dataguard switchover to physical stnadby

首先做一系列的check

check 当前primary 的 standby redo log是否存在

SQL> select * from v$logfile;

    GROUP# STATUS  TYPE    MEMBER                                                  IS_
---------- ------- ------- ------------------------------------------------------- ---
                  ONLINE  /oracle_asm/standby/itid1/datafile/itid/redo03.log      NO
                  ONLINE  /oracle_asm/standby/itid1/datafile/itid/redo02.log      NO
                  ONLINE  /oracle_asm/standby/itid1/datafile/itid/redo01.log      NO
                  STANDBY /oracle_asm/standby/itid1/standby_redo/slog1.rdo        NO
                  STANDBY /oracle_asm/standby/itid1/standby_redo/slog2.rdo        NO
                  STANDBY /oracle_asm/standby/itid1/standby_redo/slog3.rdo        NO
                  STANDBY /oracle_asm/standby/itid1/standby_redo/slog4.rdo        NO

check standby 的redo log是否存在

SQL> select * from v$logfile;

    GROUP# STATUS  TYPE    MEMBER                                                  IS_
---------- ------- ------- ------------------------------------------------------- ---
         3         ONLINE  /oracle_asm/standby/itid2/datafile/itid/redo03.log      NO
         2         ONLINE  /oracle_asm/standby/itid2/datafile/itid/redo02.log      NO
         1         ONLINE  /oracle_asm/standby/itid2/datafile/itid/redo01.log      NO
         4         STANDBY /oracle_asm/standby/itid1/standby_redo/slog1.rdo        NO
         5         STANDBY /oracle_asm/standby/itid1/standby_redo/slog2.rdo        NO
         6         STANDBY /oracle_asm/standby/itid1/standby_redo/slog3.rdo        NO
         7         STANDBY /oracle_asm/standby/itid2/standby_redo/slog1.rdo        NO
         8         STANDBY /oracle_asm/standby/itid2/standby_redo/slog2.rdo        NO
         9         STANDBY /oracle_asm/standby/itid2/standby_redo/slog3.rdo        NO
        10         STANDBY /oracle_asm/standby/itid2/standby_redo/slog4.rdo        NO
        11         STANDBY /oracle_asm/standby/itid2/datafile/log1.rdo             NO
        12         STANDBY /oracle_asm/standby/itid2/datafile/log2.rdo             NO
        13         STANDBY /oracle_asm/standby/itid2/datafile/log3.rdo             NO

oops 现在才发现之前创建standby的时候创建的standby redo log太多了。其实group 11 12 13 是我想创建成为redo log的。但是不小心的加上了standby参数。从这里也可以看出创建standby redo 和 redo 的命令就在于有没有standby 这个参数。 不过奇怪的是，既然我创建redo的命令错了，那么为什么还是有redo生成了呢？ 这个也许是oracle自己生成的。

check primary的 log_archive_dest_n参数

SQL> select name,value from v$parameter where name like 'log_archive_dest_%' and name not like '%state%' and value is not null;

NAME                         VALUE
---------------------------- ------------------------------------------------------------------------------------
log_archive_dest_1           LOCATION=/oracle_asm/standby/itid1/arch
log_archive_dest_2           SERVICE=itid2 SYNC VALID_FOR=( ONLINE_LOGFILES,PRIMARY_ROLE)  DB_UNIQUE_NAME=itid2
log_archive_dest_3           LOCATION=/oracle_asm/standby/itid1/arch_from_standbyredo VALID_FOR=(STANDBY_LOGFILE,
                             STANDBY_ROLE)

check standby的 log_archive_dest_n参数

SQL> select name,value from v$parameter where name like 'log_archive_dest_%' and name not like '%state%' and value is not null;

NAME                         VALUE
---------------------------- ------------------------------------------------------------------------------------
log_archive_dest_1           LOCATION=/oracle_asm/standby/itid2/arch
log_archive_dest_2           SERVICE=itid1 ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=itid1
log_archive_dest_3           LOCATION=/oracle_asm/standby/itid2/arch_from_standbyredo VALID_FOR=(STANDBY_LOGFILE,
                             STANDBY_ROLE)

查看primary的datafile 和 logfile convert设置

SQL> show parameter db_file_name_convert

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string      /oracle_asm/standby/itid2/data
                                                 file/itid, /oracle_asm/standby
                                                 /itid1/datafile/itid
SQL> show parameter log_file_name_convert

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_file_name_convert                string      /oracle_asm/standby/itid2/data
                                                 file/itid, /oracle_asm/standby
                                                 /itid1/datafile/itid

查看standby的datafile和 logfile convert 设置

SQL> show parameter db_file_name_convert

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string      /oracle_asm/standby/itid1/data
                                                 file/itid, /oracle_asm/standby
                                                 /itid2/datafile/itid
SQL> show parameter log_file_name_convert

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_file_name_convert                string      /oracle_asm/standby/itid1/data
                                                 file/itid, /oracle_asm/standby
                                                 /itid2/datafile/itid

check primary的 FAL设置

SQL> show parameter fal

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
fal_client                           string
fal_server                           string      itid2

check standby的 FAL 设置

SQL> show parameter fal

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
fal_client                           string
fal_server                           string      itid1

check primary的standby_file_management

SQL> show parameter STANDBY_FILE_MANAGEMENT

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
standby_file_management              string      AUTO

check standby的standby_file_management

SQL> show parameter STANDBY_FILE_MANAGEMENT

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
standby_file_management              string      AUTO

check primary是否可以进行转换

SQL> select switchover_status from v$database;

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

转换primary为standby

SQL> alter database commit to switchover to physical standby with session shutdown;

Database altered.

据说这一步会把control file 备份到当前session的trace。

check standby 可以转化成primary

SQL> select switchover_status from v$database;

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

要注意的是这一步必须是在primary ->  standby之后才有效否则的话返回的结果就是not allowed

turn standby to primary

SQL> alter database commit to switchover to primary with session shutdown;

Database altered.

open 新的primary database

SQL> select status from v$instance;

STATUS
------------
MOUNTED

SQL> alter database open;

Database altered.

在11gr2中turn standby to primary之后 新的primary是mount状态。

在新的standby上应用redo

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION
*
ERROR at line 1:
ORA-01665: control file is not a standby control file

这一步遇到了错误说不是standby control file

通过下列步骤可以fix

SQL> shutdown abort
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  502181888 bytes
Fixed Size                  1345912 bytes
Variable Size             385877640 bytes
Database Buffers          109051904 bytes
Redo Buffers                5906432 bytes
Database mounted.
SQL> alter database open read only
  2  ;

Database altered.

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

Database altered.

虽然我不知道为什么这样会fix。

check一下redo传输和应用的情况

primary端的日志archive情况如下

SQL> select NAME,SEQUENCE#, FIRST_TIME, NEXT_TIME FROM V$ARCHIVED_LOG  where sequence#>104 ORDER BY SEQUENCE#;

NAME                                                     SEQUENCE# FIRST_TIM NEXT_TIME
------------------------------------------------------- ---------- --------- ---------
/oracle_asm/standby/itid2/arch/1_105_840039496.dbf             105 12-MAR-14 12-MAR-14
itid1                                                          105 12-MAR-14 12-MAR-14
/oracle_asm/standby/itid2/arch/1_106_840039496.dbf             106 12-MAR-14 12-MAR-14
itid1                                                          106 12-MAR-14 12-MAR-14

standby端日志apply如下

SQL> SELECT NAME,SEQUENCE#,APPLIED FROM V$ARCHIVED_LOG WHERE sequence#>100 ORDER BY SEQUENCE#;

NAME                                                                              SEQUENCE# APPLIED
-------------------------------------------------------------------------------- ---------- ---------
itid2                                                                                   101 YES
/oracle_asm/standby/itid1/arch/1_101_840039496.dbf                                      101 YES
itid2                                                                                   102 NO
/oracle_asm/standby/itid1/arch/1_102_840039496.dbf                                      102 YES
/oracle_asm/standby/itid1/arch/1_103_840039496.dbf                                      103 YES
itid2                                                                                   103 NO
/oracle_asm/standby/itid1/arch/1_104_840039496.dbf                                      104 YES
/oracle_asm/standby/itid1/arch/1_105_840039496.dbf                                      105 YES
/oracle_asm/standby/itid1/arch/1_106_840039496.dbf                                      106 NO
/oracle_asm/standby/itid1/arch_from_standbyredo/1_106_840039496.dbf                     106 IN-MEMORY