11g rac中的listener.ora和tnsnames.ora问题

qhd2004

最近安装一个11g rac学习环境，安装时参考文档：http://www.oracle.com/technetwork/cn/articles/hunter-rac11gr2-iscsi-083834-zhs.html

安装后发现listener.ora和tnsnames.ora内容相对10g rac变动很大，我把listener.ora和tnsnames.ora内容放下面，请问，安装后默认就是这样吗？
为什么用scan的地址呢？

环境如下：
os：Red Hat Enterprise Linux Server release 5.4 (Tikanga)
db：[oracle@syk2 admin]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on Tue Jun 19 10:43:06 2012

[oracle@syk2 admin]$ more tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
SYKDB =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = syk-scan)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = sykdb)
    )
  )


[grid@syk1 admin]$ more listener.ora
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER))))            # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1))))                # line
added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON                # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON              # line added by Agent
[grid@syk1 admin]$

hcn

可以参看maclean的该文章

http://www.askmaclean.com/archives/11gr2-rac-add-listener-static-register.html