在11.2中，TNSNAMES.ORA中的配置新增了TRANSPORT_CONNECT_TIMEOUT参数。

有的时候配置TNSNAMES.ORA出错在所难免，而等待超时失败的时候十分痛苦，这一分钟的TCP超时会显得很漫长，尤其是WINDOWS环境下的SQLPLUSW工具，在这一分种内完全没有任何的响应。

现在11.2允许用户配置TNSNAMES.ORA的时候指定TRANSPORT_CONNECT_TIMEOUT参数，用来指定TCP超时的等待时间。

注意，配置这个参数要求11.2的客户端：

[oracle@bjtest admin]$ more tnsnames.oraITPUB个人空间9I J,V4Z nh!XB

TEST =ITPUB个人空间3d)b9M5k y5Q[2P

(DESCRIPTION =ITPUB个人空间7cA!m'f\6o_ V

(ADDRESS_LIST =ITPUB个人空间1N'jz)mf"{ y"j

(ADDRESS = (PROTOCOL = TCP)(HOST = 172.26.3.23)(PORT = 1521))ITPUB个人空间H#j)sQP

)

Dvjh*{9266282    (CONNECT_DATA =ITPUB个人空间a$U;L b7g DV

(SERVICE_NAME = TESTA)

q-x?#vjt1\ v$m1G)D9266282      (SERVER = DEDICATED)

!ou o~^#s9266282    )

%Z:a2y7s*e ~!y+kb$i9266282  )

TEST112_SHARE =ITPUB个人空间/L,sik8~v!q#{v*]

(DESCRIPTION =

I M^/SG5a|)JZ-xC M9266282    (ADDRESS_LIST =ITPUB个人空间0x\'t@:qOS8M X

(ADDRESS = (PROTOCOL = TCP)(HOST = 172.25.198.230)(PORT = 1521))ITPUB个人空间5FC!p$n dU8] MFp

)

4JK0ql5V$\ kP:e@K9266282    (CONNECT_DATA =ITPUB个人空间4q/]jJ|u@n

(SERVICE_NAME = TEST112XDB)ITPUB个人空间I7U#{ R c!nEl

(SERVER = SHARED)

{*_!l(W\v)h9266282    )

[*P-DOpJ;_9266282  )

下面通过11.2的sqlplus连接配置的TEST服务名：

[oracle@bjtest ~]$ sqlplus /nolog

SQL*Plus: Release11.2.0.1.0 Production on星期三5月5 06:29:59 2010

Copyright (c) 1982, 2009, .  All rights reserved.

SQL> set time onITPUB个人空间@9VBXAg

06:30:07 SQL> conn test/test@testITPUB个人空间pE"h!z^ |r8j\4G#r

ERROR:ITPUB个人空间wdW,l*I*v ^/bT

ORA-12170: TNS:连接超时

y8Hc)I,~ Z%S4g926628206:31:14 SQL>

很明显连接超时需要等待一分钟的时间。

同样通过tnsping命令也可以看到相似的结果：

[oracle@bjtest admin]$ tnsping test

TNS Ping Utility for Linux: Version11.2.0.1.0 - Production on 05-5月-2010 06:30:44

Copyright (c) 1997, 2009, Oracle.  All rights reserved.

已使用的参数文件:

ITPUB个人空间(Z6\ ei'O%c:I已使用TNSNAMES适配器来解析别名ITPUB个人空间1s;NQ8h Okx0pSM6a尝试连接(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 172.26.3.23)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = TESTA) (SERVER = DEDICATED)))ITPUB个人空间X-c]mgz;r]k

TNS-12535: TNS:操作超时|#U%KLNKj6Pk9266282[oracle@bjtest admin]$ dateITPUB个人空间}gIq/Jc3s

Wed May  5 06:31:48 CST 2010

下面修改TEST服务名的配置，添加TRANSPORT_CONNECT_TIMEOUT参数：

[oracle@bjtest admin]$ vi tnsnames.ora

TEST =ITPUB个人空间.W[5Rs2^ j

(DESCRIPTION =

D'b]7fF%k9266282    (TRANSPORT_CONNECT_TIMEOUT = 5)ITPUB个人空间0`-J-dX3T;T

(ADDRESS_LIST =ITPUB个人空间D"WQ1MOPU

(ADDRESS = (PROTOCOL = TCP)(HOST = 172.26.3.23)(PORT = 1521))

-R!J*HIxMq:e9266282    )

'K/}N:EOLK9266282    (CONNECT_DATA =ITPUB个人空间8r;h `;d#bTMB

(SERVICE_NAME = TESTA)

p8| \Q4Ch9266282      (SERVER = DEDICATED)

s1u+? UCN/t6y9266282    )ITPUB个人空间{ns+Uv t2|.k

)

TEST112_SHARE =ITPUB个人空间K CVkcQk H

(DESCRIPTION =

}4xC}$g,o{x;m9266282    (ADDRESS_LIST =ITPUB个人空间1lzr` ] _ n

(ADDRESS = (PROTOCOL = TCP)(HOST = 172.25.198.230)(PORT = 1521))

H/eO5D7{Av[9266282    )

to*TyL4Y3Md7m9266282    (CONNECT_DATA =ITPUB个人空间q(jqP;I+BE$v

(SERVICE_NAME = TEST112XDB)ITPUB个人空间;M6m}$^T]'GJ.I

(SERVER = SHARED)ITPUB个人空间5MmIP*EMFs9u

)

X"yX%p~'R9266282  )ITPUB个人空间!n#e`2X/s#r1} d

~ITPUB个人空间 s:W2?;t5\

"tnsnames.ora"53L,1086Cwritten

再次通过SQLPLUS连接：

06:32:52 SQL> conn test/test@testITPUB个人空间'Dj*TZG_ u(n{

ERROR:

uP E%ix)Qq9G9266282ORA-12170: TNS:连接超时

ITPUB个人空间!x4| ]K+H

06:33:05 SQL>

这次很短的时间很就超时报错并返回结果了。

执行tnsping的结果观察的更明显一些：

[oracle@bjtest admin]$ tnsping test

TNS Ping Utility for Linux: Version11.2.0.1.0 - Production on 05-5月-2010 06:33:16

Copyright (c) 1997, 2009, Oracle.  All rights reserved.

已使用的参数文件:

ITPUB个人空间/S/E(O@c|Jzh已使用TNSNAMES适配器来解析别名ITPUB个人空间&l;T k3[D,Y尝试连接(DESCRIPTION = (TRANSPORT_CONNECT_TIMEOUT = 5) (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 172.26.3.23)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = TESTA) (SERVER = DEDICATED)))ITPUB个人空间3M vkA+zG#o

TNS-12535: TNS:操作超时ITPUB个人空间(| N#@#Rkf1i

[oracle@bjtest admin]$ dateITPUB个人空间eOT0R6~UeU#~*S?

Wed May  5 06:33:24 CST 2010