正確理解tnsnames.ora中的service_name

正確理解tnsnames.ora中的service_name

正解：tnsnames.ora中的service_name 其實應該是監聽程式監聽到

Services Summary...

Service "PLSExtProc" has 1 instance(s).

Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Service "test.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

Service "testXDB.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

Service "test_XPT.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

The command completed successfully

場景回憶

檢視service_names,db_domain

SQL> show parameter service_names

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

service_names string test

SQL> show parameter db_domain

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

db_domain string test.doudou.com

tnsping 通，可以ping通

[ora@dg-ss dbs]$ tnsping test

TNS Ping Utility for Linux: Version 10.2.0.4.0 - Production on 08-AUG-2008 17:23:19

Used parameter files:

/opt/oracle/product/10.2.0/db_2/network/admin/sqlnet.ora

Used TNSNAMES adapter to resolve the alias

Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = dg-ss)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = test)))

OK (0 msec)

使用者登入確報錯 ORA-12514

[ora@dg-ss dbs]$ sqlplus doudou/123@test

SQL*Plus: Release 10.2.0.4.0 - Production on Fri Aug 8 17:23:23 2008

ERROR:

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

descriptor

檢視監聽程式狀態

[ora@dg-ss dbs]$ lsnrctl status

LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 08-AUG-2008 17:22:00

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dg-ss)(PORT=1521)))

STATUS of the LISTENER

------------------------

Alias LISTENER

Version TNSLSNR for Linux: Version 10.2.0.4.0 - Production

Start Date 08-AUG-2008 17:21:35

Uptime 0 days 0 hr. 0 min. 24 sec

Trace Level off

Security ON: Local OS Authentication

SNMP OFF

Listener Parameter File /opt/oracle/product/10.2.0/db_2/network/admin/listener.ora

Listener Log File /opt/oracle/product/10.2.0/db_2/network/log/listener.log

Listening Endpoints Summary...

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dg-ss)(PORT=1521)))

(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Service "test.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

Service "testXDB.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

Service "test_XPT.test.doudou.com" has 1 instance(s).

Instance "test", status READY, has 1 handler(s) for this service...

The command completed successfully

檢視tnsnames.ora檔案

[ora@dg-ss admin]$ cat tnsnames.ora

TEST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = dg-ss)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = test)

)

解決方法

TEST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = dg-ss)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = test.test.doudou.com)

)

使用者可以正常登入

[ora@dg-ss admin]$ sqlplus doudou/123@test

SQL*Plus: Release 10.2.0.4.0 - Production on Fri Aug 8 17:24:14 2008

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>

總結：

通過這次簡單的錯誤，讓我意識到研究oracle不能人云亦云，必須通過實驗才能研究的更深，更明瞭。

最後提醒自己一次tnsnames.ora中的service_name是監聽程式監聽到的service_name也可以認為是servcie_name=db_name.db_domain

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正確理解tnsnames.ora中的service_name

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