Hello DBAs:

I have a so weird situation on my laptop. Hope someone
can help me figure it out.

I have Oracle 8.1.7 on my local C drive with 2
database installed. I also have 8.0.5 client on my
local D drive (I still enjoy 805's interface).  They
were working fine until a week ago. Then my 817
started to have problems. First I can't connect from
8.1.7 to any network database, then I find out 817
can't connect to any of my local databases either.
(error message: "ORA-12154: TNS: could not resolve
service name)
However, until today, I still can use 805 to connect
both network and local databases. I have tried all the
actions that oracle docs refereed. Here are the info:
In 8.1.7 
-- TNSNAMES.ORA:
MCI =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST =
127.0.0.1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = MCI)
    )
  )
-- SQLNET.ORA:
NO DEFAULT_DOMAIN entry

In 8.0.5
-- TNSNAMES.ORA:
MCI.WORLD =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT
= 1521))
    (CONNECT_DATA = (SID = MCI))
  )
-- SQLNET.ORA: 
names.default_domain = world

Can someone tell me what's wrong with 817?

Thanks for any advice!


Wendy


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