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) ) )