Database link question

Hello,
I have 4 databases now,
2 databases are Oracle 7.3 and the other 2 are Oracle 8.0.3. Lately I tried to create database link between 4 databases and had some problems:
My connect strings are:
ora180: Oracle 7.3.3 on NT4.0
ora200: Oracle 7.3.2 on Netware4.10
ora26 and ora23: Oracle 8.0.3 on NT4.0
With SQL*Plus,I can connect to the 4 databases normally and do any SQL satements.

1.I connect with ora200 and create a db_link named ora180.world.

   Then do the select statement:
   select * from dba_users_at_ora180;
   It works properly.
2.I connect with ora200 and create a db_link named ora23.world

   Do : select * from dbs_users_at_ora23;
   But response:
   ORA-12154: TNS could not resolve service name; 3.I connect with ora26 and create a db_link named ora23.world

   Do : select * from dbs_users_at_ora23;
   But response:
   ORA-02085: database link ORA23.world connects to ORACLE.world 4.I connect with ora26 and create a db_link named ora200.world

   Do : select * from dbs_users_at_ora200;    But response:
   ORA-02019: connection description for remote database not found.

Only the first db_link between Oracle7 to Oracle7 works. Could you help me for these error messages? Thank you so much.

Violin.
violin.hsiao_at_mail.pouchen.com.tw Received on Tue Oct 13 1998 - 21:06:00 CDT