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