一些name的连接 学习总结

主要实现下，oracle中instance_name ,db_name等对连接的关系（动态监听）

我们查看监听

[[email protected] ~]$ lsnrctl status lsnr2

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 17-NOV-2014 19:59:47

Copyright (c) 1991, 2011, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
STATUS of the LISTENER
------------------------
Alias lsnr2
Version TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 17-NOV-2014 19:53:45
Uptime 0 days 0 hr. 6 min. 2 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /app/oracle/product/11g/db_1/network/admin/listener.ora
Listener Log File /app/oracle/product/11g/db_1/log/diag/tnslsnr/localhost/lsnr2/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc1)))
Services Summary...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

可以看到监听中的serice是orcl，则在你的tns中的配置中的

132test=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.23.132)(PORT = 1522))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

这样一些客户端能连接上。

1.当我们修改db_domain

SQL> alter system set db_domain=‘xxx‘ scope= spfile;
System altered.

　　需要重启数据库。

在执行lsnrctl status ，会发现，现在的service name为

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
STATUS of the LISTENER
------------------------
Alias                     lsnr2
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                17-NOV-2014 19:53:45
Uptime                    0 days 0 hr. 13 min. 36 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /app/oracle/product/11g/db_1/network/admin/listener.ora
Listener Log File         /app/oracle/product/11g/db_1/log/diag/tnslsnr/localhost/lsnr2/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc1)))
Services Summary...
Service "orcl.xxx" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB.xxx" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

　　发现server 为 "orcl.xxx" ，此时的oracle 客户端连接工具，如pl/sql 等工具将连接不上。需要重新配置TNS。

2.如果修改service_names,则情况如下，一个实例下的数据库能对应多个服务

先将原来设置的db_domain 还原

SQL> alter system reset db_domain;
System altered.

重启

SQL> show parameter db_domain
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_domain                            string

修改service_names

SQL> alter system set service_names=app1,app2;

System altered.

SQL> show parameter service

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
service_names                        string      APP1, APP2

　　在查看监听内容，发现

Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc1)))
Services Summary...
Service "APP1" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "APP2" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

　　此时，我这里使用PL/SQL 可以看到连个都能连上

tns如下

132testapp1=
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.23.132)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = APP1)
    )
  )
132testapp2=
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.23.132)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = APP2)
    )
  )

3.db_name是写入到文件头里面的，一般不能修改

4.db_unique_name

SQL> alter system set db_unique_name=‘aaaa‘ scope=spfile;

System altered.

　　重启，观察lsnrctl

Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc1)))
Services Summary...
Service "APP1" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "APP2" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "aaaa" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

　 这样的实验我们可以看书使用tns连接的时候，oracle的一些配置对于tns连接的。可以去排错。