Question

I have installed Oracle 12c server and client on the same laptop.

Previously it was running, but now I started getting this error ORA-12541: no listener.

My listener service is up and running, and I can connect through SQL Developer, but I get that error when I try to connect through SQL*Plus using system/Lab12345@lab.

C:\Users\hunai>lsnrctl status

LSNRCTL for 64-bit Windows: Version 12.1.0.1.0 - Production on 15-JUN-2017 12:57:07
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))

STATUS of the LISTENER
------------------------
>Alias                     LISTENER
Version                   TNSLSNR for 64-bit Windows: Version 12.1.0.1.0 - Production
Start Date                15-JUN-2017 12:38:45
Uptime                    0 days 0 hr. 18 min. 23 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   C:\app\hunai\product\12.1.0\dbhome\network\admin\listener.ora
Listener Log File         C:\app\hunai\diag\tnslsnr\DESKTOP-0RL2PU2\listener\alert\log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=DESKTOP-0RL2PU2)(PORT=5500))(Security=(my_wallet_directory=C:\APP\HUNAI\admin\lab\xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "lab" has 1 instance(s).
  Instance "lab", status READY, has 1 handler(s) for this service...
Service "labXDB" has 1 instance(s).
  Instance "lab", status READY, has 1 handler(s) for this service...
The command completed successfully

This is my tnsnames.ora file:

# tnsnames.ora Network Configuration File: C:\app\hunai\product\12.1.0\dbhome\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

LAB =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = lab)
    )
  )

LISTENER_LAB =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

Kindly tell me how to resolve this issue.

Answer 1

Try to check if listener works:

lsnrctl status

in command line.

If it not works, try to start it:

lsnrctl start

ora 12541: no listener oracle 12c

1 个答案: