Communication between TNS_Listener and the listener of the Apex

Hi all
I how communication between TNS Listener, receiver of the Apex and Apex? For some reason, I got the following error of Apex listener:
Caused by: oracle.dbtools.rt.web.WebException: Unable to start the Universal Connection Pool: oracle.ucp.UniversalConnectionPoolException: Cannot get Connection from Datasource
.
.
.
Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
I truncated messages Java object.

This has happened when I tried to connect to the Apex. So I can fix it by going to:
http://localhost:8080/apex/listenerConfigure
then everything worked fine.

My listener.ora file:
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = firefly.snowdrop.com)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = /usr/local/oracle

ADR_BASE_ORACLE_LISTENER = /usr/local/oracle
My tnsnames.ora file
INARA =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = firefly.snowdrop.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = inara.snowdrop.com)
   )
  )
When inara is the name of the instance and the firefly is the host name.

Is that the order of start if first the TNS Listener or listener Apex matter first?

Best regards
Val

Published by: Valerie good-natured August 1, 2011 05:47

Hi Val,

My tnsnames.ora is configured for an existing server and there is no client configurations like sqlplus, sql or earpiece of the apex developer. However until now the server can connect to customers without problem (I just discover that unreproducible error on 'impossible to find the SID' sometimes occurs at the beginning of the Summit, the kick-off and can be solved by waiting for a while to connect to reconnect), so again I must modify the .ora?

No, if your database listener is configured properly (i.e., he listens to the SID that you try to connect to the network interface/hostname/ip address /... she must use), there is no need to make any other configuration, especially not on another machine.

-Udo

Tags: Database

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