Service使用referred和avileable固定session连接到一台数据库服务器上，这台数据库服务器宕机后会切换到另一台数据库服务器上
管理员管理的DB里，service分为：
- preferred instance：服务启动的时候，在哪个实例上启动，该实例就是preferred instance。
- available instance：服务所在的实例崩溃，集群件会在另外一个available instance里启动该服务。
必须在oracle用户下执行
[root@node1 ~]# srvctl add service -d orcl -s srv1 -r orcl1 -a orcl2
PRCD-1026 : Failed to create service srv1 for database orcl
PRKH-1014 : Current user "root" is not the oracle owner user "oracle" of oracle home "/u01/app/oracle/product/11.2.0/dbhome_1"
[oracle@node1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 24-AUG- 19:56:25
Copyright (c) 1991, , Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
VersionTNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 24-AUG- 19:19:59
Uptime0 days 0 hr. 36 min. 49 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File/u01/app/grid/diag/tnslsnr/node1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.20)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.22)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@node2 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 24-AUG- 19:55:48
Copyright (c) 1991, , Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
VersionTNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 24-AUG- 19:24:29
Uptime0 days 0 hr. 31 min. 29 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File/u01/app/grid/diag/tnslsnr/node2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.24)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.23)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
The command completed successfully
添加一个service：srv1，orcl1是prefer，orcl2是available：
srvctl add service -d orcl -s srv1 -r orcl1 -a orcl2
srvctl start service -d orcl -s srv1
[oracle@node1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 24-AUG- 20:09:06
Copyright (c) 1991, , Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
VersionTNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 24-AUG- 19:19:59
Uptime0 days 0 hr. 49 min. 12 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File/u01/app/grid/diag/tnslsnr/node1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.20)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.22)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "srv1" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@node2 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 24-AUG- 20:09:10
Copyright (c) 1991, , Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
VersionTNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 24-AUG- 19:24:29
Uptime0 days 0 hr. 44 min. 44 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File/u01/app/grid/diag/tnslsnr/node2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.24)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.23)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
The command completed successfully
异常关闭orcl1，再过一会，会看到srv1在orcl2上启动了。
[root@node1 ~]# crsctl stop crs
[oracle@node2 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 24-AUG- 21:11:40
Copyright (c) 1991, , Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
VersionTNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 24-AUG- 19:24:29
Uptime0 days 1 hr. 47 min. 28 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File/u01/app/grid/diag/tnslsnr/node2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.24)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.92.23)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
Service "srv1" has 1 instance(s).
Instance "orcl2", status READY, has 1 handler(s) for this service...
The command completed successfully
可以为服务添加多个preferred实例，这样可以不需要available实例：
srvctl add service -d orcl -s srv2 -r orcl1,orcl2
srvctl start service -d orcl -s srv2
[oracle@node1 ~]$ srvctl status service -d orcl -s srv2
Service srv2 is running on instance(s) orcl1,orcl2
service可以只定义preferred实例，而不定义available实例。但是这样就没有HA了。
这样当service所在的实例崩溃以后，该service不会failover到另外一个实例上去。
把srv1从orcl1上运行，转移到orcl2上运行：
srvctl relocate service -d orcl -s srv1 -i orcl1 -t orcl2
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