ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Solution:
================
Your problem is solved after bellows two step


1. Regestration you Listener from Dynamically to static like below.

Make a listerner.ora for you database with your DB Information.


SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(ORACLE_HOME = H:\oracle\product\10.2.0\db_1)
(SID_NAME = orcl)
)
)

LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hp-bb88068f9f5d)(PORT = 1521))
)


then stop and start the listener.

The data within the SID_DESC section is written about instance is referred to as 'static information' for that instance.
Note : [all static information in the listener.ora is overwritten when the instance is dynamically registered with the listener.]




2. increase PROCESSES parameter in the initSID.ora file or in spfile like

see your alert_log file first.

SQL> alter system set processes = 400 scope=spfile;

reboot the database.