对oracle listener.ora配置文件的认识
listener.ora 是oracle服务器端的网络配置文件，oracle 根据它来配置监听服务。
listener.ora可配置多个监听器，每个监听器的文件组成是：
SID_LIST_ORCLLISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = d:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = testDB)
(ORACLE_HOME = d:\oracle\product\10.2.0\db_1)
(SID_NAME = testDB)
)
)
ORCLLISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 20100908-2130)(PORT = 1521))
)
即由2部分组成：
XXXLiSTENER=(DESCRIPTION=xxx):指定一个监听器所对应的服务器地址和端口号
SID_LIST_XXXLISTENER=((SID_LIST =xxx):指定XXXLISTENER所服务的数据库。即XXXLISTENER将对请求这些数据库(SID)的连接提供监听接待服务。
listener.ora可配置多个监听和多个监听对应数据库（SID）.
ORCLLISTENER所监听的数据库列表
SID_LIST_ORCLLISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = d:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = testDB)
(ORACLE_HOME = d:\oracle\product\10.2.0\db_1)
(SID_NAME = testDB)
)
)
LISTENER所监听的数据库
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = Oracle8)
(ORACLE_HOME = d:\oracle\product\10.2.0\db_1)
(SID_NAME = ORCLw)
)
)
ORCLLISTENER所对应的服务器
ORCLLISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 20100908-2130)(PORT = 1521))
)
LISTENER所对应的服务器
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 20100908-21301)(PORT = 1521))
)
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