DB Link working method and security issue.

Hi All,
I need some clarification how db link works.
If I am having DB link and done some DML operations. After that I have done some DML opearation on the local database. I haven't commited the data yet. Then DB Link goes down. What will happen?
In my case from local database if i am issuing
select * from emp@iasdb
then it shows updated data.
If i am connecting to target database then it shows non updated data. How it is possible?
What happen when DB Link goes down? Which database (taget / local) will keep lock of tables / rows I am updating?
Tom can you please help me.
Regards,
Pritesh.

If i am connecting to target database then it shows non updated data. How it is possible?Changes are visible only to the session doing the changes (until saved). Works even if the changes are across databases.
If remote DB goes down, this is what you get on local DB:
commit
ERROR at line 1:
ORA-02054: transaction 6.34.41922 in-doubt
ORA-02068: following severe error from REMOTE_DB
ORA-12152: TNS:unable to send break messageand if you now try to access the objects that were updated by above in-doubt transaction, you get this:
select * from t
ERROR at line 1:
ORA-01591: lock held by in-doubt distributed transaction 6.34.41922ORA-01591 lock held by in-doubt distributed transaction string
Cause: An attempt was made to access resource that is locked by a dead two-phase commit transaction that is in prepared state.
Action: The database administrator should query the PENDING_TRANS$ and related tables, and attempt to repair network connection(s) to coordinator and commit point. If timely repair is not possible, the database administrator should contact the database administrator at the commit point if known or the end user for correct outcome, or use heuristic default if given to issue a heuristic COMMIT or ABORT command to finalize the local portion of the distributed transaction.

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