Detect break off DB connection

Hi
I am using Labview 7.1, LabSQl and MySQL.
Is there a way to detect the break off in the database connection in the event case while my program is performing other tests?
Clement

Normal operation procedure is to open and close the connection every time
you communicate with the database. If you work like that, you will get an
error if it is not possible to establish a connection. In any case, you'll
receive an error if the connection is broken, and you can act on that, for
instance by popping up a message, logging the error, or storing the failed
query in a buffer to retry later.
Regards,
Wiebe.

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ORA-12518 Tns: Listener could not hand off client conenction
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ORA-12518: TNS:listener could not hand off client connection

guys,
i have a problem here with the connection between a client host and a server database, using a new non-default listener LISTENER_BKP_1. The error showed is:
ORA-12518: TNS:listener could not hand off client connection
i had learned about this error here before, and i toke some notes as follows:
h2. listener.log
TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-SEP-2009 01:23:49
Copyright (c) 1991, 2005, Oracle. All rights reserved.
System parameter file is C:\oracle\product\10.2.0\db_2\network\admin\listener.ora
Log messages written to C:\oracle\product\10.2.0\db_2\network\log\listener_bkp_1.log
Trace information written to C:\oracle\product\10.2.0\db_2\network\trace\listener_bkp_1.trc
Trace level is currently 0
Started with pid=2212
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=WINXP)(PORT=1523)))
Listener completed notification to CRS on start
TIMESTAMP * CONNECT DATA [* PROTOCOL INFO] * EVENT [* SID] * RETURN CODE
25-SEP-2009 01:24:39 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=PAULO))(COMMAND=services)(ARGUMENTS=64)(SERVICE=listener_bkp_1)(VERSION=169869568)) * services * 0
25-SEP-2009 01:24:49 * (CONNECT_DATA=(SERVICE_NAME=financeira.winxp)(CID=(PROGRAM=C:\ORACLE?instantclient_10_2\sqlplus.exe)(HOST=PAULO_NOTEBOOK)(USER=ORACLE_DBA))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.100)(PORT=51649)) * establish * financeira.winxp * 12518
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
32-bit Windows Error: 2: No such file or directory
25-SEP-2009 01:24:53 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=PAULO))(COMMAND=services)(ARGUMENTS=64)(SERVICE=listener_bkp_1)(VERSION=169869568)) * services * 0
h2. lsnrctl services
C:\>lsnrctl services listener_bkp_1
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-SEP-2009 01:33:40
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=WINXP)(PORT=1523)))
Services Summary...
Service "FINANCEIRA.WINXP" has 1 instance(s).
Instance "FINANCEI", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:1
LOCAL SERVER
The command completed successfully
h2. listener.ora file
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = FINANCEIRA.WINXP)
(SID_NAME = FINANCEI)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = WINXP)(PORT = 1521))
SID_LIST_LISTENER_BKP_1 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = FINANCEIRA.WINXP)
(SID_NAME = FINANCEI)
LISTENER_BKP_1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = WINXP)(PORT = 1523))
h2. v$resource_limit
RESOURCE_NAME ; CURRENT_UTILIZATION ; MAX_UTILIZATION ; INITIAL_ALLOCATION ; LIMIT_VALUE
processes ; 26 ; 30 ; 150; 150
sessions ; 30 ; 35 ; 170 ; 170
2 rows selected
this means that it didn't reach the resource limites yet. What i can do to solve the problem ???
another important information is that connecting by the default listener LISTENER instead of the LISTENER_BKP_1 listener, the connection is completed successfully. There's enough SGA memory space too.
Tks,

Paulo_BR wrote:
i have a problem here with the connection between a client host and a server database, using a new non-default listener LISTENER_BKP_1. The error showed is:
ORA-12518: TNS:listener could not hand off client connectionDon't do Oracle on Windows, so I'm not sure how the following relates to the Listener dealing with a dedicated server connection request on Linux/Unix.
On Linux/Unix, a dedicated server request means just that - a dedicated process has to be started to service that client. The Listener does it by using the parameters of the configured listener.ora service to execute +$ORACLE_HOME/bin/oracle+. This process then starts up, and the Listener hands off the client connection for this process for servicing.
If there is a failure somewhere on this series of steps fail, the Listener throws the ORA-12518 exception. For example, the +$ORACLE_HOME+ has been incorrectly configured in listener.ora and it fails to execute and startup a dedicated server process.
And this relates to the underlying error you are seeing:
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
32-bit Windows Error: 2: No such file or directoryI think that the Listener on Windows uses the CreateRemoteThread() Win32 call to start up the server process thread. However, it needs a valid process identifier (of the existing Oracle instance) for this call - and thus needs to first identify the Oracle instance process. Could be that this step uses a ORACLE_HOME reference. And if that directory path is not valid, it is unable to identify the process id of the Oracle instance and thus unable to spawn a dedicated thread to service that client.

ORA-12518: TNS:listener could not hand off client connection (DBD ERROR: OCIServerAttach)

Hi again,
I'm on my enterprise management console and Database Instance and Listener shows the green arrow, but the Agent Connection to Instance shows a red downward arrow and the error:
Status: Failed
Details: ORA-12518: TNS:listener could not hand off client connection (DBD ERROR: OCIServerAttach)
My OraClrAgnt service is up and running (using winxp pro, oracle 11gR2), I'm on my home pc, all my ports are open (my machine's name is "abigail" and it is dmzhost)
Any suggestions to resolve this error?
My Tnsnames ora:
ABIGAIL =
(DESCRIPTION =
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    (CONNECT_DATA =
      (SERVICE_NAME = orcl.0.0.10)
LISTENER_ORCL =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ABIGAIL)(PORT = 1521))
    (CONNECT_DATA =
      (SID = ORCL)
RMAN =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = ABIGAIL)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rman.abigail)
My listener.ora
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = E:\app\abigail\product\11.2.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:E:\app\abigail\product\11.2.0\dbhome_1\bin\oraclr11.dll")
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = ABIGAIL)(PORT = 1521))
ADR_BASE_LISTENER = E:\app\abigail
My SQLNET.ORA
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (EZCONNECT, TNSNAMES, LOCALHOST)
NAMES.TRACE_LEVEL = ADMIN
My alert file
<msg time='2013-10-10T20:47:02.687-04:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='ABIGAIL'
host_addr='::1'>
<txt>10-OCT-2013 20:47:01 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=SYSTEM))(SERVICE_NAME=orcl.0.0.10)) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=38289)) * establish * orcl.0.0.10 * 12518
</txt>
</msg>
<msg time='2013-10-10T20:47:02.687-04:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='ABIGAIL'
host_addr='::1'>
<txt>TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
</txt>
</msg>
My listener status and services
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date                10-OCT-2013 22:47:58
Uptime                    0 days 0 hr. 2 min. 1 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   E:\app\abigail\product\11.2.0\dbhome_1\network\admin\l
istener.ora
Listener Log File         e:\app\abigail\diag\tnslsnr\ABIGAIL\listener\ale
rt\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl.0.0.10" has 1 instance(s).
Instance "orcl", status READY, has 8 handler(s) for this service...
The command completed successfully
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
Service "orcl.0.0.10" has 1 instance(s).
Instance "orcl", status READY, has 8 handler(s) for this service...
    Handler(s):
      "D006" established:0 refused:0 current:0 max:800 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 1312>
         (ADDRESS=(PROTOCOL=tcps)(HOST=ABIGAIL)(PORT=1060))
      "D005" established:0 refused:12 current:0 max:800 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 1288>
         (ADDRESS=(PROTOCOL=tcps)(HOST=ABIGAIL)(PORT=1061))
      "D004" established:0 refused:1 current:1 max:16383 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 1260>
         (ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1063))
      "D003" established:0 refused:1 current:1 max:16383 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 1140>
         (ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1062))
      "D002" established:0 refused:1 current:1 max:16383 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 140>
         (ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1059))
      "D001" established:0 refused:1 current:1 max:16383 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 1072>
         (ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1057))
      "D000" established:0 refused:1 current:1 max:16383 state:ready
         DISPATCHER <machine: ABIGAIL, pid: 748>
         (ADDRESS=(PROTOCOL=tcp)(HOST=ABIGAIL)(PORT=1058))
      "DEDICATED" established:0 refused:0 state:ready
         LOCAL SERVER
The command completed successfully

I added this on my listener.ora
DIRECT_HANDOFF_TTC_LISTENER=OFF
Works now!
Moral of the story, google is ur friend lol. Thanks for the reply tho!

TNS:listener could not hand off client connection

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SID_LIST_LISTENER =
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Detect break off DB connection

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