Listener - Two Services for Each Instance

Oracle 11r2g was installed on a Linux SO. Everything is working, but when I check the Listener Services I got this status:
lsnrctl services
Service "S060" has 1 instance(s).
Instance "S060", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:86 refused:0
LOCAL SERVER
Service "S060.domain" has 1 instance(s).
Instance "S060", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1289 refused:0 state:ready
LOCAL SERVER
There are Two Services for Each Instance. Is it normal or do I have to check anything else?
Thanks in advance.

910492 wrote:
Oracle 11r2g was installed on a Linux SO. Everything is working, but when I check the Listener Services I got this status:
lsnrctl services
Service "S060" has 1 instance(s).
Instance "S060", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:86 refused:0
LOCAL SERVER
Service "S060.domain" has 1 instance(s).
Instance "S060", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1289 refused:0 state:ready
LOCAL SERVER
There are Two Services for Each Instance. Is it normal or do I have to check anything else?
Thanks in advance.Pretty normal. The "unknown" is the static registration coming from the SID_LIST entry in the listener.ora file. The "ready" is the dynamic registration from the db instance itself.

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