以下給大家展現一下10g物理standby主備之間通過switchover方式進行切換的詳細步驟，供參考。

1、主庫檢查是否為“TO?STANDBY”狀態，若不是，需要重新啟動一下主庫（主庫ora10g操作）
sys@ora10g>?select?switchover_status?from?v$database;

SWITCHOVER_STATUS
--------------------
SESSIONS?ACTIVE

sys@ora10g>?startup?force?;
ORACLE?instance?started.

Total?System?Global?Area?104857600?bytes
Fixed?Size?1266056?bytes
Variable?Size?83889784?bytes
Database?Buffers?16777216?bytes
Redo?Buffers?2924544?bytes
Database?mounted.
Database?opened.
sys@ora10g>?select?switchover_status?from?v$database;

SWITCHOVER_STATUS
--------------------
TO?STANDBY

2.將primary轉換為standby角色（主庫ora10g操作）
sys@ora10g>?alter?database?commit?to?switchover?to?physical?standby;

Database?altered.

3.原主庫重啟動到mount狀態（原主庫ora10g操作）
NotConnected@>?shutdown?immediate;
ORA-01507:?database?not?mounted


ORACLE?instance?shut?down.
NotConnected@>
NotConnected@>?startup?mount;
ORACLE?instance?started.

Total?System?Global?Area?104857600?bytes
Fixed?Size?1266056?bytes
Variable?Size?88084088?bytes
Database?Buffers?12582912?bytes
Redo?Buffers?2924544?bytes
Database?mounted.

4.檢查原備庫是否為“TO?PRIMARY”狀態，如果為“SWITCHOVER?PENDING”狀態，需要先進行一下恢復再切換?（待切換備庫ora10gdg操作）
ora10g@linux5?/home/oracle$?export?ORACLE_SID=ora10gdg
ora10gdg@linux5?/home/oracle$?sqlplus?/?as?sysdba

SQL*Plus:?Release?10.2.0.4.0?-?Production?on?Sat?Mar?28?08:26:53?2009

Copyright?(c)?1982,?2007,?Oracle.?All?Rights?Reserved.


Connected?to:
Oracle?Database?10g?Enterprise?Edition?Release?10.2.0.4.0?-?Production
With?the?Partitioning,?Data?Mining?and?Real?Application?Testing?options

NotConnected@>?select?switchover_status?from?v$database;

SWITCHOVER_STATUS
--------------------
SWITCHOVER?PENDING

NotConnected@>?alter?database?commit?to?switchover?to?primary;
alter?database?commit?to?switchover?to?primary
*
ERROR?at?line?1:
ORA-16139:?media?recovery?required

NotConnected@>?alter?database?recover?managed?standby?database?disconnect?from?session;

Database?altered.

NotConnected@>?alter?database?recover?managed?standby?database?cancel;

Database?altered.

NotConnected@>?select?switchover_status?from?v$database;

SWITCHOVER_STATUS
--------------------
TO?PRIMARY

5.原備庫轉換角色到primary?（待切換備庫ora10gdg操作）
NotConnected@>?alter?database?commit?to?switchover?to?primary;

Database?altered.

6.主備切換完成，open新的primary數據庫?（待切換備庫ora10gdg操作）
NotConnected@>?alter?database?open;

Database?altered.

7.最后驗證階段
1).新的primary庫在sec用戶創建一個新表test_new
sec@ora10g>?create?table?test_new?(a?int);

Table?created.

sec@ora10g>?insert?into?test_new?values?(?100?);

1?row?created.

sec@ora10g>?commit;

Commit?complete.

sec@ora10g>?select?*?from?test_new;

A
----------
100

sec@ora10g>?conn?/?as?sysdba
Connected.
sys@ora10g>?alter?system?switch?logfile;

System?altered.

sys@ora10g>?select?max(sequence#)?from?v$archived_log;

MAX(SEQUENCE#)
--------------
69

2).查看新standby庫，驗證切換是否成功
ora10gdg@linux5?/home/oracle$?export?ORACLE_SID=ora10g
ora10g@linux5?/home/oracle$?sqlplus?/?as?sysdba

SQL*Plus:?Release?10.2.0.4.0?-?Production?on?Sat?Mar?28?08:55:09?2009

Copyright?(c)?1982,?2007,?Oracle.?All?Rights?Reserved.


Connected?to:
Oracle?Database?10g?Enterprise?Edition?Release?10.2.0.4.0?-?Production
With?the?Partitioning,?Data?Mining?and?Real?Application?Testing?options

NotConnected@>?alter?database?recover?managed?standby?database?disconnect?from?session;

Database?altered.

NotConnected@>?select?max(sequence#)?from?v$archived_log;

MAX(SEQUENCE#)
--------------
69

NotConnected@>?alter?database?recover?managed?standby?database?cancel;

Database?altered.

NotConnected@>?alter?database?open?read?only;

Database?altered.

NotConnected@>?conn?sec/sec
Connected.
sec@ora10g>?select?*?from?test_new;

A
----------
100

OK！到此主備之間的switchover方式切換成功。

secooler
09.03.27

轉載于:https://blog.51cto.com/ecloud/1381045

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