问题：一台机器同时装两套数据库时（实例名o8161,o8151)，无法同时启动两个listener，

当启动第二个listener时，显示错误。

$ lsnrctl start

LSNRCTL for IBM/AIX RISC System/6000: Version 8.1.5.0.0 - Production on 14-SEP-00 09:25:17

(c) Copyright 1998 Oracle Corporation. All rights reserved.

TNS-01106: Listener using listener name LISTENER has already been started

$ oerr tns 1106

01106, 00000, "Listener using listener name %s has already been started"

// *Cause: Another listener is already listening on one of the ADDRESSes

// specified.

// *Action: Shutdown the previous listener specified by the listener name

// before starting this one.

问题产生原因：

两个实例的LISTENER.ORA中IPC协议的KEY是相同，而一个系统中KEY必须是唯一的.

解决办法：

修改key的值即可。修改后的文件信息：

o8161实例：（没有修改)

# LISTENER.ORA Configuration File:/oracle/dbs/opstemp/szpcac1/network/admin/listener.ora

# Generated by Oracle configuration tools.

LISTENER =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))

)

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = loopback)(PORT = 1521))

)

)

(DESCRIPTION =

(PROTOCOL_STACK =

(PRESENTATION = GIOP)

(SESSION = RAW)

)

(ADDRESS = (PROTOCOL = TCP)(HOST = loopback)(PORT = 2481))

)

)

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = PLSExtProc)

(ORACLE_HOME = /oracle)

(PROGRAM = extproc)

)

(SID_DESC =

(ORACLE_HOME = /oracle)

(SID_NAME = o8161)

)

)

08151实例：（经过修改)

# LISTENER.ORA Configuration File:/ora815/network/admin/listener.ora

# Generated by Oracle Net8 Assistant

LISTENER =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = IPC)(KEY = TESTo815))

)

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = loopback)(PORT = 1526))

)

)

)

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = ora8151)

(ORACLE_HOME = /ora815)

(PROGRAM = extproc)

)

)