Oracle 10g dataguard维护，配置自动fast_start switchover

环境：

os：rhel6.3_64bit

DB:Oracle10gR2

    总是感觉对他越来越是朦胧，算是对搞了几天dataguard发一些感慨吧，下一步研究Oracle 11gdataguard的一些特征，期待着早些把dataguard从10g到12c弄明白跟大家一块分享，好了不多说了还是来研究下10gR2的dataguard的fast-start failover吧！

————————————————————broker配置保护级别————————————————————

protect-mode     redo-transport      standby-redo-log-files-needs   used with fast-start failover

MAXPROTECTION       SYNC             Yes                No
MAXAVAILABILITY      SYNC             Yes                Yes
MAXPERFORMANC      ASYNC/ARCH           Yes for ASYNC                    No

配置 standby
DGMGRL> show database verbose 'ora'

Database
  Name:            ora
  Role:            PHYSICAL STANDBY
  Enabled:         YES
  Intended State:  ONLINE
  Instance(s):
    ora

  Properties:
    InitialConnectIdentifier        = 'ora'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    Dependency                      = ''
    DelayMins                       = '0'
    Binding                         = 'OPTIONAL'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '180'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'auto'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '3'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = '/opt/oracle/product/oradata/stdy, /opt/oracle/product/oradata/ora'
    LogFileNameConvert              = '/opt/oracle/product/oradata/stdy, /opt/oracle/product/oradata/ora'
    FastStartFailoverTarget         = ''
    StatusReport                    = '(monitor)'
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    HostName                        = 'eagle'
    SidName                         = 'ora'
    LocalListenerAddress            = '(ADDRESS=(PROTOCOL=TCP)(HOST=eagle)(PORT=15321))'
    StandbyArchiveLocation          = 'dgsby_ora'
    AlternateLocation               = ''
    LogArchiveTrace                 = '0'
    LogArchiveFormat                = '%t_%s_%r.dbf'
    LatestLog                       = '(monitor)'
    TopWaitEvents                   = '(monitor)'

Current status for "ora":
SUCCESS

DGMGRL> edit database 'ora'  SET PROPERTY 'LogXptMode'='SYNC';
Property "LogXptMode" updated
DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MAXAVAILABILITY;
Succeeded.
检查保护级别

DATABASE_ROLE    INSTANCE                       OPEN_MODE  PROTECTION_MODE      PROTECTION_LEVEL     SWITCHOVER_STATUS
---------------- ------------------------------ ---------- -------------------- -------------------- --------------------
PHYSICAL STANDBY ora                            MOUNTED    MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY SESSIONS ACTIVE

检查数据库配置是否有错误
DGMGRL> show database 'ora' 'statusreport'
STATUS REPORT
       INSTANCE_NAME   SEVERITY ERROR_TEXT
查看日志模式
DGMGRL>  show database 'ora' 'LogXptMode'
  LogXptMode = 'SYNC'
 
 
 
————————————————————配置 fast-start failover————————————————————————
dataguard的保护模式为MaxAvailability
启动闪回数据库
主库备库LogXptMode='SYNC';

备库闪回
SQL>  select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
NO

SQL>  alter database flashback on;
 alter database flashback on
*
ERROR at line 1:
ORA-38706: Cannot turn on FLASHBACK DATABASE logging.
ORA-38709: Recovery Area is not enabled.

SQL>  alter system set db_recovery_file_dest_size=2g scope=both;

System altered.

SQL> alter system set db_recovery_file_dest='/opt/oracle/ora_arch' scope=both;

System altered.

SQL>  alter database flashback on;
 alter database flashback on
*
ERROR at line 1:
ORA-01153: an incompatible media recovery is active

SQL>  select process,pid,status,client_process from v$managed_standby;

PROCESS   STATUS          THREAD#  SEQUENCE#     BLOCK#     BLOCKS
--------- ------------ ---------- ---------- ---------- ----------
ARCH      CLOSING               1         23          1        436
ARCH      CLOSING               1         22          1         20
ARCH      CLOSING               1         21       8193         98
RFS       IDLE                  0          0          0          0
RFS       IDLE                  0          0          0          0
MRP0      APPLYING_LOG          1         24         81     102400
RFS       IDLE                  1         24         82          1

14 rows selected.

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> SQL>  alter database flashback on;

Database altered.

SQL>  select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
YES

SQL>  alter database recover managed standby database disconnect from session;

Database altered

主库闪回
SQL>  select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
NO

SQL>  alter system set db_recovery_file_dest_size=2g scope=both;

System altered.

SQL> show parameter recover

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string
db_recovery_file_dest_size           big integer 2G
recovery_parallelism                 integer     0
SQL> alter system set db_recovery_file_dest='/opt/oracle/stdy_arch' scope=both;

System altered.

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              92276688 bytes
Database Buffers          113246208 bytes
Redo Buffers                6291456 bytes
Database mounted.
SQL> alter database flashback on;

Database altered.

SQL> ALTER database open;
ALTER database open
*
ERROR at line 1:
ORA-01531: a database already open by the instance

SQL> select instance_name,status from v$instance;

INSTANCE_NAME    STATUS
---------------- ------------
stdy           OPEN

DGMGRL> edit database 'ora' set property faststartfailovertarget='stdy';
Property "faststartfailovertarget" updated
DGMGRL> edit database 'stdy' set property faststartfailovertarget='ora';
Property "faststartfailovertarget" updated
DGMGRL>  EDIT CONFIGURATION SET PROPERTY FastStartFailoverThreshold = 45
> ;
Property "faststartfailoverthreshold" updated
DGMGRL> ENABLE FAST_START FAILOVER;

DGMGRL> show database 'ora' 'LogXptMode';
  LogXptMode = 'sync'
DGMGRL> show database 'stdy' 'logxptmode';
  LogXptMode = 'sync'
DGMGRL> show  configuration verbose

Configuration
  Name:                dg_config
  Enabled:             YES
  Protection Mode:     MaxAvailability
  Fast-Start Failover: DISABLED
  Databases:
    ora  - Physical standby database
    stdy - Primary database

Current status for "dg_config":
SUCCESS

DGMGRL> show configuration verbose

Configuration
  Name:                dg_config
  Enabled:             YES
  Protection Mode:     MaxAvailability
  Fast-Start Failover: ENABLED
  Databases:
    ora  - Physical standby database
         - Fast-Start Failover target
    stdy - Primary database

Fast-Start Failover
  Threshold:           45 seconds
  Observer:            eagle
  Shutdown Primary:    TRUE

Current status for "dg_config":
SUCCESS

DGMGRL> start OBSERVER;
Observer started
启动后会一直监控整个dataguard的状态，可以通过任何一个client连上执行stop OBSERVER后停止监控。

 

 

日志在alert日志一级目录下面的droracle_sid.log

[show fast_start failover]

查看归档终点是否有异常:
col dest_name for a30
col error for a20
select dest_name,status,target,archiver,error,process from v$archive_dest;

启动broker:
DGMGRL> connect sys/oracle@ora

创建中介配置:
DGMGRL> create configuration 'testBroker' as primary database is 'ora' connect identifier is 78;

在中介配置中添加备用数据库:
DGMGRL> add database 'aux1' as connect identifier is 250 maintained as physical;

查看broker配置状态:
DGMGRL> show configuration verbose;

查看主从数据库的配置:
DGMGRL> show database verbose 数据库唯一名;
DGMGRL> show database verbose 数据库唯一名;

确认主从数据库属性为LogXptMode='sync' :
DGMGRL> edit database ora set property LogXptMode = 'sync';

启动broker配置:
DGMGRL> enable configuration;

修改快速故障转移的延迟时间(默认为30秒，有些少!):
DGMGRL> edit configuration set property FastStartFailoverThreshold=120;

启动快速故障转移:
DGMGRL> ENABLE FAST_START FAILOVER;

启动Observer监视器:
DGMGRL> start observer;

启动之后，该前台进程不会退出，会一直挂在这。 直到从其他窗口关闭!

在新的窗口再启动一个dgmgrl,查看快速转移配置:
DGMGRL> show configuration verbose;
DGMGRL> show database verbose 数据库唯一名;
DGMGRL> show database verbose 数据库唯一名;

在数据库中查看快速转移状态:
ora@ SYS> col FS_FAILOVER_OBSERVER_HOST for a20
ora@ SYS> select fs_failover_observer_present,fs_failover_observer_host,fs_failover_threshold from v$database;

FS_FAIL FS_FAILOVER_OBSERVER FS_FAILOVER_THRESHOLD
------- -------------------- ---------------------
YES     alvin                                    0

aux1@ SYS> col FS_FAILOVER_OBSERVER_HOST for a20
aux1@ SYS> select fs_failover_observer_present,fs_failover_observer_host,fs_failover_threshold from v$database;

FS_FAIL FS_FAILOVER_OBSERVER FS_FAILOVER_THRESHOLD
------- -------------------- ---------------------
YES     alvin                                   45