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Friday, April 1, 2016

CHANGE STANDBY DATABASE PROTECTION MODE

SQL> select protection_mode from v$database;

PROTECTION_MODE
--------------------
MAXIMUM PERFORMANCE

SQL> show parameter log_archive_dest_2

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2             string     SERVICE=ORCLSTB1 NOAFFIRM ASYN
                         C VALID_FOR=(ONLINE_LOGFILES,P
                         RIMARY_ROLE) DB_UNIQUE_NAME=OR
                         CLSTB1
log_archive_dest_20             string
log_archive_dest_21             string
log_archive_dest_22             string
log_archive_dest_23             string
log_archive_dest_24             string
log_archive_dest_25             string
log_archive_dest_26             string

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_27             string
log_archive_dest_28             string
log_archive_dest_29             string
SQL> show parameter db_unique_name

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                 string     ORCL
SQL> show parameter log_archive_config

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
log_archive_config             string     dg_config=(ORCL,ORCLSTB1,ORCLS
                         TB2)
SQL> alter system set log_archive_dest_2='SERVICE=ORCLSTB1 NOAFFIRM ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=ORCLSTB1';

System altered.

SQL> show parameter log_archive_dest_2

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2             string     SERVICE=ORCLSTB1 NOAFFIRM ASYN
                         C VALID_FOR=(ONLINE_LOGFILES,P
                         RIMARY_ROLE) DB_UNIQUE_NAME=OR
                         CLSTB1
log_archive_dest_20             string
log_archive_dest_21             string
log_archive_dest_22             string
log_archive_dest_23             string
log_archive_dest_24             string
log_archive_dest_25             string
log_archive_dest_26             string

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_27             string
log_archive_dest_28             string
log_archive_dest_29             string

SQL> alter system set log_archive_dest_2='SERVICE=ORCLSTB1 NOAFFIRM SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=ORCLSTB1';

System altered.


SQL> alter database set standby database to maximize availability;

Database altered.

NOTE: You don’t need to shutdown your instance, when you are changing  protection mode from MAXIMUM PERFORMANCE TO MAXIMUM AVAILABILITY.But you need to if you are going to MAXIMUM PROTECTION.

SQL> alter system switch logfile;

System altered.

SQL> select protection_mode from v$database;

PROTECTION_MODE
--------------------
MAXIMUM AVAILABILITY

SQL> archive log list;
Database log mode           Archive Mode
Automatic archival           Enabled
Archive destination           /u01/app/oracle/oraarch/
Oldest online log sequence     239
Next log sequence to archive   241
Current log sequence           241
SQL> select group#,bytes/1024/1024 from v$standby_log;

    GROUP# BYTES/1024/1024
---------- ---------------
     4        52
     5        52
     6        52
     7        52


SQL> select thread#,max(sequence#) from v$archived_log group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
     1          240

SQL> select protection_mode from v$database;

PROTECTION_MODE
--------------------
MAXIMUM AVAILABILITY



SQL> alter system switch logfile;

System altered.

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