Virag said...LISTENERS_db01g =
(ADDRESS = (PROTOCOL = TCP)(HOST = server01-v)(PORT = 1526))
(ADDRESS = (PROTOCOL = TCP)(HOST = server02-v)(PORT = 1526))
The LISTENER_db10g entries are referenced by the SID.LOCAL_LISTENER and SID.REMOTE_LISTENER parameters in the spfile.
LISTENER_db10g is not there in your tnsnames.ora
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