Oracle 10g DataGuard 層級切換

環境：

OS: rhel 6.3_64bit

DB: Oracle 10gR2 

層級切換過程：

主庫

SQL>  select protection_mode,protection_level from v$database;

PROTECTION_MODE      PROTECTION_LEVEL
-------------------- --------------------
MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE
SQL> show parameter  log_archive_dest_2

NAME                                TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                  string      SERVICE=stdy LGWR ASYNC VALI
                                                D_FOR=(ONLINE_LOGFILES,PRIMARY
                                                _ROLE) DB_UNIQUE_NAME=stdy
SQL>  alter system set log_archive_dest_2='SERVICE=stdy OPTIONAL LGWR SYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stdy';

System altered.
：maximize 後可跟{PROTECTION | AVAILABILITY | PERFORMANCE}，分別對應最大保護，最高可用性及最高效能。
Minimum Requirements for Maximum Protection Mode
Redo Archival Process    LGWR
Network Transmission Mode    SYNC
Disk Write Option    AFFIRM
Standby Redo Logs?    Yes
Standby Database Type    Physical Only
 
alter system set log_archive_dest_2='SERVICE=stdy OPTIONAL LGWR SYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stdy';
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  213909504 bytes
Fixed Size                  2095152 bytes
Variable Size              88082384 bytes
Database Buffers          117440512 bytes
Redo Buffers                6291456 bytes
Database mounted.
SQL>  alter database set standby database to maximize Protection;

Database altered.
sys@ORA> select protection_mode,protection_level from v$database;

PROTECTION_MODE      PROTECTION_LEVEL
-------------------- --------------------
MAXIMUM PROTECTION  UNPROTECTED
SQL> alter database open;

Database altered.

SQL>  select protection_mode,protection_level from v$database;

PROTECTION_MODE      PROTECTION_LEVEL
-------------------- --------------------
MAXIMUM PROTECTION  MAXIMUM PROTECTION

Minimum Requirements for Maximum Availability Mode
Redo Archival Process    LGWR
Network Transmission Mode    SYNC
Disk Write Option    AFFIRM
Standby Redo Logs?    Required for physical standby databases only. Standby redo logs are not supported for logical standby databases.
Standby Database Type    Physical or Logical

alter system set log_archive_dest_2='SERVICE=stdy OPTIONAL LGWR SYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stdy';
 alter database set standby database to maximize Availability;

Minimum Requirements for Maximum Performance Mode
Redo Archival Process    LGWR or ARCH
Network Transmission Mode    ASYNC when using LGWR process. Not applicable when using the ARCH process.
Disk Write Option    NOAFFIRM
Standby Redo Logs?    Required for physical standby databases using the LGWR process.
Standby Database Type    Physical or Logical

alter system set log_archive_dest_2='SERVICE=stdy OPTIONAL LGWR ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=stdy';
 alter database set standby database to maximize Performance;
 
SQL>  alter database set standby database to maximize availability;

Database altered.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  213909504 bytes
Fixed Size                  2095152 bytes
Variable Size              88082384 bytes
Database Buffers          117440512 bytes
Redo Buffers                6291456 bytes
Database mounted.
Database opened.
SQL>  select protection_mode,protection_level from v$database;

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

備庫
停掉備庫後，主庫的狀態會變成待同步的狀態

SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

SQL>  select protection_mode,protection_level from v$database;

PROTECTION_MODE      PROTECTION_LEVEL
-------------------- --------------------
MAXIMUM AVAILABILITY RESYNCHRONIZATION

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