no servers/no listener,and scan_listener

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#RAC #no servers #oracle11g #no listener

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本文提供了解决Oracle RAC环境中noservers/nolistener问题的方法，包括检查环境变量、验证监听数据库监听IP和端口、调整listener.ora和tnsnames.ora配置、修改scan_listener端口及配置远程监听。通过实施这些步骤，可以有效解决noservers/nolistener问题。

ORACLE 11G RAC环境：

no servers/no listener, and scan_listener modify.

no servers and no listener 的问题大多都和 local_listener 参数有关系，就是当前节点监听的IP和端口

首先查看监听日志根据监听日志找问题/u01/app/grid/diag/tnslsnr/rac01/listener/alert/log.xml

如果找不到问题所在

一：.检查环境变量 cat /home/oracle/.bash_profile cat /home/grid/.bash_profil

二：.检查监听数据库监听IP和端口：

grid和oracle用户登入数据库查看：
show parameter local_l
select instance_name,status from v$instance;

如果发现监听IP或端口不对
用以下命令：

(grid是单独的，但是oracle更改如果不加scop的话，所有节点都会更改，所有oracle的需要指定节点，建议grid和oracle都要指定)
local_listener都是public的vip

grid:（节点一）
alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL= TCP)(HOST=10.10.11.27)(PORT=1521))))' scope=both sid='+ASM1';
oracle:
alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL= TCP)(HOST=10.10.11.27)(PORT=1521))))' scope=both sid='racdb1';

grid:（节点二）
alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL= TCP)(HOST=10.10.11.47)(PORT=1521))))' scope=both sid='+ASM2';
oracle:
alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL= TCP)(HOST=10.10.11.47)(PORT=1521))))' scope=both sid='racdb2';

三：.检查grid家目录：listener.ora ，oracle家目录：tnsnames.ora的配置

RAC中建议使用动态注册，所有节点listener.ora信息都一样，tnsnames.ora如下

PS：监听IP都是本地public的vip ， tnsname.ora数据库IP 最好用scan IP ###实现负载均衡，故障转移等功能。

listener.ora:

LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1))))                # line added by Agent
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER))))            # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON              # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON                # line added by Agent

tnsname.ora:

# tnsnames.ora Network Configuration File: /u01/app/oracle/product/11.2.0.3/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

RACDB =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac-scan)(PORT = 1521))        ###ps:连接数据库用scan ip
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = racdb)
    )
)

ASM =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.11.27)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (ORACLE_SID = +ASM1)
    )
)

RMAN =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = bask_server)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rman)
    )
)

四：.关于scan_listener
srvctl modify scan_listener -p 1521 修改scan的端口
srvctl status scan_listener
srvctl config scan_listener
srvctl start scan_listener

alter system set remote_listener='rac-scan:1521'; 数据库中修改远程监听
alter system set remote_listener='';

srvctl stop listener

srvctl stop scan_listener

srvctl start listener

srvctl start scan_listener