Listener Startup or Connections Hang in 11g
(Doc ID 803838.1)
Last updated on FEBRUARY 20, 2019
Applies to:Oracle Net Services - Version 18.104.22.168 to 22.214.171.124 [Release 11.1 to 12.1]
HP-UX PA-RISC (64-bit)
Beginning with Oracle RDBMS release 11g, the listener functionality bypasses the /etc/hosts file when resolving hostnames to IPs and instead query the DNS server.
This can introduce some delay in establishing a connection to a remote host compared with 10g.
SQL*Plus and tnsping show this behavior but this delay can appear also when opening a dblink or anytime TCP connections are established by the Oracle Network layer.
This happens even if Name Server Switch configuration (nsswitch) specifies the hosts file prior to dns lookups:
Nothing was changed in the configuration of the OS, only the upgrade from Oracle 10g to 11g was done.
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