ORA-12514 : Kindly Advice. Urgent

Hi All,
I have two databases. DB_A and DB_B.
DB_A has a synonym say SYN_A. The base table for the SYN_A is a view that is present in DB_B database. The synonym SYN_A is created using DB Link DBLink_B.WORLD.
The problem is when i am firing the below mentioned query from backend (logging into UNIX and then sqlplus '/ as sysdba' ) i am gettingt IRA-12514 error
SQL> select count(*) fromSYN_A;
select count(*) from SYN_A                     *
ERROR at line 1:
ORA-12514: TNS:listener could not resolve SERVICE_NAME given in connect
descriptorNo operation is possible on the synonyms. Even a simple select sysdate from dual@DBLink_B.world is gving the same error.
The DB Link and Synonyms are valid from dba_objects.
But when i am connecting to my PL/SQL developer, all the above queries are running fine.
DB_A is 9.2.0.6.0 and DB_B is 10.2.0.3.0
Why such a thing is happening. Am i missing something.
Kindly help me out.
Regards,

Hi,
1) DDL for the Synonym is as below
OWNER                          SYNONYM_NAME
TABLE_OWNER                    TABLE_NAME
DB_LINK
PUBLIC                         SYN_A
MARK                           EMP_VW
DBLink_B.World
2) DDL for the view is as below
OWNER                          OBJECT_NAME   OBJECT_TYPE    STATUS
MARK                              EMP_VW         VIEW        VALID
3) AND 4) Yes right. The TNSNAMES.ora of DB_A box doesnt contain any entry for DB_B.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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