Oracle 11gr2如何修改RAC集群的scan ip并处理ORA-12514问题

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1.查看scan ip的状态信息

grid@cwgsdb1:~$ srvctl config scanSCAN name: rac-scanip, Network: 1/100.100.100.0/255.255.255.0/ipmp0SCAN VIP name: scan1, IP: /rac-scanip/100.100.100.219

2.停止scan_listener ，scan

grid@cwgsdb1:~$ srvctl stop scan_listenergrid@cwgsdb1:~$ srvctl stop scan

3.确认 scan_listener,scan 的状态

grid@cwgsdb1:~$ srvctl status scan_listenerSCAN Listener LISTENER_SCAN1 is enabledSCAN listener LISTENER_SCAN1 is not runninggrid@cwgsdb1:~$ srvctl status scanSCAN VIP scan1 is enabledSCAN VIP scan1 is not runninggrid@cwgsdb1:~$ crs_stat -t | grep scanora.scan1.vip  ora....ip.type OFFLINE   OFFLINE               grid@cwgsdb1:~$ crs_stat -t | grep lsnrora....ER.lsnr ora....er.type ONLINE    ONLINE    cwgsdb1     ora....N1.lsnr ora....er.type OFFLINE   OFFLINE               ora....B1.lsnr application    ONLINE    ONLINE    cwgsdb1     ora....B2.lsnr application    ONLINE    ONLINE    cwgsdb2

4.在所有节点中 /etc/hosts 文件中修改 scan 对应的ip

root@cwgsdb1:~$ cat /etc/hosts## Copyright 2009 Sun Microsystems, Inc.  All rights reserved.# Use is subject to license terms.## Internet host table#::1 cwgsdb1 localhost 100.100.100.215 cwgsdb1 localhost loghost 100.100.100.216 cwgsdb2100.100.100.217 cwgsdb1-vip100.100.100.218 cwgsdb2-vip1.1.1.1 cwgsdb1-priv1.1.1.2 cwgsdb2-priv 100.100.100.219 rac-scaniproot@cwgsdb1:~$ vi /etc/hostsroot@cwgsdb1:~$ cat /etc/hosts## Copyright 2009 Sun Microsystems, Inc.  All rights reserved.# Use is subject to license terms.## Internet host table#::1 cwgsdb1 localhost 100.100.100.215 cwgsdb1 localhost loghost 100.100.100.216 cwgsdb2100.100.100.217 cwgsdb1-vip100.100.100.218 cwgsdb2-vip1.1.1.1 cwgsdb1-priv1.1.1.2 cwgsdb2-priv 100.100.100.103 rac-scanip

5.查看srvctl命令所在文件夹

grid@cwgsdb1:~$ cd $ORACLE_HOMEgrid@cwgsdb1:/u01/app/11.2.0/grid$ cd bin/grid@cwgsdb1:/u01/app/11.2.0/grid/bin$ pwd/u01/app/11.2.0/grid/bin

6.使用root命令修改scan-ip，即修改为/etc/hosts里面scan-ip对应的ip

root@cwgsdb1:/u01/app/oracle/product/11.2.0/dbhome_1/bin# cd /u01/app/11.2.0/grid/binroot@cwgsdb1:/u01/app/11.2.0/grid/bin# ./srvctl modify scan -n rac-scaniproot@cwgsdb1:/u01/app/11.2.0/grid/bin# ./srvctl config scanSCAN name: rac-scanip, Network: 1/100.100.100.0/255.255.255.0/ipmp0SCAN VIP name: scan1, IP: /rac-scanip/100.100.100.103

注：-n后面跟的是/etc/hosts下scan的名称

7.启动scan_listener，scan并查看状态

root@cwgsdb1:/u01/app/11.2.0/grid/bin# su - gridOracle Corporation      SunOS 5.11      11.3    September 2015grid@cwgsdb1:~$ srvctl status scanSCAN VIP scan1 is enabledSCAN VIP scan1 is not runninggrid@cwgsdb1:~$ srvctl start scan_listenergrid@cwgsdb1:~$ srvctl start scanPRCC-1014 : scan1 was already runningPRCR-1004 : Resource ora.scan1.vip is already runningPRCR-1079 : Failed to start resource ora.scan1.vipCRS-5702: Resource 'ora.scan1.vip' is already running on 'cwgsdb2' grid@cwgsdb1:~$ srvctl status scanSCAN VIP scan1 is enabledSCAN VIP scan1 is running on node cwgsdb2grid@cwgsdb1:~$ srvctl status scan_listenerSCAN Listener LISTENER_SCAN1 is enabledSCAN listener LISTENER_SCAN1 is running on node cwgsdb2grid@cwgsdb1:~$ srvctl config scanSCAN name: rac-scanip, Network: 1/100.100.100.0/255.255.255.0/ipmp0SCAN VIP name: scan1, IP: /rac-scanip/100.100.100.103

8.使用新的scan ip测试连接

提示ORA-12514 TNS:listener does not currently know of service requested in connect descriptor

使用关键字"scan ip ORA-12514"在MOS上查找解决方案

Top Issues That Cause Troubles with SCAN VIP and Listeners (文档 ID 1373350.1)

Issue #5: Service not getting registered with SCAN listener after failover of the SCAN listener

After SCAN VIP and SCAN listener failover, instance does not register with the SCAN listener. It might happen for only 1 of the scan listener. Client connection gets intermittent ORA-12514 TNS:listener does not currently know of service requested in connect descriptor.

Causes:

1. Unpublished Bug 12659561 after scan listener failover, database instance might not register to the scan listener (refer Note 12659561.8), fixed in 11.2.0.3.2, merge patch 13354057 for 11.2.0.2 available for certain platform.
2. Unpublished Bug 13066936 Instance does not register services when scan fails over (refer Note 13066936.8)
Solutions:

1) For both above bugs, the workaround is to unregister and register remote listener on the database instance which does not register to a SCAN listener with following steps.
show parameter remote_listener
alter system set remote_listener='';
alter system register;
alter system set remote_listener=':';
alter system register;

2) Other points to check if service is not registered with SCAN listener:
a. remote_listener and local_listener is defined correctly
b. EZCONNECT is defined in sqlnet.ora, eg: NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
c. SCAN name with 3 IPs should NOT be defined in /etc/hosts, it should be defined in DNS
d. running nslookup multiple times should display SCAN VIP in round-robin fashion
e. do not set SECURE_REGISTER_ in listener.ora if the class of secure transports (COST) is not configured.

9.尝试重启各节点监听，但问题依然存在

oracle@cwgsdb2:~$ srvctl stop listener -n cwgsdb2oracle@cwgsdb2:~$ srvctl stop listener -n cwgsdb1oracle@cwgsdb2:~$ srvctl start listener -n cwgsdb1oracle@cwgsdb2:~$ srvctl start listener -n cwgsdb2

10.通过修改remote_listener参数并注册数据库解决该问题

SQL> show parameter remote; NAME                                 TYPE        VALUE------------------------------------ ----------- ------------------------------remote_dependencies_mode             string      TIMESTAMPremote_listener                      string      rac-scanip:1521remote_login_passwordfile            string      EXCLUSIVEremote_os_authent                    boolean     FALSEremote_os_roles                      boolean     FALSEresult_cache_remote_expiration       integer     0SQL> alter system set remote_listener=''; System altered. SQL> alter system register; System altered. SQL> alter system set remote_listener='rac-scanip:1521'; System altered.

经过验证，使用新的scan ip可以成功连接数据库。至此，scan ip修改完成。

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