It usually means something is not set up properly in your tnsnames.ora file which is used to keep information about the database you are connecting to.
Entries in this file typically look like:
STATS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =...
Terry,
I agree with the reply from Bob Lowell - (8i DBA Handbook, and 8i Complete Reference) are essential.
I would add a very good book on Tuning from Oracle Press and TUSC:
Oracle Performance Tuning Tips & Techniques
Oracle Press, Paperback, Published March 1999, 894 pages, orcle_prf_tng...
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