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
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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 "<pre class="brush:php;toolbar:false;"ferred_list>" [-a "<available_list>"] [-P <TAF_policy>]
-d <name> Unique name for the database
-s <service> Service name
-r "<pre class="brush:php;toolbar:false;"f_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 
