How can I know a database link target DB is dead?

Hi,
I have a question about using database link.
If I create a public database link linkB from DB A to DB B. Then the DB B's storage fail and DB B is dead.
When I use select * from tableB@linkB in one package with exception handler, it just hang and didn't jump to exception. How can I set a timeout value (like 15 secs) to this database link ??? or is there any method to detect the database link if alive then run the sql statement????
Anyone knows??? thanks!!
Regards,
Miki.

Thanks to NKU's answer.
But, the inbond_connect_timeout seems to set in DB server, for a client to connect with the database server and provide the necessary authentication information.
In my case, I don't know the target DB B is dead and my AP hang because it execute a query through DB link from DB A to DB B.
If I can set a timeout value to DB link (create in DB A) or something else, I can have exception handler to process it not just wait a long time period. ^_^
Best Regards,
Miki.

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