Stop connecting as SID

Question

Below are example of two entries in my listner alert log file(log.xml). which is having CONNECT_DATA with "Service_Name" and CONNECT_DATA with "SID".
For SID i made changes in "listener.ora" file.
For Service Name i made changes in "tnsnames.ora" file.
i want to ask you just for my information ,
Is it possible to make connection with only Service name. I.E. CONNECT_DATA with "Service_Name"
or can we stop connection via SID?????????????
Thanks for your great reply.
my
</msg>
<msg time='2009-04-16T10:55:23.946+10:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='*******'
host_addr='**.*.***.**'>
<txt>16-APR-2009 10:55:23 * (CONNECT_DATA=(SERVICE_NAME=*****)(CID=(PROGRAM=C:\WINNT\System32\inetsrv\inetinfo.exe)(HOST=ADMINWOTIF1B)(USER=***_admin))) * (ADDRESS=(PROTOCOL=tcp)(HOST=**.*.***.**)(PORT=****)) * establish * &&&& * 0
</txt>
<msg time='2009-04-16T10:57:29.125+10:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='******'
host_addr='**.*.***.**'>
<txt>16-APR-2009 10:57:29 * (CONNECT_DATA=(SID=******)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=**.*.***.*)(PORT=******)) * establish * &&&&&* 0
</txt>
Here is listner.ora file content:--
SID_LIST_LISTENER_10g =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/10.1.0/db_2)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = ****)
(ORACLE_HOME = /u01/app/oracle/product/10.1.0/db_2)
LISTENER_10g =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = *****)(PORT = ***))
TRACE_LEVEL_LISTENER_10g=admin
TRACE_DIRECTORY_LISTENER_10g=/u01/app/oracle/product/10.1.0/db_2/network/log
TRACE_FILE_LISTENER_10g=listener10g.trc
TRACE_TIMESTAMP_LISTENER_10g=true
SUBSCRIBE_FOR_NODE_DOWN_EVENT_LISTENER=OFF
and here is "tnsname.ora" file content:
******* =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ******)(PORT = ***))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = *****)
****_** =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = *****)(PORT = **))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ******)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)

Answer 1

Prashant,
Yes you can create a service and configure your tnsnames.ora and connect SERVICE name to connect to your database.
Here is example
OLTP =
  (DESCRIPTION =
    (LOAD_BALANCE = ON)
    (FAILOVER = ON)
    (ADDRESS = (PROTOCOL = TCP)(HOST = server01)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = server02)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = server03)(PORT = 1521))
    (CONNECT_DATA =
      (SERVICE_NAME = OLTP_SERVICE)
      (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
        (RETRIES = 20)
        (DELAY = 1)
BATCH =
  (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = server01)(PORT = 1521))
       (CONNECT_DATA =
      (SERVICE_NAME = BATCH_SERVICE)
  )