DG_三大模式切换

===================================
1  最大性能模式MAXIMUM PERFORMANCE   ------默认模式
===================================

一 最大性能模式特点


192.168.1.181

SQL> select database_role,protection_mode,protection_level from v$database;

DATABASE_ROLE    PROTECTION_MODE      PROTECTION_LEVEL
---------------- -------------------- --------------------
PRIMARY          MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE


SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;

DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID

SQL> show parameter log_archive
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_config                   string      dg_config=(orcl,db01)
log_archive_dest_1                   string      location=/home/oracle/arch_orc
                                                 l valid_for=(all_logfiles,all_
                                                 roles) db_unique_name=orcl

log_archive_dest_2                   string      service=db_db01 LGWR ASYNC val
                                                 id_for=(online_logfiles,primar
                                                 y_roles) db_unique_name=db01

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     31
Next log sequence to archive   33
Current log sequence           33


192.168.1.183
SQL> select database_role,protection_mode,protection_level from v$database;
DATABASE_ROLE    PROTECTION_MODE      PROTECTION_LEVEL
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE


SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;
DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID


SQL> show parameter log_archive
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_config                   string      dg_config=(db01,orcl)
log_archive_dest_1                   string      location=/home/oracle/arch_db0
                                                 1 valid_for=(all_logfiles,all_
                                                 roles) db_unique_name=db01

log_archive_dest_2                   string      service=db_orcl LGWR ASYNC val
                                                 id_for=(online_logfiles,primar
                                                 y_roles) db_unique_name=orcl




SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     31
Next log sequence to archive   33
Current log sequence           33


192.168.1.181

SQL> alter system switch logfile;

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     32
Next log sequence to archive   34
Current log sequence           34


192.168.1.183

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_db01
Oldest online log sequence     32
Next log sequence to archive   0
Current log sequence           34



===================================
2 最大性能模式--切换到-->最大高可用  (默认是最大性能模式---MAXIMUM PERFORMANCE)
===================================
192.168.1.181
SQL> select DATABASE_ROLE,PROTECTION_MODE,PROTECTION_LEVEL from v$database;  

DATABASE_ROLE    PROTECTION_MODE      PROTECTION_LEVEL
---------------- -------------------- --------------------
PRIMARY          MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE


SQL> show parameter log_archive_dest_2
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      service=db_db01 LGWR ASYNC val
                                                 id_for=(online_logfiles,primar
                                                 y_roles) db_unique_name=db01



192.168.1.181
SQL> shutdown immediate

192.168.1.183
SQL> alter database recover managed standby database cancel;

SQL> shutdown immediate

192.168.1.181
SQL> startup mount;
SQL> alter database set standby database to maximize availability;
SQL> alter system set log_archive_dest_2='service=db_db01 LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=db01' scope=spfile;


192.168.1.183

SQL> startup nomount

SQL> alter database mount standby database;

SQL> alter system set log_archive_dest_2='service=db_orcl LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=orcl' scope=spfile;

SQL> shutdown immediate

SQL> startup nomount

SQL> alter database mount standby database;

192.168.1.181

SQL> startup

SQL> col dest_name for a25

SQL> select dest_name,status from v$archive_dest_status;

DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID



SQL> show parameter log_archive_dest_2

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      service=db_db01 LGWR SYNC vali
                                                 d_for=(online_logfiles,primary
                                                 _roles) db_unique_name=db01


SQL> select database_role,protection_level,protection_mode from v$database;

DATABASE_ROLE    PROTECTION_LEVEL     PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY          MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY


SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     34
Next log sequence to archive   36
Current log sequence           36


192.168.1.183

SQL> col dest_name for a25

SQL> select dest_name,status from v$archive_dest_status;

DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID




SQL> show parameter log_archive_dest_2

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      service=db_orcl LGWR SYNC vali
                                                 d_for=(online_logfiles,primary
                                                 _roles) db_unique_name=orcl


SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE    PROTECTION_LEVEL     PROTECTION_MODE
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_db01
Oldest online log sequence     35
Next log sequence to archive   0
Current log sequence           36

192.168.1.181

SQL> alter system switch logfile;

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     35
Next log sequence to archive   37
Current log sequence           37

192.168.1.183

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_db01
Oldest online log sequence     36
Next log sequence to archive   0
Current log sequence           37



===================================
3 最大高可用--切换到-->最保护能模式
===================================

DG最大保护模式Maximum protection


192.168.1.181
SQL> shutdown immediate

192.168.1.183
SQL> shutdown immediate

192.168.1.181
SQL> alter database set standby database to maximize protection;

SQL> shutdown immediate

192.168.1.183
SQL> startup nomount

SQL> alter database mount standby database;

192.168.1.181
SQL> startup

SQL> col dest_name for a25

SQL> select dest_name,status from v$archive_dest_status;

DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID

SQL> show parameter log_archive_dest_2

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      service=db_db01 LGWR SYNC vali
                                                 d_for=(online_logfiles,primary
                                                 _roles) db_unique_name=db01


SQL> select database_role,protection_level,protection_mode from v$database;

DATABASE_ROLE    PROTECTION_LEVEL     PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY          MAXIMUM PROTECTION   MAXIMUM PROTECTION

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     37
Next log sequence to archive   39
Current log sequence           39


192.168.1.183

SQL> col dest_name for a25
SQL> select dest_name,status from v$archive_dest_status;

DEST_NAME                 STATUS
------------------------- ---------
LOG_ARCHIVE_DEST_1        VALID
LOG_ARCHIVE_DEST_2        VALID


SQL> show parameter log_archive_dest_2

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      service=db_db01 LGWR SYNC vali
                                                 d_for=(online_logfiles,primary
                                                 _roles) db_unique_name=db01




SQL> select database_role,protection_level,protection_mode from v$database;

DATABASE_ROLE    PROTECTION_LEVEL     PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY          MAXIMUM PROTECTION   MAXIMUM PROTECTION

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_db01
Oldest online log sequence     37
Next log sequence to archive   0
Current log sequence           39

192.168.1.181

SQL> alter system switch logfile;

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_orcl
Oldest online log sequence     38
Next log sequence to archive   40
Current log sequence           40

192.168.1.183

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/arch_db01
Oldest online log sequence     37
Next log sequence to archive   0
Current log sequence           40



















来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/29785807/viewspace-1355291/,如需转载,请注明出处,否则将追究法律责任。

转载于:http://blog.itpub.net/29785807/viewspace-1355291/

你可能感兴趣的:(DG_三大模式切换)