A query that has run for a long time has suddenly started hanging.  The query
joins 3 tables - 2 of them across a link.  The query runs on an RDBMS 8.0.5 NT.
The  tables across the link are on AIX RDBMS 7.3.2.3.  All indexes are VALID.

When I connect to the  NT and run the query by hand it also hangs.  But I can
join the NT table to each of the AIX tables and get instant results - I just
cannot join all three.

When I do a describe across the link I get "ORA-12663-Services required by the
client not available on the server."  

Any ideas for further troubleshooting?

..tom


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