1，登錄報錯如下：
[oracle@oracle_yueworld admin]$ rlwrap sqlplus system/system51@st1 SQL*Plus: Release 11.2.0.1.0 Production on Thu Dec 3 16:33:26 2015 Copyright (c) 1982, 2009, Oracle. All rights reserved. ERROR: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor2，查看下lsnrctl狀態，看是否是lsnrctl監聽的問題
[oracle@oracle_yueworld admin]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 03-DEC-2015 17:03:07 Copyright (c) 1991, 2009, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.121.51)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production Start Date 03-DEC-2015 17:02:55 Uptime 0 days 0 hr. 0 min. 11 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora Listener Log File /oracle/app/oracle/diag/tnslsnr/oracle_yueworld/listener/alert/log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.121.51)(PORT=1521))) The listener supports no services The command completed successfully [oracle@oracle_yueworld admin]$ [oracle@oracle_yueworld admin]$ 從中可以看出監聽正常，但是The listener supports no services這個貌似是不識別service_name啊
原blog地址：http://blog.csdn.net/mchdba/article/details/50166153
，未經過運行，不得轉載
3，去查看下參數
SQL> show parameter name;
NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_file_name_convert string /oracle/app/oracle/oradata/pow erdes, /oracle/app/oracle/orad ata/orcl db_name string orcl db_unique_name string stunq global_names boolean FALSE instance_name string orcl lock_name_space string log_file_name_convert string service_names string stunq SQL> 看到db_name和db_unique_name以及service_names不一樣
4，解決方案
在listener.ora文件里面添加SID_LIST_LISTENER，如下所示：
作用：以下紅色的模塊是靜態注冊監聽服務，方便客戶端遠程連接該數據庫使用
[oracle@oracle_yueworld admin]$ more listener.ora
# listener.ora Network Configuration File: /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora # Generated by Oracle configuration tools. SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = stunq) (ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1) (SID_NAME = stunq) ) ) LISTENER = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.51)(PORT = 1521)) ) ADR_BASE_LISTENER = /oracle/app/oracle [oracle@oracle_yueworld admin]$ 再重啟lsnrctl服務:
[oracle@oracle_yueworld admin]$ lsnrctl start LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 03-DEC-2015 18:00:09 Copyright (c) 1991, 2009, Oracle. All rights reserved. Starting /oracle/app/oracle/product/11.2.0/dbhome_1/bin/tnslsnr: please wait... TNSLSNR for Linux: Version 11.2.0.1.0 - Production System parameter file is /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora Log messages written to /oracle/app/oracle/diag/tnslsnr/oracle_yueworld/listener/alert/log.xml Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.121.51)(PORT=1521))) Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.121.51)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production Start Date 03-DEC-2015 18:00:09 Uptime 0 days 0 hr. 0 min. 0 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora Listener Log File /oracle/app/oracle/diag/tnslsnr/oracle_yueworld/listener/alert/log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.121.51)(PORT=1521))) Services Summary... Service "stunq" has 1 instance(s). Instance "stunq", status UNKNOWN, has 1 handler(s) for this service... The command completed successfully [oracle@oracle_yueworld admin]$ 看到The listener supports no services錯誤已經沒有了，可以去試試登錄
5，再次登錄報錯
[oracle@oracle_yueworld admin]$ rlwrap sqlplus orclk/st141118@st1
SQL*Plus: Release 11.2.0.1.0 Production on Thu Dec 3 18:03:55 2015 Copyright (c) 1982, 2009, Oracle. All rights reserved. ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Linux-x86_64 Error: 2: No such file or directory Process ID: 0 Session ID: 0 Serial number: 0 Enter user-name: 6，去修改服務端和客戶端的配置文件
google了很多資料，大部分都說是listener.ora配置錯誤導致listener找不到你要請求的sid。這有兩種可能，一種是client端的tnsnames.ora中配置了錯誤的SID，一種是server端的listener.ora中配置錯了SID。仔細檢查，然后開始修改服務器listener.ora listener.ora，將SID_NAME修改成正確的instance_name為orcl
[oracle@oracle_yueworld admin]$ more listener.ora
# listener.ora Network Configuration File: /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora # Generated by Oracle configuration tools. SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = stunq) (ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1) (SID_NAME = orcl) ) ) #PS: 這里面的SID_NAME是oracle實例名，GLOBAL_DBNAME是全局的dbname，是db_unique_name LISTENER = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.51)(PORT = 1521)) ) ADR_BASE_LISTENER = /oracle/app/oracle [oracle@oracle_yueworld admin]$ 修改客戶端tnsnames.ora
[oracle@oracle_yueworld admin]$ vim tnsnames.ora # tnsnames.ora Network Configuration File: /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. st1 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.51)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = stunq) ) ) # PS：這里的service_name就是可以從執行 show parameter name;中顯示的service_names參數值。7，然后驗證登錄，成功了，如下所示：
[oracle@oracle_yueworld admin]$
[oracle@oracle_yueworld admin]$ rlwrap sqlplus orclk/st141118@st1
SQL*Plus: Release 11.2.0.1.0 Production on Thu Dec 3 19:43:10 2015 Copyright (c) 1982, 2009, Oracle. All rights reserved. Connected to: Oracle Database 11g Release 11.2.0.1.0 - 64bit Production SQL>