10gRAC使用service实现taf

service作为oracle数据库中的关键概念之一，利用得当，可以方便数据库的管理，提高数据库的执行效率。 通过service，oracle可以实现server side taf，简化对客户端的维护量，下面我们看一下在10g rac 怎样实验service实现 serve side taf 使用dbca来配置taf

service作为oracle数据库中的关键概念之一，利用得当，可以方便数据库的管理，提高数据库的执行效率。

通过service，oracle可以实现server side taf，简化对客户端的维护量，下面我们看一下在10g rac 怎样实验service实现 serve side taf

使用dbca来配置taf

通过dbca可以非常方便的配置server side taf

至此，service配置完成，下面我们验证一下

[root@node1 ~]# su - oracle
[oracle@node1 ~]$ lsnrctl status

LSNRCTL for Linux: Version 10.2.0.5.0 - Production on 05-AUG-2014 21:46:10

Copyright (c) 1991, 2010, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER_NODE1
Version                   TNSLSNR for Linux: Version 10.2.0.5.0 - Production
Start Date                05-AUG-2014 21:26:40
Uptime                    0 days 0 hr. 19 min. 30 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/11.2.0/db/network/log/listener_node1.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.100.131)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.100.31)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "+ASM_XPT" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "racdb" has 3 instance(s).
  Instance "racdb", status UNKNOWN, has 1 handler(s) for this service...
  Instance "racdb1", status READY, has 2 handler(s) for this service...
  Instance "racdb2", status READY, has 1 handler(s) for this service...
Service "racdbXDB" has 2 instance(s).
  Instance "racdb1", status READY, has 1 handler(s) for this service...
  Instance "racdb2", status READY, has 1 handler(s) for this service...
Service "racdb_XPT" has 2 instance(s).
  Instance "racdb1", status READY, has 2 handler(s) for this service...
  Instance "racdb2", status READY, has 1 handler(s) for this service...
Service "service1" has 1 instance(s).
  Instance "racdb1", status READY, has 2 handler(s) for this service...
The command completed successfully
[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Aug 5 21:46:23 2014

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> show parameter service

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
service_names			     string	 service1
SQL> col name for a20
SQL> col failover_method for a20
SQL> col failover_type for a20
SQL>  select name,failover_method,failover_type from dba_services;

NAME		     FAILOVER_METHOD	  FAILOVER_TYPE
-------------------- -------------------- --------------------
SYS$BACKGROUND
SYS$USERS
seeddataXDB
seeddata.regress.rdb
ms.dev.us.oracle.com

racdbXDB
racdb
service1

7 rows selected.

SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

[oracle@node1 ~]$ srvctl config service -d racdb -s service1 -a
service1 PREF: racdb1 AVAIL: racdb2 TAF: basic
[oracle@node1 ~]$ srvctl config service -d racdb
service1 PREF: racdb1 AVAIL: racdb2

从上面的结果可以看出，通过dbca配置service 的taf，会在ocr中存储taf配置信息（仅仅是taf method），在数据库参数文件中会添加service条目，并且在数据字典中添加相应记录，但是数据字典中的taf信息是空的，需要另外添加，如

SQL> begin
  2  dbms_service.modify_service(
  3  service_name=>'service1',
  4  failover_method=>dbms_service.failover_method_basic,
  5  failover_type => dbms_service.failover_type_select,
  6  failover_retries => 180,
  7  failover_delay => 5 
  8  );
  9  end;
 10  /

PL/SQL procedure successfully completed.

SQL> col name for a20
SQL> col failover_method for a20
SQL> col failover_type for a20
SQL> select name,failover_method,failover_type from dba_services;

NAME		     FAILOVER_METHOD	  FAILOVER_TYPE
-------------------- -------------------- --------------------
SYS$BACKGROUND
SYS$USERS
seeddataXDB
seeddata.regress.rdb
ms.dev.us.oracle.com

racdbXDB
racdb
service1	     BASIC		  SELECT

7 rows selected.

另外，也可以使用srvctl来添加service

[root@node1 ~]# srvctl add service -h
Usage: srvctl add service -d <name> -s <service_name> -r "<preferred_list>" [-a "<available_list>"] [-P <TAF_policy>]
    -d <name>           Unique name for the database
    -s <service>        Service name
    -r "<pref_list>"    List of preferred instances
    -a "<avail_list>"   List of available instances
    -P <TAF_policy>     TAF policy (NONE, BASIC, or PRECONNECT)
Usage: srvctl add service -d <name> -s <service_name> -u {-r "<new_pref_inst>" | -a "<new_avail_inst>"}
    -d <name>           Unique name for the database
    -s <service>        Service name
    -u                  Add a new instance to service configuration
    -r <new_pref_inst>  Name of new preferred instance
    -a <new_avail_inst> Name of new available instance
    -h                  Print usage
[root@node1 ~]# srvctl add service -d racdb -s service2 -r racdb1 -a racdb2 -P BASIC
PRKH-1014 : Current user root is not the same as oracle owner oracle of oracle home /u01/app/oracle/product/11.2.0/db.
[root@node1 ~]# su - oracle
[oracle@node1 ~]$ srvctl add service -d racdb -s service2 -r racdb1 -a racdb2 -P BASIC
[oracle@node1 ~]$ srvctl config service -d racdb -a
service1 PREF: racdb1 AVAIL: racdb2 TAF: basic
service2 PREF: racdb1 AVAIL: racdb2 TAF: BASIC
[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Aug 5 22:16:43 2014

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> show parameter service

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
service_names			     string	 service1, racdb
SQL> select name from dba_services;

NAME
----------------------------------------------------------------
SYS$BACKGROUND
SYS$USERS
seeddataXDB
seeddata.regress.rdbms.dev.us.oracle.com
racdbXDB
racdb
service1

7 rows selected.

从这里，可以看出通过srvct添加的service不会在数据库参数和数据字典中添加相应的信息