ORA-12535错误: TNS:operation timed out

如果Oracle资料库和client端连线有经过firewall，在MTS模式下连线的设定可能需要特别注意，因为就算你防火墙开通了1521 port，但是在MTS下listener会把连线要求redirect给dispatcher，而dispatcher的port又是random port，这时候你可以选择client端改用Dedicated 连线，或者修改dispatcher设定来达成正常连结，而不会出现ORA-12535: TNS:operation timed out。

1)client端改用Dedicated mode

DD =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.1)(PORT = 1521))

)

(CONNECT_DATA =

(SID = DD)

(SERVER = DEDICATED)

)

)

2)修改dispatcher固定使用port number

# vi initSID.ora

*.dispatchers="(address=(protocol=tcp)(port=5000))(dispatchers=3)"

# restart instance

# SQL> select name,network from v$dispatcher

NAME NETWORK

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

D000 (ADDRESS=(PROTOCOL=tcp)(HOST=ora1)(PORT=5000))

D001 (address=(protocol=tcp)(port=5000))

D002 (address=(protocol=tcp)(port=5000))

# netstat -al |grep 5000

tcp 0 0 *:5000 *:* LISTEN

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