name_convert='+DATA/NSCDB2/DATAFILE/','+DATA/DG/NSCDB2/DATAFILE/','+DATA/NSCDB1/datafile/','+DATA/DG/NSCDB1/datafile/','+DATA/CDBST/DATAFILE/','+DATA/DG/CDBST/DATAFILE/','+DATA/NSCDB1/DATAFILE/','+DATA/DG/NSCDB1/DATAFILE/','+DATA/NSCDB3/DATAFILE/','+DATA/DG/NSCDB3/DATAFILE/' scope=spfile;
alter system  SET log_file_name_convert='+REDO/CDBST/ONLINELOG/','+REDO/DG/CDBST/ONLINELOG/' scope=spfile;
alter system  SET job_queue_processes=0 scope=both;

shut immediate
startup nomount;

-- On this case as the CONVERT parameter is used, is need to set on the primary also;
alter system  SET db_file_name_convert='+DATA/DG/NSCDB2/DATAFILE/','+DATA/NSCDB2/DATAFILE/','+DATA/DG/NSCDB1/datafile/','+DATA/NSCDB1/datafile/','+DATA/DG/CDBST/DATAFILE/','+DATA/CDBST/DATAFILE/','+DATA/DG/NSCDB1/DATAFILE/','+DATA/NSCDB1/DATAFILE/','+DATA/DG/NSCDB3/DATAFILE/','+DATA/NSCDB3/DATAFILE/' scope=spfile;
alter system  SET log_file_name_convert='+REDO/DG/CDBST/ONLINELOG/','+REDO/CDBST/ONLINELOG/' scope=spfile;

-- If the parameter needs to be changed after the BROKER is already configured use the commands below:
edit database 'cdbst' set property 'DbFileNameConvert'='+DATA/DG/NSCDB2/DATAFILE/,+DATA/NSCDB2/DATAFILE/,+DATA/DG/NSCDB1/datafile/,+DATA/NSCDB1/datafile/,+DATA/DG/CDBST/DATAFILE/,+DATA/CDBST/DATAFILE/,+DATA/DG/NSCDB1/DATAFILE/,+DATA/NSCDB1/DATAFILE/,+DATA/DG/NSCDB3/DATAFILE/,+DATA/NSCDB3/DATAFILE/';
edit database 'cdbst' set property 'LogFileNameConvert'='+REDO/DG/CDBST/ONLINELOG/,+REDO/CDBST/ONLINELOG/';
show database 'cdbst' 'InconsistentProperties';

---> Test the connections using TNS
rman target sys/welcome1@CDBSTP AUXILIARY sys/welcome1@odasys11:1527/cdbstdg_DGMGRL
-- It should works in both servers

e.) Execute the Duplicate
cd $ORACLE_HOME/dbs

rman target sys/welcome1@CDBSTP AUXILIARY sys/welcome1@odasys11:1527/cdbstdg_DGMGRL @DupDG.rman log DupDG.log

Finished recover at 04/05/2017 14:23:22
Finished Duplicate Db at 04/05/2017 14:23:49

9.) Broker

-- Both Servers:
ALTER SYSTEM SET dg_broker_start=true;

-- PRIMARY
dgmgrl sys/welcome1@cdbst
CREATE CONFIGURATION cdbst_config AS PRIMARY DATABASE IS cdbst CONNECT IDENTIFIER IS cdbstp;
ADD DATABASE cdbstdg AS CONNECT IDENTIFIER IS cdbstdg MAINTAINED AS PHYSICAL;
ENABLE CONFIGURATION;
SHOW CONFIGURATION;
show database cdbst;
show database cdbstdg;

-- Choose the best option for the Environment: maxavailability (Enabled)
edit database 'cdbst' set property 'LogXptMode'='SYNC';
edit database 'cdbstdg' set property 'LogXptMode'='SYNC';
edit configuration set protection mode as maxavailability;

-- To change to maxperformance
edit configuration set protection mode as maxperformance;
edit database 'cdbst' set property 'LogXptMode'='ASYNC';
edit database 'cdbstdg' set property 'LogXptMode'='ASYNC';

10.) Configure FAL / FLASHBACK

- FAL

Primary:
alter system set fal_client=cdbstp scope=both;
alter system set fal_server=cdbstdg scope=both;

StandBy:
alter system set fal_server=cdbstp scope=both;
alter system set fal_client=cdbstdg scope=both;

- FLASHBACK

dgmgrl sys/welcome1
edit database 'cdbstdg' set state='APPLY-OFF';
exit
sqlplus / as sysdba 
alter database  flashback on;
exit
dgmgrl sys/welcome1
edit database 'cdbstdg' set state='APPLY-ON';

11.) Including the database into the ocr

srvctl add database -d cdbstdg -o /u01/app/oracle/product/12.1.0.2/dbhome_1 -r physical_standby -s mount -a DATA,REDO,RECO -p '+DATA/DG/spfilecdbstdg.ora'
srvctl add instance -d cdbstdg -i cdbstdg -n odasys11

- test on Standby:

srvctl stop database -d cdbstdg
srvctl start database -d cdbstdg
dgmgrl sys/welcome1@cdbstp
show configuration

12.) Switchover

-- Check if is possible execute the switchover

validate database verbose 'cdbst';
Database Role:    Primary database
Ready for Switchover:  Yes
 
-- PRIMARY

salplus / as sysdba

SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 NSCDB1                         READ WRITE NO
         4 NSCDB2                         READ WRITE NO
         5 NSCDB3                         READ WRITE NO

SQL> alter session set container=NSCDB1;

Session altered.

SQL> select tablespace_name from dba_data_files;

TABLESPACE_NAME
------------------------------
SYSTEM
SYSAUX
USERS
TS_TEST

SQL> create user dr identified by dr;

User created.

SQL> grant dba to dr;

Grant succeeded.

SQL> alter user dr default tablespace TS_TEST;

User altered.

SQL> create table dr.teste as select * from dba_users;

Table created.

SQL> select count(*) from dr.teste;

  COUNT(*)
----------
        21

exit

dgmgrl sys/welcome1@cdbstp
switchover to cdbstdg;
Performing switchover NOW, please wait...
Operation requires a connection to instance "cdbstdg" on database "cdbstdg"
Connecting to instance "cdbstdg"...
Connected as SYSDBA.
New primary database "cdbstdg" is opening...
Oracle Clusterware is restarting database "cdbst" ...
Switchover succeeded, new primary is "cdbstdg"

DGMGRL> show configuration

Configuration - cdbst_config

  Protection Mode: MaxAvailability
  Members:
  cdbstdg - Primary database
    cdbst   - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS   (status updated 7 seconds ago)

-- StandBy (Now Primary)

sqlplus / as sysdba

SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 NSCDB1                         READ WRITE NO
         4 NSCDB2                         READ WRITE NO
         5 NSCDB3                         READ WRITE NO

alter session set container=NSCDB1;

SQL> select count(*) from dr.teste;

  COUNT(*)
----------
        21

        
--> Switching Back
odasys12:

dgmgrl sys/welcome1

DGMGRL> show configuration;

Configuration - cdbst_config

  Protection Mode: MaxAvailability
  Members:
  cdbstdg - Primary database
    cdbst   - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS   (status updated 57 seconds ago)

DGMGRL> validate database cdbstdg;

  Database Role:    Primary database

  Ready for Switchover:  Yes

  Flashback Database Status:
    cdbstdg:  Off

DGMGRL> switchover to cdbst;
Performing switchover NOW, please wait...
Operation requires a connection to instance "cdbst" on database "cdbst"
Connecting to instance "cdbst"...
Connected as SYSDBA.
New primary database "cdbst" is opening...
Oracle Clusterware is restarting database "cdbstdg" ...
Switchover succeeded, new primary is "cdbst"


DGMGRL> show configuration

Configuration - cdbst_config

  Protection Mode: MaxAvailability
  Members:
  cdbst   - Primary database
    cdbstdg - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS   (status updated 11 seconds ago)

SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 NSCDB1                         READ WRITE NO
         4 NSCDB2                         READ WRITE NO
         5 NSCDB3                         READ WRITE NO