First of all, there was a 12505 error the day before yesterday. I checked it on the Internet and soon solved it. The solution :Oracle_12505 error solution
Today again meet a problem, a habit, online method, found at sixes and sevens, then, to service the block at, oracle sqldeveloper connection need to start listening, I found my listening has not started, then manually start the monitor, to practice again, even, also can go under the DOS startup, entering DOS, direct input:
LSNRCTL start can start
LSNRCTL stop stop service
LSNRCTL status to check the status
In addition, I have changed the location of the configuration file (in the link above)
listener. Ora
# listener.ora Network Configuration File: E:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = E:\app\Administrator\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:E:\app\Administrator\product\11.2.0\dbhome_1\bin\oraclr11.dll")
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Administrator)(PORT = 1521))
)
)
ADR_BASE_LISTENER = E:\app\Administrator
tnsnames.ora
# tnsnames.ora Network Configuration File: E:\app\Administrator\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = Administrator)(PORT = 1521))
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)